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SubjectRe: [PATCH v3] driver core: Fix SYNC_STATE_ONLY device link implementation
On Fri, May 22, 2020 at 11:41 AM Michael Walle <michael@walle.cc> wrote:
>
> Am Mon, 18 May 2020 23:30:00 -0700
> schrieb Saravana Kannan <saravanak@google.com>:
>
> > When SYNC_STATE_ONLY support was added in commit 05ef983e0d65 ("driver
> > core: Add device link support for SYNC_STATE_ONLY flag"),
> > device_link_add() incorrectly skipped adding the new SYNC_STATE_ONLY
> > device link to the supplier's and consumer's "device link" list.
> >
> > This causes multiple issues:
> > - The device link is lost forever from driver core if the caller
> > didn't keep track of it (caller typically isn't expected to). This
> > is a memory leak.
> > - The device link is also never visible to any other code path after
> > device_link_add() returns.
> >
> > If we fix the "device link" list handling, that exposes a bunch of
> > issues.
> >
> > 1. The device link "status" state management code rightfully doesn't
> > handle the case where a DL_FLAG_MANAGED device link exists between a
> > supplier and consumer, but the consumer manages to probe successfully
> > before the supplier. The addition of DL_FLAG_SYNC_STATE_ONLY links
> > break this assumption. This causes device_links_driver_bound() to
> > throw a warning when this happens.
> >
> > Since DL_FLAG_SYNC_STATE_ONLY device links are mainly used for
> > creating proxy device links for child device dependencies and aren't
> > useful once the consumer device probes successfully, this patch just
> > deletes DL_FLAG_SYNC_STATE_ONLY device links once its consumer device
> > probes. This way, we avoid the warning, free up some memory and avoid
> > complicating the device links "status" state management code.
> >
> > 2. Creating a DL_FLAG_STATELESS device link between two devices that
> > already have a DL_FLAG_SYNC_STATE_ONLY device link will result in the
> > DL_FLAG_STATELESS flag not getting set correctly. This patch also
> > fixes this.
> >
> > Lastly, this patch also fixes minor whitespace issues.
>
> My board triggers the
> WARN_ON(link->status != DL_STATE_CONSUMER_PROBE);
>
> Full bootlog:
>
> [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd083]
> [ 0.000000] Linux version 5.7.0-rc6-next-20200522-00040-g43dd7a434139 (mw@apollo) (aarch64-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #800 SMP PREEMPT Fri May 22 20:33:03 CEST 2020
> [ 0.000000] Machine model: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier
> [ 0.000000] efi: UEFI not found.
> [ 0.000000] cma: Reserved 32 MiB at 0x00000000f9c00000
> [ 0.000000] NUMA: No NUMA configuration found
> [ 0.000000] NUMA: Faking a node at [mem 0x0000000080000000-0x00000020ffffffff]
> [ 0.000000] NUMA: NODE_DATA [mem 0x20ff7ff100-0x20ff800fff]
> [ 0.000000] Zone ranges:
> [ 0.000000] DMA [mem 0x0000000080000000-0x00000000bfffffff]
> [ 0.000000] DMA32 [mem 0x00000000c0000000-0x00000000ffffffff]
> [ 0.000000] Normal [mem 0x0000000100000000-0x00000020ffffffff]
> [ 0.000000] Movable zone start for each node
> [ 0.000000] Early memory node ranges
> [ 0.000000] node 0: [mem 0x0000000080000000-0x00000000fbdfffff]
> [ 0.000000] node 0: [mem 0x0000002080000000-0x00000020ffffffff]
> [ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x00000020ffffffff]
> [ 0.000000] On node 0 totalpages: 1031680
> [ 0.000000] DMA zone: 4096 pages used for memmap
> [ 0.000000] DMA zone: 0 pages reserved
> [ 0.000000] DMA zone: 262144 pages, LIFO batch:63
> [ 0.000000] DMA32 zone: 3832 pages used for memmap
> [ 0.000000] DMA32 zone: 245248 pages, LIFO batch:63
> [ 0.000000] Normal zone: 8192 pages used for memmap
> [ 0.000000] Normal zone: 524288 pages, LIFO batch:63
> [ 0.000000] percpu: Embedded 30 pages/cpu s82776 r8192 d31912 u122880
> [ 0.000000] pcpu-alloc: s82776 r8192 d31912 u122880 alloc=30*4096
> [ 0.000000] pcpu-alloc: [0] 0 [0] 1
> [ 0.000000] Detected PIPT I-cache on CPU0
> [ 0.000000] CPU features: detected: GIC system register CPU interface
> [ 0.000000] CPU features: detected: EL2 vector hardening
> [ 0.000000] ARM_SMCCC_ARCH_WORKAROUND_1 missing from firmware
> [ 0.000000] CPU features: detected: ARM errata 1165522, 1319367, or 1530923
> [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 1015560
> [ 0.000000] Policy zone: Normal
> [ 0.000000] Kernel command line: debug root=/dev/mmcblk1p2 rootwait
> [ 0.000000] Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes, linear)
> [ 0.000000] Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes, linear)
> [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
> [ 0.000000] software IO TLB: mapped [mem 0xbbfff000-0xbffff000] (64MB)
> [ 0.000000] Memory: 3929888K/4126720K available (9532K kernel code, 1116K rwdata, 3556K rodata, 3264K init, 400K bss, 164064K reserved, 32768K cma-reserved)
> [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
> [ 0.000000] ftrace: allocating 32623 entries in 128 pages
> [ 0.000000] ftrace: allocated 128 pages with 1 groups
> [ 0.000000] rcu: Preemptible hierarchical RCU implementation.
> [ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=2.
> [ 0.000000] Trampoline variant of Tasks RCU enabled.
> [ 0.000000] Rude variant of Tasks RCU enabled.
> [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
> [ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
> [ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
> [ 0.000000] GICv3: GIC: Using split EOI/Deactivate mode
> [ 0.000000] GICv3: 256 SPIs implemented
> [ 0.000000] GICv3: 0 Extended SPIs implemented
> [ 0.000000] GICv3: Distributor has no Range Selector support
> [ 0.000000] GICv3: 16 PPIs implemented
> [ 0.000000] GICv3: CPU0: found redistributor 0 region 0:0x0000000006040000
> [ 0.000000] ITS [mem 0x06020000-0x0603ffff]
> [ 0.000000] ITS@0x0000000006020000: allocated 65536 Devices @20fad80000 (flat, esz 8, psz 64K, shr 0)
> [ 0.000000] ITS: using cache flushing for cmd queue
> [ 0.000000] GICv3: using LPI property table @0x00000020fad30000
> [ 0.000000] GIC: using cache flushing for LPI property table
> [ 0.000000] GICv3: CPU0: using allocated LPI pending table @0x00000020fad40000
> [ 0.000000] random: get_random_bytes called from start_kernel+0x604/0x7cc with crng_init=0
> [ 0.000000] arch_timer: cp15 timer(s) running at 25.00MHz (phys).
> [ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x5c40939b5, max_idle_ns: 440795202646 ns
> [ 0.000002] sched_clock: 56 bits at 25MHz, resolution 40ns, wraps every 4398046511100ns
> [ 0.000109] Console: colour dummy device 80x25
> [ 0.000393] printk: console [tty0] enabled
> [ 0.000439] Calibrating delay loop (skipped), value calculated using timer frequency.. 50.00 BogoMIPS (lpj=100000)
> [ 0.000452] pid_max: default: 32768 minimum: 301
> [ 0.000501] LSM: Security Framework initializing
> [ 0.000553] Mount-cache hash table entries: 8192 (order: 4, 65536 bytes, linear)
> [ 0.000585] Mountpoint-cache hash table entries: 8192 (order: 4, 65536 bytes, linear)
> [ 0.001429] rcu: Hierarchical SRCU implementation.
> [ 0.001574] Platform MSI: gic-its@6020000 domain created
> [ 0.001649] PCI/MSI: /interrupt-controller@6000000/gic-its@6020000 domain created
> [ 0.001853] EFI services will not be available.
> [ 0.001951] smp: Bringing up secondary CPUs ...
> [ 0.002231] Detected PIPT I-cache on CPU1
> [ 0.002250] GICv3: CPU1: found redistributor 1 region 0:0x0000000006060000
> [ 0.002256] GICv3: CPU1: using allocated LPI pending table @0x00000020fad50000
> [ 0.002278] CPU1: Booted secondary processor 0x0000000001 [0x410fd083]
> [ 0.002328] smp: Brought up 1 node, 2 CPUs
> [ 0.002354] SMP: Total of 2 processors activated.
> [ 0.002362] CPU features: detected: 32-bit EL0 Support
> [ 0.002369] CPU features: detected: CRC32 instructions
> [ 0.010381] CPU: All CPU(s) started at EL2
> [ 0.010401] alternatives: patching kernel code
> [ 0.010994] devtmpfs: initialized
> [ 0.012904] KASLR disabled due to lack of seed
> [ 0.013071] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
> [ 0.013088] futex hash table entries: 512 (order: 3, 32768 bytes, linear)
> [ 0.013867] thermal_sys: Registered thermal governor 'step_wise'
> [ 0.013995] DMI not present or invalid.
> [ 0.014177] NET: Registered protocol family 16
> [ 0.015070] DMA: preallocated 4096 KiB GFP_KERNEL pool for atomic allocations
> [ 0.015787] DMA: preallocated 4096 KiB GFP_KERNEL|GFP_DMA pool for atomic allocations
> [ 0.016519] DMA: preallocated 4096 KiB GFP_KERNEL|GFP_DMA32 pool for atomic allocations
> [ 0.016555] audit: initializing netlink subsys (disabled)
> [ 0.016679] audit: type=2000 audit(0.016:1): state=initialized audit_enabled=0 res=1
> [ 0.016973] cpuidle: using governor menu
> [ 0.017044] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers.
> [ 0.017074] ASID allocator initialised with 65536 entries
> [ 0.017342] Serial: AMBA PL011 UART driver
> [ 0.023544] Machine: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier
> [ 0.023558] SoC family: QorIQ LS1028A
> [ 0.023564] SoC ID: svr:0x870b0110, Revision: 1.0
> [ 0.026581] HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages
> [ 0.026596] HugeTLB registered 32.0 MiB page size, pre-allocated 0 pages
> [ 0.026604] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
> [ 0.026611] HugeTLB registered 64.0 KiB page size, pre-allocated 0 pages
> [ 0.027683] cryptd: max_cpu_qlen set to 1000
> [ 0.029104] iommu: Default domain type: Translated
> [ 0.029174] vgaarb: loaded
> [ 0.029308] SCSI subsystem initialized
> [ 0.029404] usbcore: registered new interface driver usbfs
> [ 0.029431] usbcore: registered new interface driver hub
> [ 0.029462] usbcore: registered new device driver usb
> [ 0.029593] imx-i2c 2000000.i2c: can't get pinctrl, bus recovery not supported
> [ 0.029652] i2c i2c-0: supply bus not found, using dummy regulator
> [ 0.029829] i2c i2c-0: IMX I2C adapter registered
> [ 0.029908] imx-i2c 2030000.i2c: can't get pinctrl, bus recovery not supported
> [ 0.029944] i2c i2c-1: supply bus not found, using dummy regulator
> [ 0.030010] i2c i2c-1: IMX I2C adapter registered
> [ 0.030082] imx-i2c 2040000.i2c: can't get pinctrl, bus recovery not supported
> [ 0.030122] i2c i2c-2: supply bus not found, using dummy regulator
> [ 0.030227] i2c i2c-2: IMX I2C adapter registered
> [ 0.030303] pps_core: LinuxPPS API ver. 1 registered
> [ 0.030310] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
> [ 0.030324] PTP clock support registered
> [ 0.030552] Advanced Linux Sound Architecture Driver Initialized.
> [ 0.030904] clocksource: Switched to clocksource arch_sys_counter
> [ 0.066437] VFS: Disk quotas dquot_6.6.0
> [ 0.066483] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
> [ 0.069159] NET: Registered protocol family 2
> [ 0.069389] tcp_listen_portaddr_hash hash table entries: 2048 (order: 3, 32768 bytes, linear)
> [ 0.069414] TCP established hash table entries: 32768 (order: 6, 262144 bytes, linear)
> [ 0.069506] TCP bind hash table entries: 32768 (order: 7, 524288 bytes, linear)
> [ 0.069807] TCP: Hash tables configured (established 32768 bind 32768)
> [ 0.069904] UDP hash table entries: 2048 (order: 4, 65536 bytes, linear)
> [ 0.069931] UDP-Lite hash table entries: 2048 (order: 4, 65536 bytes, linear)
> [ 0.070016] NET: Registered protocol family 1
> [ 0.070036] PCI: CLS 0 bytes, default 64
> [ 0.070364] hw perfevents: enabled with armv8_cortex_a72 PMU driver, 7 counters available
> [ 0.070817] Initialise system trusted keyrings
> [ 0.070976] workingset: timestamp_bits=44 max_order=20 bucket_order=0
> [ 0.103862] Key type asymmetric registered
> [ 0.103879] Asymmetric key parser 'x509' registered
> [ 0.103906] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 248)
> [ 0.103915] io scheduler mq-deadline registered
> [ 0.103921] io scheduler kyber registered
> [ 0.104351] pci-host-generic 1f0000000.pcie: host bridge /soc/pcie@1f0000000 ranges:
> [ 0.104380] pci-host-generic 1f0000000.pcie: MEM 0x01f8000000..0x01f815ffff -> 0x0000000000
> [ 0.104401] pci-host-generic 1f0000000.pcie: MEM 0x01f8160000..0x01f81cffff -> 0x0000000000
> [ 0.104423] pci-host-generic 1f0000000.pcie: MEM 0x01f81d0000..0x01f81effff -> 0x0000000000
> [ 0.104441] pci-host-generic 1f0000000.pcie: MEM 0x01f81f0000..0x01f820ffff -> 0x0000000000
> [ 0.104460] pci-host-generic 1f0000000.pcie: MEM 0x01f8210000..0x01f822ffff -> 0x0000000000
> [ 0.104478] pci-host-generic 1f0000000.pcie: MEM 0x01f8230000..0x01f824ffff -> 0x0000000000
> [ 0.104492] pci-host-generic 1f0000000.pcie: MEM 0x01fc000000..0x01fc3fffff -> 0x0000000000
> [ 0.104545] pci-host-generic 1f0000000.pcie: ECAM at [mem 0x1f0000000-0x1f00fffff] for [bus 00]
> [ 0.104605] pci-host-generic 1f0000000.pcie: PCI host bridge to bus 0000:00
> [ 0.104615] pci_bus 0000:00: root bus resource [bus 00]
> [ 0.104624] pci_bus 0000:00: root bus resource [mem 0x1f8000000-0x1f815ffff] (bus address [0x00000000-0x0015ffff])
> [ 0.104636] pci_bus 0000:00: root bus resource [mem 0x1f8160000-0x1f81cffff pref] (bus address [0x00000000-0x0006ffff])
> [ 0.104647] pci_bus 0000:00: root bus resource [mem 0x1f81d0000-0x1f81effff] (bus address [0x00000000-0x0001ffff])
> [ 0.104657] pci_bus 0000:00: root bus resource [mem 0x1f81f0000-0x1f820ffff pref] (bus address [0x00000000-0x0001ffff])
> [ 0.104668] pci_bus 0000:00: root bus resource [mem 0x1f8210000-0x1f822ffff] (bus address [0x00000000-0x0001ffff])
> [ 0.104678] pci_bus 0000:00: root bus resource [mem 0x1f8230000-0x1f824ffff pref] (bus address [0x00000000-0x0001ffff])
> [ 0.104689] pci_bus 0000:00: root bus resource [mem 0x1fc000000-0x1fc3fffff] (bus address [0x00000000-0x003fffff])
> [ 0.104710] pci 0000:00:00.0: [1957:e100] type 00 class 0x020001
> [ 0.104750] pci 0000:00:00.0: BAR 0: [mem 0x1f8000000-0x1f803ffff 64bit] (from Enhanced Allocation, properties 0x0)
> [ 0.104762] pci 0000:00:00.0: BAR 2: [mem 0x1f8160000-0x1f816ffff 64bit pref] (from Enhanced Allocation, properties 0x1)
> [ 0.104774] pci 0000:00:00.0: VF BAR 0: [mem 0x1f81d0000-0x1f81dffff 64bit] (from Enhanced Allocation, properties 0x4)
> [ 0.104786] pci 0000:00:00.0: VF BAR 2: [mem 0x1f81f0000-0x1f81fffff 64bit pref] (from Enhanced Allocation, properties 0x3)
> [ 0.104810] pci 0000:00:00.0: PME# supported from D0 D3hot
> [ 0.104824] pci 0000:00:00.0: VF(n) BAR0 space: [mem 0x1f81d0000-0x1f81effff 64bit] (contains BAR0 for 2 VFs)
> [ 0.104834] pci 0000:00:00.0: VF(n) BAR2 space: [mem 0x1f81f0000-0x1f820ffff 64bit pref] (contains BAR2 for 2 VFs)
> [ 0.104949] pci 0000:00:00.1: [1957:e100] type 00 class 0x020001
> [ 0.104978] pci 0000:00:00.1: BAR 0: [mem 0x1f8040000-0x1f807ffff 64bit] (from Enhanced Allocation, properties 0x0)
> [ 0.104990] pci 0000:00:00.1: BAR 2: [mem 0x1f8170000-0x1f817ffff 64bit pref] (from Enhanced Allocation, properties 0x1)
> [ 0.105002] pci 0000:00:00.1: VF BAR 0: [mem 0x1f8210000-0x1f821ffff 64bit] (from Enhanced Allocation, properties 0x4)
> [ 0.105013] pci 0000:00:00.1: VF BAR 2: [mem 0x1f8230000-0x1f823ffff 64bit pref] (from Enhanced Allocation, properties 0x3)
> [ 0.105036] pci 0000:00:00.1: PME# supported from D0 D3hot
> [ 0.105049] pci 0000:00:00.1: VF(n) BAR0 space: [mem 0x1f8210000-0x1f822ffff 64bit] (contains BAR0 for 2 VFs)
> [ 0.105060] pci 0000:00:00.1: VF(n) BAR2 space: [mem 0x1f8230000-0x1f824ffff 64bit pref] (contains BAR2 for 2 VFs)
> [ 0.105154] pci 0000:00:00.2: [1957:e100] type 00 class 0x020001
> [ 0.105183] pci 0000:00:00.2: BAR 0: [mem 0x1f8080000-0x1f80bffff 64bit] (from Enhanced Allocation, properties 0x0)
> [ 0.105195] pci 0000:00:00.2: BAR 2: [mem 0x1f8180000-0x1f818ffff 64bit pref] (from Enhanced Allocation, properties 0x1)
> [ 0.105216] pci 0000:00:00.2: PME# supported from D0 D3hot
> [ 0.105300] pci 0000:00:00.3: [1957:ee01] type 00 class 0x088001
> [ 0.105333] pci 0000:00:00.3: BAR 0: [mem 0x1f8100000-0x1f811ffff 64bit] (from Enhanced Allocation, properties 0x0)
> [ 0.105344] pci 0000:00:00.3: BAR 2: [mem 0x1f8190000-0x1f819ffff 64bit pref] (from Enhanced Allocation, properties 0x1)
> [ 0.105365] pci 0000:00:00.3: PME# supported from D0 D3hot
> [ 0.105448] pci 0000:00:00.4: [1957:ee02] type 00 class 0x088001
> [ 0.105477] pci 0000:00:00.4: BAR 0: [mem 0x1f8120000-0x1f813ffff 64bit] (from Enhanced Allocation, properties 0x0)
> [ 0.105489] pci 0000:00:00.4: BAR 2: [mem 0x1f81a0000-0x1f81affff 64bit pref] (from Enhanced Allocation, properties 0x1)
> [ 0.105521] pci 0000:00:00.4: PME# supported from D0 D3hot
> [ 0.105606] pci 0000:00:00.5: [1957:eef0] type 00 class 0x020801
> [ 0.105635] pci 0000:00:00.5: BAR 0: [mem 0x1f8140000-0x1f815ffff 64bit] (from Enhanced Allocation, properties 0x0)
> [ 0.105647] pci 0000:00:00.5: BAR 2: [mem 0x1f81b0000-0x1f81bffff 64bit pref] (from Enhanced Allocation, properties 0x1)
> [ 0.105659] pci 0000:00:00.5: BAR 4: [mem 0x1fc000000-0x1fc3fffff 64bit] (from Enhanced Allocation, properties 0x0)
> [ 0.105679] pci 0000:00:00.5: PME# supported from D0 D3hot
> [ 0.105765] pci 0000:00:00.6: [1957:e100] type 00 class 0x020001
> [ 0.105794] pci 0000:00:00.6: BAR 0: [mem 0x1f80c0000-0x1f80fffff 64bit] (from Enhanced Allocation, properties 0x0)
> [ 0.105806] pci 0000:00:00.6: BAR 2: [mem 0x1f81c0000-0x1f81cffff 64bit pref] (from Enhanced Allocation, properties 0x1)
> [ 0.105827] pci 0000:00:00.6: PME# supported from D0 D3hot
> [ 0.106579] pci 0000:00:1f.0: [1957:e001] type 00 class 0x080700
> [ 0.106625] OF: /soc/pcie@1f0000000: no msi-map translation for rid 0xf8 on (null)
> [ 0.106967] layerscape-pcie 3400000.pcie: host bridge /soc/pcie@3400000 ranges:
> [ 0.106993] layerscape-pcie 3400000.pcie: IO 0x8000010000..0x800001ffff -> 0x0000000000
> [ 0.107013] layerscape-pcie 3400000.pcie: MEM 0x8040000000..0x807fffffff -> 0x0040000000
> [ 0.107104] layerscape-pcie 3400000.pcie: PCI host bridge to bus 0001:00
> [ 0.107114] pci_bus 0001:00: root bus resource [bus 00-ff]
> [ 0.107121] pci_bus 0001:00: root bus resource [io 0x0000-0xffff]
> [ 0.107130] pci_bus 0001:00: root bus resource [mem 0x8040000000-0x807fffffff] (bus address [0x40000000-0x7fffffff])
> [ 0.107150] pci 0001:00:00.0: [1957:82c1] type 01 class 0x060400
> [ 0.107210] pci 0001:00:00.0: supports D1 D2
> [ 0.107217] pci 0001:00:00.0: PME# supported from D0 D1 D2 D3hot
> [ 0.108621] pci_bus 0001:01: busn_res: [bus 01-ff] end is updated to 01
> [ 0.108634] pci 0001:00:00.0: PCI bridge to [bus 01]
> [ 0.108723] layerscape-pcie 3500000.pcie: host bridge /soc/pcie@3500000 ranges:
> [ 0.108747] layerscape-pcie 3500000.pcie: IO 0x8800010000..0x880001ffff -> 0x0000000000
> [ 0.108766] layerscape-pcie 3500000.pcie: MEM 0x8840000000..0x887fffffff -> 0x0040000000
> [ 0.108840] layerscape-pcie 3500000.pcie: PCI host bridge to bus 0002:00
> [ 0.108849] pci_bus 0002:00: root bus resource [bus 00-ff]
> [ 0.108861] pci_bus 0002:00: root bus resource [io 0x10000-0x1ffff] (bus address [0x0000-0xffff])
> [ 0.108871] pci_bus 0002:00: root bus resource [mem 0x8840000000-0x887fffffff] (bus address [0x40000000-0x7fffffff])
> [ 0.108891] pci 0002:00:00.0: [1957:82c1] type 01 class 0x060400
> [ 0.108950] pci 0002:00:00.0: supports D1 D2
> [ 0.108957] pci 0002:00:00.0: PME# supported from D0 D1 D2 D3hot
> [ 0.110338] pci_bus 0002:01: busn_res: [bus 01-ff] end is updated to 01
> [ 0.110349] pci 0002:00:00.0: PCI bridge to [bus 01]
> [ 0.110615] IPMI message handler: version 39.2
> [ 0.110641] ipmi device interface
> [ 0.110669] ipmi_si: IPMI System Interface driver
> [ 0.110786] ipmi_si: Unable to find any System Interface(s)
> [ 0.112304] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> [ 0.113001] 21c0500.serial: ttyS0 at MMIO 0x21c0500 (irq = 16, base_baud = 12500000) is a 16550A
> [ 1.712116] printk: console [ttyS0] enabled
> [ 1.716565] 21c0600.serial: ttyS1 at MMIO 0x21c0600 (irq = 16, base_baud = 12500000) is a 16550A
> [ 1.725671] 2270000.serial: ttyLP2 at MMIO 0x2270000 (irq = 17, base_baud = 12500000) is a FSL_LPUART
> [ 1.735738] arm-smmu 5000000.iommu: probing hardware configuration...
> [ 1.742217] arm-smmu 5000000.iommu: SMMUv2 with:
> [ 1.746865] arm-smmu 5000000.iommu: stage 1 translation
> [ 1.752214] arm-smmu 5000000.iommu: stage 2 translation
> [ 1.757551] arm-smmu 5000000.iommu: nested translation
> [ 1.762798] arm-smmu 5000000.iommu: stream matching with 128 register groups
> [ 1.769965] arm-smmu 5000000.iommu: 64 context banks (0 stage-2 only)
> [ 1.776527] arm-smmu 5000000.iommu: Supported page sizes: 0x61311000
> [ 1.782996] arm-smmu 5000000.iommu: Stage-1: 48-bit VA -> 48-bit IPA
> [ 1.789464] arm-smmu 5000000.iommu: Stage-2: 48-bit IPA -> 48-bit PA
> [ 1.796436] at24 0-0050: supply vcc not found, using dummy regulator
> [ 1.803621] at24 0-0050: 4096 byte 24c32 EEPROM, writable, 32 bytes/write
> [ 1.810495] at24 1-0057: supply vcc not found, using dummy regulator
> [ 1.817640] at24 1-0057: 8192 byte 24c64 EEPROM, writable, 32 bytes/write
> [ 1.824509] at24 2-0050: supply vcc not found, using dummy regulator
> [ 1.831649] at24 2-0050: 4096 byte 24c32 EEPROM, writable, 32 bytes/write
> [ 1.838597] mpt3sas version 34.100.00.00 loaded
> [ 1.843906] header.nph=2
> [ 1.846447] sfdp_size=288
> [ 1.849205] spi-nor spi1.0: mx25u3235f (4096 Kbytes)
> [ 1.859852] header.nph=0
> [ 1.862395] sfdp_size=192
> [ 1.865068] spi-nor spi0.0: w25q32dw (4096 Kbytes)
> [ 1.871401] 10 fixed-partitions partitions found on MTD device 20c0000.spi
> [ 1.878316] Creating 10 MTD partitions on "20c0000.spi":
> [ 1.883663] 0x000000000000-0x000000010000 : "rcw"
> [ 1.895213] 0x000000010000-0x000000100000 : "failsafe bootloader"
> [ 1.911211] 0x000000100000-0x000000140000 : "failsafe DP firmware"
> [ 1.919242] 0x000000140000-0x0000001e0000 : "failsafe trusted firmware"
> [ 1.927234] 0x0000001e0000-0x000000200000 : "reserved"
> [ 1.935232] 0x000000200000-0x000000210000 : "configuration store"
> [ 1.943244] 0x000000210000-0x000000300000 : "bootloader"
> [ 1.951230] 0x000000300000-0x000000340000 : "DP firmware"
> [ 1.959226] 0x000000340000-0x0000003e0000 : "trusted firmware"
> [ 1.967238] 0x0000003e0000-0x000000400000 : "bootloader environment"
> [ 1.975845] libphy: Fixed MDIO Bus: probed
> [ 1.980150] mscc_felix 0000:00:00.5: Adding to iommu group 0
> [ 1.985966] mscc_felix 0000:00:00.5: device is disabled, skipping
> [ 1.992148] fsl_enetc 0000:00:00.0: Adding to iommu group 1
> [ 2.102922] fsl_enetc 0000:00:00.0: enabling device (0400 -> 0402)
> [ 2.109167] fsl_enetc 0000:00:00.0: no MAC address specified for SI1, using d2:e9:d1:8e:4e:1c
> [ 2.117734] fsl_enetc 0000:00:00.0: no MAC address specified for SI2, using 2a:b8:1d:68:7f:ff
> [ 2.126646] libphy: Freescale ENETC MDIO Bus: probed
> [ 2.133222] fsl_enetc 0000:00:00.1: Adding to iommu group 2
> [ 2.138948] fsl_enetc 0000:00:00.1: device is disabled, skipping
> [ 2.145022] fsl_enetc 0000:00:00.2: Adding to iommu group 3
> [ 2.150696] fsl_enetc 0000:00:00.2: device is disabled, skipping
> [ 2.156768] fsl_enetc 0000:00:00.6: Adding to iommu group 4
> [ 2.162443] fsl_enetc 0000:00:00.6: device is disabled, skipping
> [ 2.168541] fsl_enetc_mdio 0000:00:00.3: Adding to iommu group 5
> [ 2.278915] fsl_enetc_mdio 0000:00:00.3: enabling device (0400 -> 0402)
> [ 2.285740] libphy: FSL PCIe IE Central MDIO Bus: probed
> [ 2.291111] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.6.0-k
> [ 2.298104] igb: Copyright (c) 2007-2014 Intel Corporation.
> [ 2.303802] dwc3 3100000.usb: Adding to iommu group 6
> [ 2.309161] ------------[ cut here ]------------
> [ 2.313801] WARNING: CPU: 1 PID: 1 at drivers/base/core.c:912 device_links_driver_bound+0x1c0/0x1e8
> [ 2.322880] Modules linked in:
> [ 2.325944] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.7.0-rc6-next-20200522-00040-g43dd7a434139 #800
> [ 2.335285] Hardware name: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier (DT)
> [ 2.343582] pstate: 80000005 (Nzcv daif -PAN -UAO BTYPE=--)
> [ 2.349173] pc : device_links_driver_bound+0x1c0/0x1e8
> [ 2.354327] lr : device_links_driver_bound+0xf8/0x1e8
> [ 2.359393] sp : ffff8000111abb80
> [ 2.362713] x29: ffff8000111abb80 x28: 0000000000000000
> [ 2.368043] x27: 0000000000000006 x26: ffff00207a421c10
> [ 2.373371] x25: 0000000000000003 x24: ffff00207a420cb0
> [ 2.378699] x23: ffff800011009948 x22: ffff8000111abbd8
> [ 2.384027] x21: ffff00207a420c10 x20: ffff8000110a2ae8
> [ 2.389355] x19: ffff00207a420c90 x18: 0000000000000000
> [ 2.394684] x17: ffffffffffff3f00 x16: 0000000000007fff
> [ 2.400013] x15: ffffffffffffffff x14: ffff800011009948
> [ 2.405342] x13: ffff002079cf991c x12: 0000000000000000
> [ 2.410671] x11: 0101010101010101 x10: 7f7f7f7f7f7f7f7f
> [ 2.416000] x9 : ffff800010548e68 x8 : 7f7f7f7f7f7f7f7f
> [ 2.421328] x7 : ffff8000111aba40 x6 : 0000000000000000
> [ 2.426657] x5 : 0000000000000000 x4 : 0000000000000000
> [ 2.431985] x3 : ffff8000110a3380 x2 : 0000000000000000
> [ 2.437313] x1 : 0000000000000001 x0 : ffff00207a401200
> [ 2.442643] Call trace:
> [ 2.445094] device_links_driver_bound+0x1c0/0x1e8
> [ 2.449900] driver_bound+0x70/0xc0
> [ 2.453396] really_probe+0x110/0x318
> [ 2.457068] driver_probe_device+0x40/0x90
> [ 2.461175] device_driver_attach+0x7c/0x88
> [ 2.465369] __driver_attach+0x60/0xe8
> [ 2.469128] bus_for_each_dev+0x7c/0xd0
> [ 2.472974] driver_attach+0x2c/0x38
> [ 2.476557] bus_add_driver+0x194/0x1f8
> [ 2.480403] driver_register+0x6c/0x128
> [ 2.484251] __platform_driver_register+0x50/0x60
> [ 2.488971] dwc3_driver_init+0x24/0x30
> [ 2.492818] do_one_initcall+0x54/0x298
> [ 2.496665] kernel_init_freeable+0x1ec/0x268
> [ 2.501036] kernel_init+0x1c/0x118
> [ 2.504532] ret_from_fork+0x10/0x1c
> [ 2.508117] ---[ end trace 119c2917ee509c34 ]---
> [ 2.512811] dwc3 3110000.usb: Adding to iommu group 7
> [ 2.518134] ------------[ cut here ]------------
> [ 2.522770] WARNING: CPU: 1 PID: 1 at drivers/base/core.c:912 device_links_driver_bound+0x1c0/0x1e8
> [ 2.531848] Modules linked in:
> [ 2.534910] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W 5.7.0-rc6-next-20200522-00040-g43dd7a434139 #800
> [ 2.545647] Hardware name: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier (DT)
> [ 2.553943] pstate: 80000005 (Nzcv daif -PAN -UAO BTYPE=--)
> [ 2.559533] pc : device_links_driver_bound+0x1c0/0x1e8
> [ 2.564688] lr : device_links_driver_bound+0xf8/0x1e8
> [ 2.569753] sp : ffff8000111abb80
> [ 2.573075] x29: ffff8000111abb80 x28: 0000000000000000
> [ 2.578403] x27: 0000000000000006 x26: ffff00207a421c10
> [ 2.583731] x25: 0000000000000003 x24: ffff00207a4210b0
> [ 2.589059] x23: ffff800011009948 x22: ffff8000111abbd8
> [ 2.594387] x21: ffff00207a421010 x20: ffff8000110a2ae8
> [ 2.599715] x19: ffff00207a421090 x18: 0000000000000000
> [ 2.605043] x17: ffffffffffff3f00 x16: 0000000000007fff
> [ 2.610372] x15: ffffffffffffffff x14: ffff800011009948
> [ 2.615700] x13: ffff002079cf991c x12: 0000000000000000
> [ 2.621029] x11: 0101010101010101 x10: 7f7f7f7f7f7f7f7f
> [ 2.626356] x9 : ffff800010548e68 x8 : 7f7f7f7f7f7f7f7f
> [ 2.631685] x7 : ffff8000111aba40 x6 : 0000000000000000
> [ 2.637014] x5 : 0000000000000000 x4 : 0000000000000000
> [ 2.642342] x3 : ffff8000110a3380 x2 : 0000000000000000
> [ 2.647670] x1 : 0000000000000001 x0 : ffff00207a401280
> [ 2.652997] Call trace:
> [ 2.655448] device_links_driver_bound+0x1c0/0x1e8
> [ 2.660253] driver_bound+0x70/0xc0
> [ 2.663749] really_probe+0x110/0x318
> [ 2.667421] driver_probe_device+0x40/0x90
> [ 2.671528] device_driver_attach+0x7c/0x88
> [ 2.675722] __driver_attach+0x60/0xe8
> [ 2.679480] bus_for_each_dev+0x7c/0xd0
> [ 2.683326] driver_attach+0x2c/0x38
> [ 2.686910] bus_add_driver+0x194/0x1f8
> [ 2.690756] driver_register+0x6c/0x128
> [ 2.694603] __platform_driver_register+0x50/0x60
> [ 2.699322] dwc3_driver_init+0x24/0x30
> [ 2.703167] do_one_initcall+0x54/0x298
> [ 2.707014] kernel_init_freeable+0x1ec/0x268
> [ 2.711384] kernel_init+0x1c/0x118
> [ 2.714880] ret_from_fork+0x10/0x1c
> [ 2.718462] ---[ end trace 119c2917ee509c35 ]---
> [ 2.723246] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
> [ 2.729804] ehci-pci: EHCI PCI platform driver
> [ 2.734429] xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
> [ 2.739956] xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 1
> [ 2.747789] xhci-hcd xhci-hcd.0.auto: hcc params 0x0220f66d hci version 0x100 quirks 0x0000000002010010
> [ 2.757249] xhci-hcd xhci-hcd.0.auto: irq 21, io mem 0x03100000
> [ 2.763565] hub 1-0:1.0: USB hub found
> [ 2.767348] hub 1-0:1.0: 1 port detected
> [ 2.771395] xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
> [ 2.776911] xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 2
> [ 2.784605] xhci-hcd xhci-hcd.0.auto: Host supports USB 3.0 SuperSpeed
> [ 2.791187] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
> [ 2.799523] hub 2-0:1.0: USB hub found
> [ 2.803303] hub 2-0:1.0: 1 port detected
> [ 2.807381] xhci-hcd xhci-hcd.1.auto: xHCI Host Controller
> [ 2.812898] xhci-hcd xhci-hcd.1.auto: new USB bus registered, assigned bus number 3
> [ 2.820741] xhci-hcd xhci-hcd.1.auto: hcc params 0x0220f66d hci version 0x100 quirks 0x0000000002010010
> [ 2.830207] xhci-hcd xhci-hcd.1.auto: irq 22, io mem 0x03110000
> [ 2.836470] hub 3-0:1.0: USB hub found
> [ 2.840251] hub 3-0:1.0: 1 port detected
> [ 2.844289] xhci-hcd xhci-hcd.1.auto: xHCI Host Controller
> [ 2.849804] xhci-hcd xhci-hcd.1.auto: new USB bus registered, assigned bus number 4
> [ 2.857499] xhci-hcd xhci-hcd.1.auto: Host supports USB 3.0 SuperSpeed
> [ 2.864080] usb usb4: We don't know the algorithms for LPM for this host, disabling LPM.
> [ 2.872409] hub 4-0:1.0: USB hub found
> [ 2.876267] hub 4-0:1.0: 1 port detected
> [ 2.880393] usbcore: registered new interface driver usb-storage
> [ 2.887177] rtc-rv8803 0-0032: Voltage low, temperature compensation stopped.
> [ 2.894348] rtc-rv8803 0-0032: Voltage low, data loss detected.
> [ 2.901365] rtc-rv8803 0-0032: Voltage low, data is invalid.
> [ 2.907117] rtc-rv8803 0-0032: registered as rtc0
> [ 2.912514] rtc-rv8803 0-0032: Voltage low, data is invalid.
> [ 2.918202] rtc-rv8803 0-0032: hctosys: unable to read the hardware clock
> [ 2.925102] i2c /dev entries driver
> [ 2.934504] sp805-wdt c000000.watchdog: registration successful
> [ 2.940537] sp805-wdt c010000.watchdog: registration successful
> [ 2.947196] qoriq-cpufreq qoriq-cpufreq: Freescale QorIQ CPU frequency scaling driver
> [ 2.955659] sdhci: Secure Digital Host Controller Interface driver
> [ 2.961918] sdhci: Copyright(c) Pierre Ossman
> [ 2.966333] sdhci-pltfm: SDHCI platform and OF driver helper
> [ 2.972762] sdhci-esdhc 2140000.mmc: Adding to iommu group 8
> [ 3.005562] mmc0: SDHCI controller on 2140000.mmc [2140000.mmc] using ADMA
> [ 3.012632] ------------[ cut here ]------------
> [ 3.017310] WARNING: CPU: 0 PID: 1 at drivers/base/core.c:912 device_links_driver_bound+0x1c0/0x1e8
> [ 3.026418] Modules linked in:
> [ 3.029509] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 5.7.0-rc6-next-20200522-00040-g43dd7a434139 #800
> [ 3.040279] Hardware name: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier (DT)
> [ 3.048609] pstate: 80000005 (Nzcv daif -PAN -UAO BTYPE=--)
> [ 3.054226] pc : device_links_driver_bound+0x1c0/0x1e8
> [ 3.059405] lr : device_links_driver_bound+0xf8/0x1e8
> [ 3.064491] sp : ffff8000111abb80
> [ 3.067831] x29: ffff8000111abb80 x28: 0000000000000000
> [ 3.073189] x27: 0000000000000006 x26: ffff00207a421c10
> [ 3.078544] x25: 0000000000000003 x24: ffff00207a41a4b0
> [ 3.083898] x23: ffff800011009948 x22: ffff8000111abbd8
> [ 3.089251] x21: ffff00207a41a410 x20: ffff8000110a2ae8
> [ 3.094604] x19: ffff00207a41a490 x18: 0000000000000010
> [ 3.099957] x17: 0000000000000000 x16: 0000000000000000
> [ 3.105310] x15: ffffffffffffffff x14: 0720072007200741
> [ 3.110664] x13: 074d074407410720 x12: 0767076e07690773
> [ 3.116016] x11: 07750720075d0763 x10: 00000000000009f0
> [ 3.121370] x9 : ffff800010548e68 x8 : ffff00207ae50a50
> [ 3.126723] x7 : 0000000000000000 x6 : 0000000000000001
> [ 3.132075] x5 : 0000000000008340 x4 : 0000000000000000
> [ 3.137428] x3 : ffff8000110a3380 x2 : 0000000000000000
> [ 3.142780] x1 : 0000000000000001 x0 : ffff00207a401000
> [ 3.148133] Call trace:
> [ 3.150609] device_links_driver_bound+0x1c0/0x1e8
> [ 3.155442] driver_bound+0x70/0xc0
> [ 3.158963] really_probe+0x110/0x318
> [ 3.162660] driver_probe_device+0x40/0x90
> [ 3.166793] device_driver_attach+0x7c/0x88
> [ 3.171013] __driver_attach+0x60/0xe8
> [ 3.174794] bus_for_each_dev+0x7c/0xd0
> [ 3.178663] driver_attach+0x2c/0x38
> [ 3.182270] bus_add_driver+0x194/0x1f8
> [ 3.186139] driver_register+0x6c/0x128
> [ 3.190012] __platform_driver_register+0x50/0x60
> [ 3.194755] sdhci_esdhc_driver_init+0x24/0x30
> [ 3.199237] do_one_initcall+0x54/0x298
> [ 3.203110] kernel_init_freeable+0x1ec/0x268
> [ 3.207507] kernel_init+0x1c/0x118
> [ 3.211025] ret_from_fork+0x10/0x1c
> [ 3.214629] ---[ end trace 119c2917ee509c36 ]---
> [ 3.219842] sdhci-esdhc 2150000.mmc: Adding to iommu group 9
> [ 3.252837] mmc1: SDHCI controller on 2150000.mmc [2150000.mmc] using ADMA
> [ 3.259902] ------------[ cut here ]------------
> [ 3.264577] WARNING: CPU: 1 PID: 1 at drivers/base/core.c:912 device_links_driver_bound+0x1c0/0x1e8
> [ 3.273685] Modules linked in:
> [ 3.276775] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W 5.7.0-rc6-next-20200522-00040-g43dd7a434139 #800
> [ 3.287544] Hardware name: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier (DT)
> [ 3.295873] pstate: 80000005 (Nzcv daif -PAN -UAO BTYPE=--)
> [ 3.301490] pc : device_links_driver_bound+0x1c0/0x1e8
> [ 3.306669] lr : device_links_driver_bound+0xf8/0x1e8
> [ 3.311754] sp : ffff8000111abb80
> [ 3.315093] x29: ffff8000111abb80 x28: 0000000000000000
> [ 3.320449] x27: 0000000000000006 x26: ffff00207a421c10
> [ 3.325805] x25: 0000000000000003 x24: ffff00207a41a8b0
> [ 3.331159] x23: ffff800011009948 x22: ffff8000111abbd8
> [ 3.336511] x21: ffff00207a41a810 x20: ffff8000110a2ae8
> [ 3.341864] x19: ffff00207a41a890 x18: 0000000000000010
> [ 3.347217] x17: 00000000000003fb x16: 0000000000000001
> [ 3.352569] x15: ffffffffffffffff x14: 0720072007200741
> [ 3.357921] x13: 074d074407410720 x12: 0767076e07690773
> [ 3.363273] x11: 07750720075d0763 x10: 00000000000009f0
> [ 3.368627] x9 : ffff800010548e68 x8 : ffff00207ae50a50
> [ 3.373980] x7 : 0000000000000001 x6 : 0000000000000001
> [ 3.379333] x5 : 0000000000007670 x4 : 0000000000000000
> [ 3.384686] x3 : ffff8000110a3380 x2 : 0000000000000000
> [ 3.390036] x1 : 0000000000000001 x0 : ffff00207a401080
> [ 3.395391] Call trace:
> [ 3.397863] device_links_driver_bound+0x1c0/0x1e8
> [ 3.402694] driver_bound+0x70/0xc0
> [ 3.406216] really_probe+0x110/0x318
> [ 3.409911] driver_probe_device+0x40/0x90
> [ 3.414044] device_driver_attach+0x7c/0x88
> [ 3.418262] __driver_attach+0x60/0xe8
> [ 3.422043] bus_for_each_dev+0x7c/0xd0
> [ 3.425912] driver_attach+0x2c/0x38
> [ 3.429518] bus_add_driver+0x194/0x1f8
> [ 3.433387] driver_register+0x6c/0x128
> [ 3.434954] mmc0: new ultra high speed SDR104 SDHC card at address 1234
> [ 3.437259] __platform_driver_register+0x50/0x60
> [ 3.437277] sdhci_esdhc_driver_init+0x24/0x30
> [ 3.453131] do_one_initcall+0x54/0x298
> [ 3.457004] kernel_init_freeable+0x1ec/0x268
> [ 3.461400] kernel_init+0x1c/0x118
> [ 3.464920] ret_from_fork+0x10/0x1c
> [ 3.468521] ---[ end trace 119c2917ee509c37 ]---
> [ 3.474335] mmcblk0: mmc0:1234 SA16G 14.4 GiB
> [ 3.474995] usbcore: registered new interface driver usbhid
> [ 3.484513] usbhid: USB HID core driver
> [ 3.485993] mmcblk0: p1
> [ 3.489639] wm8904 2-001a: supply DCVDD not found, using dummy regulator
> [ 3.497984] wm8904 2-001a: supply DBVDD not found, using dummy regulator
> [ 3.504924] wm8904 2-001a: supply AVDD not found, using dummy regulator
> [ 3.511751] wm8904 2-001a: supply CPVDD not found, using dummy regulator
> [ 3.518683] wm8904 2-001a: supply MICVDD not found, using dummy regulator
> [ 3.527720] wm8904 2-001a: revision A
> [ 3.531539] usb 3-1: new high-speed USB device number 2 using xhci-hcd
> [ 3.550758] NET: Registered protocol family 10
> [ 3.557190] Segment Routing with IPv6
> [ 3.561484] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
> [ 3.568527] NET: Registered protocol family 17
> [ 3.573204] Bridge firewalling registered
> [ 3.577592] 8021q: 802.1Q VLAN Support v1.8
> [ 3.581987] Key type dns_resolver registered
> [ 3.586796] registered taskstats version 1
> [ 3.590979] Loading compiled-in X.509 certificates
> [ 3.601872] fsl-edma 22c0000.dma-controller: Adding to iommu group 10
> [ 3.611553] ------------[ cut here ]------------
> [ 3.616236] WARNING: CPU: 1 PID: 23 at drivers/base/core.c:912 device_links_driver_bound+0x1c0/0x1e8
> [ 3.625431] Modules linked in:
> [ 3.628522] CPU: 1 PID: 23 Comm: kworker/1:1 Tainted: G W 5.7.0-rc6-next-20200522-00040-g43dd7a434139 #800
> [ 3.639553] Hardware name: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier (DT)
> [ 3.647889] Workqueue: events deferred_probe_work_func
> [ 3.653073] pstate: 80000005 (Nzcv daif -PAN -UAO BTYPE=--)
> [ 3.658688] pc : device_links_driver_bound+0x1c0/0x1e8
> [ 3.663868] lr : device_links_driver_bound+0xf8/0x1e8
> [ 3.668955] sp : ffff8000112dbb80
> [ 3.672294] x29: ffff8000112dbb80 x28: 0000000000000000
> [ 3.677650] x27: ffff00207af84848 x26: ffff00207a421c10
> [ 3.683005] x25: 0000000000000003 x24: ffff00207a41bcb0
> [ 3.688359] x23: ffff800011009948 x22: ffff8000112dbbd8
> [ 3.693712] x21: ffff00207a41bc10 x20: ffff8000110a2ae8
> [ 3.699065] x19: ffff00207a41bc90 x18: 0000000000000000
> [ 3.704417] x17: 00000000040e1236 x16: 0000000065a74b1b
> [ 3.709770] x15: ffffffffffffffff x14: ffff800011009948
> [ 3.715123] x13: ffff002079fa291c x12: 0000000000000030
> [ 3.720476] x11: 0101010101010101 x10: ffffffffffffffff
> [ 3.725829] x9 : ffff800010548e68 x8 : ffff002079fb3f80
> [ 3.731182] x7 : 0000000000000000 x6 : 000000000000003f
> [ 3.736535] x5 : 0000000000000040 x4 : 0000000000000000
> [ 3.741887] x3 : ffff8000110a3380 x2 : 0000000000000000
> [ 3.747239] x1 : 0000000000000001 x0 : ffff00207a401180
> [ 3.752593] Call trace:
> [ 3.755065] device_links_driver_bound+0x1c0/0x1e8
> [ 3.759897] driver_bound+0x70/0xc0
> [ 3.763417] really_probe+0x110/0x318
> [ 3.767112] driver_probe_device+0x40/0x90
> [ 3.771244] __device_attach_driver+0x8c/0xd0
> [ 3.775637] bus_for_each_drv+0x84/0xd8
> [ 3.779506] __device_attach+0xd4/0x110
> [ 3.783375] device_initial_probe+0x1c/0x28
> [ 3.787592] bus_probe_device+0xa4/0xb0
> [ 3.791462] deferred_probe_work_func+0x7c/0xb8
> [ 3.796034] process_one_work+0x1f4/0x4b8
> [ 3.800080] worker_thread+0x218/0x498
> [ 3.803862] kthread+0x160/0x168
> [ 3.807121] ret_from_fork+0x10/0x1c
> [ 3.810723] ---[ end trace 119c2917ee509c39 ]---
> [ 3.815842] pcieport 0001:00:00.0: Adding to iommu group 11
> [ 3.822335] pcieport 0001:00:00.0: AER: enabled with IRQ 24
> [ 3.828417] pcieport 0002:00:00.0: Adding to iommu group 12
> [ 3.834817] pcieport 0002:00:00.0: AER: enabled with IRQ 26
> [ 3.841914] fsl-qdma 8380000.dma-controller: Adding to iommu group 13
> [ 3.850471] ------------[ cut here ]------------
> [ 3.855153] WARNING: CPU: 1 PID: 23 at drivers/base/core.c:912 device_links_driver_bound+0x1c0/0x1e8
> [ 3.864348] Modules linked in:
> [ 3.867439] CPU: 1 PID: 23 Comm: kworker/1:1 Tainted: G W 5.7.0-rc6-next-20200522-00040-g43dd7a434139 #800
> [ 3.878470] Hardware name: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier (DT)
> [ 3.886807] Workqueue: events deferred_probe_work_func
> [ 3.891991] pstate: 80000005 (Nzcv daif -PAN -UAO BTYPE=--)
> [ 3.897607] pc : device_links_driver_bound+0x1c0/0x1e8
> [ 3.902785] lr : device_links_driver_bound+0xf8/0x1e8
> [ 3.907872] sp : ffff8000112dbb80
> [ 3.911211] x29: ffff8000112dbb80 x28: 0000000000000000
> [ 3.916568] x27: ffff00207af84848 x26: ffff00207a421c10
> [ 3.921921] x25: 0000000000000003 x24: ffff00207a4220b0
> [ 3.927274] x23: ffff800011009948 x22: ffff8000112dbbd8
> [ 3.932626] x21: ffff00207a422010 x20: ffff8000110a2ae8
> [ 3.937979] x19: ffff00207a422090 x18: 0000000000000000
> [ 3.943332] x17: 0000000000000028 x16: 0000000000000050
> [ 3.948686] x15: ffffffffffffffff x14: ffff800011009948
> [ 3.954038] x13: ffff002079fa391c x12: 0000000000000030
> [ 3.959390] x11: 0101010101010101 x10: ffffffffffffffff
> [ 3.964742] x9 : ffff800010548e68 x8 : 746e6f632d616d64
> [ 3.970096] x7 : ffff8000112dba00 x6 : 0000000000000000
> [ 3.975449] x5 : 0000000000000000 x4 : 0000000000000000
> [ 3.980801] x3 : ffff8000110a3380 x2 : 0000000000000000
> [ 3.986152] x1 : 0000000000000001 x0 : ffff00207a401400
> [ 3.991505] Call trace:
> [ 3.993978] device_links_driver_bound+0x1c0/0x1e8
> [ 3.998809] driver_bound+0x70/0xc0
> [ 4.002329] really_probe+0x110/0x318
> [ 4.006024] driver_probe_device+0x40/0x90
> [ 4.010155] __device_attach_driver+0x8c/0xd0
> [ 4.014547] bus_for_each_drv+0x84/0xd8
> [ 4.018416] __device_attach+0xd4/0x110
> [ 4.022285] device_initial_probe+0x1c/0x28
> [ 4.026503] bus_probe_device+0xa4/0xb0
> [ 4.030371] deferred_probe_work_func+0x7c/0xb8
> [ 4.034944] process_one_work+0x1f4/0x4b8
> [ 4.038989] worker_thread+0x218/0x498
> [ 4.042772] kthread+0x160/0x168
> [ 4.046031] ret_from_fork+0x10/0x1c
> [ 4.049634] ---[ end trace 119c2917ee509c3a ]---
> [ 4.067995] asoc-simple-card sound: wm8904-hifi <-> f150000.audio-controller mapping ok
> [ 4.080340] hub 3-1:1.0: USB hub found
> [ 4.085394] hub 3-1:1.0: 7 ports detected
> [ 4.092223] asoc-simple-card sound: wm8904-hifi <-> f140000.audio-controller mapping ok
> [ 4.100866] asoc-simple-card sound: ASoC: no DMI vendor name!
> [ 4.106933] random: fast init done
> [ 4.110951] mmc1: new HS400 MMC card at address 0001
> [ 4.117316] mmcblk1: mmc1:0001 S0J58X 29.6 GiB
> [ 4.122436] mmcblk1boot0: mmc1:0001 S0J58X partition 1 31.5 MiB
> [ 4.130037] mmcblk1boot1: mmc1:0001 S0J58X partition 2 31.5 MiB
> [ 4.130304] irq: no irq domain found for interrupt-controller@1c !
> [ 4.136289] mmcblk1rpmb: mmc1:0001 S0J58X partition 3 4.00 MiB, chardev (245:0)
> [ 4.142321] irq: no irq domain found for interrupt-controller@1c !
> [ 4.156366] gpio-keys buttons0: Found button without gpio or irq
> [ 4.162815] gpio-keys: probe of buttons0 failed with error -22
> [ 4.162821] mmcblk1: p1 p2
> [ 4.172097] ALSA device list:
> [ 4.175148] #0: f150000.audio-controller-wm8904-hifi
> [ 4.182701] EXT4-fs (mmcblk1p2): INFO: recovery required on readonly filesystem
> [ 4.190137] EXT4-fs (mmcblk1p2): write access will be enabled during recovery
> [ 4.263821] EXT4-fs (mmcblk1p2): recovery complete
> [ 4.270940] EXT4-fs (mmcblk1p2): mounted filesystem with ordered data mode. Opts: (null)
> [ 4.279327] VFS: Mounted root (ext4 filesystem) readonly on device 179:34.
> [ 4.287179] devtmpfs: mounted
> [ 4.301063] Freeing unused kernel memory: 3264K
> [ 4.305875] Run /sbin/init as init process
> [ 4.310036] with arguments:
> [ 4.313051] /sbin/init
> [ 4.315802] with environment:
> [ 4.318991] HOME=/
> [ 4.321370] TERM=linux
> [ 4.371451] EXT4-fs (mmcblk1p2): re-mounted. Opts: (null)
> [ 4.471037] usb 3-1.6: new full-speed USB device number 3 using xhci-hcd
> [ 4.541101] udevd[127]: starting version 3.2.8
> [ 4.549864] random: udevd: uninitialized urandom read (16 bytes read)
> [ 4.557780] random: udevd: uninitialized urandom read (16 bytes read)
> [ 4.564612] random: udevd: uninitialized urandom read (16 bytes read)
> [ 4.576379] udevd[127]: specified group 'kvm' unknown
> [ 4.606090] udevd[129]: starting eudev-3.2.8
> [ 6.853488] fsl_enetc 0000:00:00.0 gbe0: renamed from eth0
> [ 9.585282] urandom_read: 3 callbacks suppressed
> [ 9.585295] random: dd: uninitialized urandom read (512 bytes read)
> [ 9.748164] Qualcomm Atheros AR8031/AR8033 0000:00:00.0:05: attached PHY driver [Qualcomm Atheros AR8031/AR8033] (mii_bus:phy_addr=0000:00:00.0:05, irq=POLL)
> [ 9.779903] fsl_enetc 0000:00:00.0 gbe0: Link is Down
> [ 9.836673] random: dropbear: uninitialized urandom read (32 bytes read)
> [ 11.843533] fsl_enetc 0000:00:00.0 gbe0: Link is Up - 10Mbps/Full - flow control off
> [ 11.851417] IPv6: ADDRCONF(NETDEV_CHANGE): gbe0: link becomes ready
> [ 12.871335] fsl_enetc 0000:00:00.0 gbe0: Link is Down
> [ 14.915541] fsl_enetc 0000:00:00.0 gbe0: Link is Up - 1Gbps/Full - flow control off

Thanks for the log and report. I haven't spent too much time thinking
about this, but can you give this a shot?
https://lore.kernel.org/lkml/20200520043626.181820-1-saravanak@google.com/

-Saravana

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