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    SubjectRe: [ 57/72] genirq: Unmask oneshot irqs when thread was not woken
    Date
    Hi

    On Monday 05 March 2012, Sven Joachim wrote:
    > On 2012-02-28 02:05 +0100, Greg KH wrote:
    >
    > > 3.2-stable review patch. If anyone has any objections, please let me know.
    >
    > Alas, the commit below broke the WiFi on my laptop, where
    > "iwlist wlan0 scan" now just reports: " wlan0 No scan results".
    >
    > This is not specific to 3.2, the same problem exists in 3.0.23 and
    > 3.3-rc6 while previous releases worked.

    I can confirm this regression on an old PIII based notebook with a
    32 bit BCM4306/3 PCMCIA card:

    02:00.0 Network controller [0280]: Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller [14e4:4320] (rev 03)
    Subsystem: Linksys WPC54G v1 / WPC54GS v1 802.11g Wireless-G Notebook Adapter [1737:4320]
    Flags: bus master, fast devsel, latency 64, IRQ 10
    Memory at 20000000 (32-bit, non-prefetchable) [size=8K]
    Capabilities: [40] Power Management version 2
    Kernel driver in use: b43-pci-bridge

    I can observe these differences in the dmesg output (3.2.9 + current
    stable queue-3.2):

    The kernel configuration is identical in both cases, the only
    difference is "genirq: Unmask oneshot irqs when thread was not woken"
    being applied or not.

    --- working <-- 3.2.9 + current stable queue-3.2, with "genirq: Unmask oneshot irqs when thread was not woken" reverted
    +++ broken <-- 3.2.9 + current stable queue-3.2
    @@ -125,6 +125,7 @@ Initializing cgroup subsys freezer
    Initializing cgroup subsys net_cls
    Initializing cgroup subsys blkio
    Initializing cgroup subsys perf_event
    +CPU serial number disabled.
    mce: CPU supports 5 MCE banks
    SMP alternatives: switching to UP code
    Freeing SMP alternatives: 8k freed
    @@ -137,9 +138,16 @@ SMP disabled
    Performance Events:
    no APIC, boot with the "lapic" boot parameter to force-enable it.
    no hardware sampling interrupt available.
    -Broken PMU hardware detected, using software events only.
    +p6 PMU driver.
    +... version: 0
    +... bit width: 32
    +... generic registers: 2
    +... value mask: 00000000ffffffff
    +... max period: 000000007fffffff
    +... fixed-purpose events: 0
    +... event mask: 0000000000000003
    Brought up 1 CPUs
    Total of 1 processors activated (1989.75 BogoMIPS).
    devtmpfs: initialized
    PM: Registering ACPI NVS region at eeff000 (4096 bytes)
    print_constraints: dummy:
    @@ -174,12 +182,12 @@ pci 0000:00:00.0: reg 10: [mem 0xec00000
    type 1 class 0x000604
    pci 0000:00:01.0: supports D1
    type 2 class 0x000607
    -pci 0000:00:04.0: reg 10: [mem 0x10000000-0x10000fff]
    +pci 0000:00:04.0: reg 10: [mem 0x00000000-0x00000fff]
    pci 0000:00:04.0: supports D1 D2
    pci 0000:00:04.0: PME# supported from D0 D1 D2 D3hot D3cold
    pci 0000:00:04.0: PME# disabled
    type 2 class 0x000607
    -pci 0000:00:04.1: reg 10: [mem 0x14000000-0x14000fff]
    +pci 0000:00:04.1: reg 10: [mem 0x00000000-0x00000fff]
    pci 0000:00:04.1: supports D1 D2
    pci 0000:00:04.1: PME# supported from D0 D1 D2 D3hot D3cold
    pci 0000:00:04.1: PME# disabled
    @@ -299,6 +307,10 @@ pnp: PnP ACPI: found 11 devices
    ACPI: ACPI bus type pnp unregistered
    Switching to clocksource acpi_pm
    PCI: max bus depth: 1 pci_try_num: 2
    +pci 0000:00:04.0: BAR 0: assigned [mem 0x10000000-0x10000fff]
    +(PCI address [0x10000000-0x10000fff])
    +pci 0000:00:04.1: BAR 0: assigned [mem 0x14000000-0x14000fff]
    +(PCI address [0x14000000-0x14000fff])
    pci 0000:00:11.0: BAR 6: assigned [mem 0x10020000-0x1003ffff pref]
    pci 0000:00:04.1: BAR 16: assigned [mem 0x18000000-0x1bffffff]
    pci 0000:00:04.1: BAR 15: assigned [mem 0x1c000000-0x1fffffff pref]
    @@ -326,9 +338,11 @@ pci 0000:00:01.0: setting latency timer
    enabled at IRQ 10
    PCI: setting IRQ 10 as level-triggered
    -> GSI 10 (level, low) -> IRQ 10
    +pci 0000:00:04.0: setting latency timer to 64
    enabled at IRQ 11
    PCI: setting IRQ 11 as level-triggered
    -> GSI 11 (level, low) -> IRQ 11
    +pci 0000:00:04.1: setting latency timer to 64
    pci_bus 0000:00: resource 0 [io 0x0000-0xffff]
    pci_bus 0000:00: resource 1 [mem 0x00000000-0xffffffff]
    pci_bus 0000:01: resource 1 [mem 0xe8100000-0xe81fffff]
    @@ -562,20 +576,6 @@ b43-phy0: Hardware crypto acceleration n
    b43-phy0: QoS not supported by firmware
    ADDRCONF(NETDEV_UP): wlan0: link is not ready
    NET: Registered protocol family 17
    -wlan0: authenticate with [redacted MAC address] (try 1)
    -wlan0: authenticated
    -wlan0: associate with [redacted MAC address] (try 1)
    -wlan0: RX AssocResp from [redacted MAC address] (capab=0x411 status=0 aid=1)
    -wlan0: associated
    -ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
    -cfg80211: Calling CRDA for country: DE
    -Intel AES-NI instructions are not detected.
    -cfg80211: Regulatory domain changed to country: DE
    -cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
    -cfg80211: (2400000 KHz - 2483500 KHz @ 40000 KHz), (N/A, 2000 mBm)
    -cfg80211: (5150000 KHz - 5250000 KHz @ 40000 KHz), (N/A, 2000 mBm)
    -cfg80211: (5250000 KHz - 5350000 KHz @ 40000 KHz), (N/A, 2000 mBm)
    -cfg80211: (5470000 KHz - 5725000 KHz @ 40000 KHz), (N/A, 2698 mBm)
    lp0: using parport0 (interrupt-driven).
    lp0: console ready
    ppdev: user-space parallel port driver
    @@ -589,4 +589,3 @@ mtrr: base(0xf2000000) is not aligned on
    agpgart-via 0000:00:00.0: AGP 2.0 bridge
    agpgart-via 0000:00:00.0: putting AGP V2 device into 0x mode
    pci 0000:01:00.0: putting AGP V2 device into 0x mode
    -wlan0: no IPv6 routers present
    While I don't get any revealing error messages, once "genirq: Unmask
    oneshot irqs when thread was not woken" is applied the wlan card
    stops working (no scan results, unable to auth).

    I cannot reproduce this problem on a different amd64/ 64 bit system
    with a BCM4318 PCI card, which continues to work fine.

    Regards
    Stefan Lippers-Hollmann


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