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    Subject[PATCH] igb/igc: Don't warn on fatal read failures when the device is removed
    Date
    Fatal read errors are worth warning about, unless of course the device
    was just unplugged from the machine - something that's a rather normal
    occurence when the igb/igc adapter is located on a Thunderbolt dock. So,
    let's only WARN() if there's a fatal read error while the device is
    still present.

    This fixes the following WARN splat that's been appearing whenever I
    unplug my Caldigit TS3 Thunderbolt dock from my laptop:

    igb 0000:09:00.0 enp9s0: PCIe link lost
    ------------[ cut here ]------------
    igb: Failed to read reg 0x18!
    WARNING: CPU: 7 PID: 516 at
    drivers/net/ethernet/intel/igb/igb_main.c:756 igb_rd32+0x57/0x6a [igb]
    Modules linked in: igb dca thunderbolt fuse vfat fat elan_i2c mei_wdt
    mei_hdcp i915 wmi_bmof intel_wmi_thunderbolt iTCO_wdt
    iTCO_vendor_support x86_pkg_temp_thermal intel_powerclamp joydev
    coretemp crct10dif_pclmul crc32_pclmul i2c_algo_bit ghash_clmulni_intel
    intel_cstate drm_kms_helper intel_uncore syscopyarea sysfillrect
    sysimgblt fb_sys_fops intel_rapl_perf intel_xhci_usb_role_switch mei_me
    drm roles idma64 i2c_i801 ucsi_acpi typec_ucsi mei intel_lpss_pci
    processor_thermal_device typec intel_pch_thermal intel_soc_dts_iosf
    intel_lpss int3403_thermal thinkpad_acpi wmi int340x_thermal_zone
    ledtrig_audio int3400_thermal acpi_thermal_rel acpi_pad video
    pcc_cpufreq ip_tables serio_raw nvme nvme_core crc32c_intel uas
    usb_storage e1000e i2c_dev
    CPU: 7 PID: 516 Comm: kworker/u16:3 Not tainted 5.2.0-rc1Lyude-Test+ #14
    Hardware name: LENOVO 20L8S2N800/20L8S2N800, BIOS N22ET35W (1.12 ) 04/09/2018
    Workqueue: kacpi_hotplug acpi_hotplug_work_fn
    RIP: 0010:igb_rd32+0x57/0x6a [igb]
    Code: 87 b8 fc ff ff 48 c7 47 08 00 00 00 00 48 c7 c6 33 42 9b c0 4c 89
    c7 e8 47 45 cd dc 89 ee 48 c7 c7 43 42 9b c0 e8 c1 94 71 dc <0f> 0b eb
    08 8b 00 ff c0 75 b0 eb c8 44 89 e0 5d 41 5c c3 0f 1f 44
    RSP: 0018:ffffba5801cf7c48 EFLAGS: 00010286
    RAX: 0000000000000000 RBX: ffff9e7956608840 RCX: 0000000000000007
    RDX: 0000000000000000 RSI: ffffba5801cf7b24 RDI: ffff9e795e3d6a00
    RBP: 0000000000000018 R08: 000000009dec4a01 R09: ffffffff9e61018f
    R10: 0000000000000000 R11: ffffba5801cf7ae5 R12: 00000000ffffffff
    R13: ffff9e7956608840 R14: ffff9e795a6f10b0 R15: 0000000000000000
    FS: 0000000000000000(0000) GS:ffff9e795e3c0000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000564317bc4088 CR3: 000000010e00a006 CR4: 00000000003606e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
    igb_release_hw_control+0x1a/0x30 [igb]
    igb_remove+0xc5/0x14b [igb]
    pci_device_remove+0x3b/0x93
    device_release_driver_internal+0xd7/0x17e
    pci_stop_bus_device+0x36/0x75
    pci_stop_bus_device+0x66/0x75
    pci_stop_bus_device+0x66/0x75
    pci_stop_and_remove_bus_device+0xf/0x19
    trim_stale_devices+0xc5/0x13a
    ? __pm_runtime_resume+0x6e/0x7b
    trim_stale_devices+0x103/0x13a
    ? __pm_runtime_resume+0x6e/0x7b
    trim_stale_devices+0x103/0x13a
    acpiphp_check_bridge+0xd8/0xf5
    acpiphp_hotplug_notify+0xf7/0x14b
    ? acpiphp_check_bridge+0xf5/0xf5
    acpi_device_hotplug+0x357/0x3b5
    acpi_hotplug_work_fn+0x1a/0x23
    process_one_work+0x1a7/0x296
    worker_thread+0x1a8/0x24c
    ? process_scheduled_works+0x2c/0x2c
    kthread+0xe9/0xee
    ? kthread_destroy_worker+0x41/0x41
    ret_from_fork+0x35/0x40
    ---[ end trace 252bf10352c63d22 ]---

    Signed-off-by: Lyude Paul <lyude@redhat.com>
    Fixes: 47e16692b26b ("igb/igc: warn when fatal read failure happens")
    Cc: Feng Tang <feng.tang@intel.com>
    Cc: Sasha Neftin <sasha.neftin@intel.com>
    Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
    Cc: intel-wired-lan@lists.osuosl.org
    ---
    drivers/net/ethernet/intel/igb/igb_main.c | 3 ++-
    drivers/net/ethernet/intel/igc/igc_main.c | 3 ++-
    2 files changed, 4 insertions(+), 2 deletions(-)

    diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
    index e5b7e638df28..1a7f7cd28df9 100644
    --- a/drivers/net/ethernet/intel/igb/igb_main.c
    +++ b/drivers/net/ethernet/intel/igb/igb_main.c
    @@ -753,7 +753,8 @@ u32 igb_rd32(struct e1000_hw *hw, u32 reg)
    struct net_device *netdev = igb->netdev;
    hw->hw_addr = NULL;
    netdev_err(netdev, "PCIe link lost\n");
    - WARN(1, "igb: Failed to read reg 0x%x!\n", reg);
    + WARN(pci_device_is_present(igb->pdev),
    + "igb: Failed to read reg 0x%x!\n", reg);
    }

    return value;
    diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
    index 28072b9aa932..f873a4b35eaf 100644
    --- a/drivers/net/ethernet/intel/igc/igc_main.c
    +++ b/drivers/net/ethernet/intel/igc/igc_main.c
    @@ -3934,7 +3934,8 @@ u32 igc_rd32(struct igc_hw *hw, u32 reg)
    hw->hw_addr = NULL;
    netif_device_detach(netdev);
    netdev_err(netdev, "PCIe link lost, device now detached\n");
    - WARN(1, "igc: Failed to read reg 0x%x!\n", reg);
    + WARN(pci_device_is_present(igc->pdev),
    + "igc: Failed to read reg 0x%x!\n", reg);
    }

    return value;
    --
    2.21.0
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