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Subject: Re: [PATCH] igb/igc: Don't warn on fatal read failures when the
 device is removed
To:     Lyude Paul <lyude@redhat.com>, intel-wired-lan@lists.osuosl.org,
        netdev@vger.kernel.org
Cc:     Feng Tang <feng.tang@intel.com>,
        Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
        "David S. Miller" <davem@davemloft.net>,
        linux-kernel@vger.kernel.org
References: <20190822183318.27634-1-lyude@redhat.com>
From:   "Neftin, Sasha" <sasha.neftin@intel.com>
Message-ID: <0e601456-58c3-b6ed-3be2-3eb5eec12eb4@intel.com>
Date:   Sat, 24 Aug 2019 17:40:45 +0300
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On 8/22/2019 21:33, Lyude Paul wrote:
> 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;
> 
Thanks, for igc
Acked-by: Sasha Neftin <sasha.neftin@intel.com>