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Subject: Re: [Intel-wired-lan] [PATCH v2 iwl-net] igc: don't fail igc_probe() on LED setup error X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 10/09/2025 16:47, Kohei Enju wrote: > When igc_led_setup() fails, igc_probe() fails and triggers kernel panic > in free_netdev() since unregister_netdev() is not called. [1] > This behavior can be tested using fault-injection framework, especially > the failslab feature. [2] > > Since LED support is not mandatory, treat LED setup failures as > non-fatal and continue probe with a warning message, consequently > avoiding the kernel panic. > > [1] > kernel BUG at net/core/dev.c:12047! > Oops: invalid opcode: 0000 [#1] SMP NOPTI > CPU: 0 UID: 0 PID: 937 Comm: repro-igc-led-e Not tainted 6.17.0-rc4-enjuk-tnguy-00865-gc4940196ab02 #64 PREEMPT(voluntary) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > RIP: 0010:free_netdev+0x278/0x2b0 > [...] > Call Trace: > > igc_probe+0x370/0x910 > local_pci_probe+0x3a/0x80 > pci_device_probe+0xd1/0x200 > [...] > > [2] > #!/bin/bash -ex > > FAILSLAB_PATH=/sys/kernel/debug/failslab/ > DEVICE=0000:00:05.0 > START_ADDR=$(grep " igc_led_setup" /proc/kallsyms \ > | awk '{printf("0x%s", $1)}') > END_ADDR=$(printf "0x%x" $((START_ADDR + 0x100))) > > echo $START_ADDR > $FAILSLAB_PATH/require-start > echo $END_ADDR > $FAILSLAB_PATH/require-end > echo 1 > $FAILSLAB_PATH/times > echo 100 > $FAILSLAB_PATH/probability > echo N > $FAILSLAB_PATH/ignore-gfp-wait > > echo $DEVICE > /sys/bus/pci/drivers/igc/bind > > Fixes: ea578703b03d ("igc: Add support for LEDs on i225/i226") > Signed-off-by: Kohei Enju > Reviewed-by: Paul Menzel > Reviewed-by: Aleksandr Loktionov > Reviewed-by: Vitaly Lifshits > Reviewed-by: Kurt Kanzenbach > --- > Changes: > v1->v2: > - don't fail probe when led setup fails > - rephrase subject and commit message > v1: https://lore.kernel.org/intel-wired-lan/20250906055239.29396-1-enjuk@amazon.com/ > --- > drivers/net/ethernet/intel/igc/igc.h | 1 + > drivers/net/ethernet/intel/igc/igc_main.c | 12 +++++++++--- > 2 files changed, 10 insertions(+), 3 deletions(-) > Tested-by: Mor Bar-Gabay