6.16-stable review patch. If anyone has any objections, please let me know.
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From: Kohei Enju enjuk@amazon.com
[ Upstream commit 528eb4e19ec0df30d0c9ae4074ce945667dde919 ]
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: <TASK> 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 enjuk@amazon.com Reviewed-by: Paul Menzel pmenzel@molgen.mpg.de Reviewed-by: Aleksandr Loktionov aleksandr.loktionov@intel.com Reviewed-by: Vitaly Lifshits vitaly.lifshits@intel.com Reviewed-by: Kurt Kanzenbach kurt@linutronix.de Tested-by: Mor Bar-Gabay morx.bar.gabay@intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/igc/igc.h | 1 + drivers/net/ethernet/intel/igc/igc_main.c | 12 +++++++++--- 2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h index 859a15e4ccbab..1bbe7f72757c0 100644 --- a/drivers/net/ethernet/intel/igc/igc.h +++ b/drivers/net/ethernet/intel/igc/igc.h @@ -343,6 +343,7 @@ struct igc_adapter { /* LEDs */ struct mutex led_mutex; struct igc_led_classdev *leds; + bool leds_available; };
void igc_up(struct igc_adapter *adapter); diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index 1b4465d6b2b72..5b8f9b5121489 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -7301,8 +7301,14 @@ static int igc_probe(struct pci_dev *pdev,
if (IS_ENABLED(CONFIG_IGC_LEDS)) { err = igc_led_setup(adapter); - if (err) - goto err_register; + if (err) { + netdev_warn_once(netdev, + "LED init failed (%d); continuing without LED support\n", + err); + adapter->leds_available = false; + } else { + adapter->leds_available = true; + } }
return 0; @@ -7358,7 +7364,7 @@ static void igc_remove(struct pci_dev *pdev) cancel_work_sync(&adapter->watchdog_task); hrtimer_cancel(&adapter->hrtimer);
- if (IS_ENABLED(CONFIG_IGC_LEDS)) + if (IS_ENABLED(CONFIG_IGC_LEDS) && adapter->leds_available) igc_led_free(adapter);
/* Release control of h/w to f/w. If f/w is AMT enabled, this