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wifi: mt76: mt792x: Fix a potential deadlock in high-load situations

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A deadlock may occur between two works, ps_work and mac_work, if their work
functions run simultaneously as they attempt to cancel each other by
calling cancel_delayed_work_sync().

mt792x_mac_work() ->   ...  -> cancel_delayed_work_sync(&pm->ps_work);
mt792x_pm_power_save_work() -> cancel_delayed_work_sync(&mphy->mac_work);

In high-load situations, they are queued but may not have chance to be
executed until the CPUs are released. Once the CPUs are available, there
is a high possibility that the ps_work function and mac_work function will
be executed simultaneously, resulting in a possible deadlock.

This patch replaces cancel_delayed_work_sync() with cancel_delayed_work()
in ps_work to eliminate the deadlock and make the code easier to maintain.

Signed-off-by: Leon Yen <leon.yen@mediatek.com>
Tested-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>
Link: https://patch.msgid.link/20251215122231.3180648-1-leon.yen@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Leon Yen 2025-12-15 20:22:31 +08:00 committed by Felix Fietkau
parent 1695f66232
commit bb2f07819d
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/mediatek/mt76/mt792x_mac.c
View File

@ -375,7 +375,7 @@ void mt792x_pm_power_save_work(struct work_struct *work)
}
if (!mt792x_mcu_fw_pmctrl(dev)) {
cancel_delayed_work_sync(&mphy->mac_work);
cancel_delayed_work(&mphy->mac_work);
return;
}
out: