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mt76: mt7921: fix a leftover race in runtime-pm

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[ Upstream commit 591cdccebdd4d02eb46d400dea911136400cc567 ]

Fix a possible race in mt7921_pm_power_save_work() if rx/tx napi
schedules ps_work and we are currently accessing device register
on a different cpu.

Fixes: 1d8efc741df8 ("mt76: mt7921: introduce Runtime PM support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lorenzo Bianconi 2021-12-30 21:47:05 +01:00 committed by Greg Kroah-Hartman
parent 0f3d76144b
commit 421cb64c91
1 changed files with 8 additions and 0 deletions
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8
drivers/net/wireless/mediatek/mt76/mt7921/mac.c
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@ -1550,6 +1550,14 @@ void mt7921_pm_power_save_work(struct work_struct *work)
test_bit(MT76_HW_SCHED_SCANNING, &mphy->state))
goto out;
if (mutex_is_locked(&dev->mt76.mutex))
/* if mt76 mutex is held we should not put the device
* to sleep since we are currently accessing device
* register map. We need to wait for the next power_save
* trigger.
*/
goto out;
if (time_is_after_jiffies(dev->pm.last_activity + delta)) {
delta = dev->pm.last_activity + delta - jiffies;
goto out;