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mt76: mt7615: fix a leftover race in runtime-pm

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Fix a possible race in mt7615_pm_power_save_work() if rx/tx napi
schedules ps_work and we are currently accessing device register
on a different cpu.

Fixes: db928f1ab9 ("mt76: mt7663: rely on mt76_connac_pm_ref/mt76_connac_pm_unref in tx/rx napi")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Lorenzo Bianconi
2021-12-30 21:47:06 +01:00
committed by Felix Fietkau
parent 591cdccebd
commit 42ce8d3b62
1 changed files with 8 additions and 0 deletions
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8
drivers/net/wireless/mediatek/mt76/mt7615/mac.c
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@@ -2131,6 +2131,14 @@ void mt7615_pm_power_save_work(struct work_struct *work)
test_bit(MT76_HW_SCHED_SCANNING, &dev->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;