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

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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 <[email protected]>
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Lorenzo Bianconi
2022-01-14 14:25:55 +01:00
committed by Felix Fietkau
parent dc8e2e8dcd
commit 7063127f85
1 changed files with 8 additions and 0 deletions
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mt7921/mac.c
+8
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@@ -1553,6 +1553,14 @@ void mt7921_pm_power_save_work(struct work_struct *work)
dev->fw_assert)
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;