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wifi: mt76: mt7921s: fix potential hung tasks during chip recovery

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During chip recovery (e.g. chip reset), there is a possible situation that
kernel worker reset_work is holding the lock and waiting for kernel thread
stat_worker to be parked, while stat_worker is waiting for the release of
the same lock.
It causes a deadlock resulting in the dumping of hung tasks messages and
possible rebooting of the device.

This patch prevents the execution of stat_worker during the chip recovery.

Signed-off-by: Leon Yen <[email protected]>
Signed-off-by: Ming Yen Hsieh <[email protected]>
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Leon Yen
2024-04-03 12:39:12 +02:00
committed by Felix Fietkau
parent 5b7616491f
commit 0436995fec
4 changed files with 4 additions and 5 deletions
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sdio.c
+2 -1
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@@ -499,7 +499,8 @@ static void mt76s_tx_status_data(struct mt76_worker *worker)
dev = container_of(sdio, struct mt76_dev, sdio);
while (true) {
if (test_bit(MT76_REMOVED, &dev->phy.state))
if (test_bit(MT76_RESET, &dev->phy.state) ||
test_bit(MT76_REMOVED, &dev->phy.state))
break;
if (!dev->drv->tx_status_data(dev, &update))