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mt76: mt7921: fix dma hang in rmmod

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The dma would be broken after rmmod flow. There are two different
cases causing this issue.
1. dma access without privilege.
2. hw access sequence borken by another context.

This patch handle both cases to avoid hw crash.

Fixes: 2b9ea5a8cf1bd ("mt76: mt7921: add mt7921_dma_cleanup in mt7921_unregister_device")
Signed-off-by: Deren Wu <[email protected]>
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Deren Wu
2021-08-13 12:26:54 +02:00
committed by Felix Fietkau
parent d04814366c
commit 4602acc927
1 changed files with 10 additions and 0 deletions
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mt7921/init.c
+10
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@@ -266,10 +266,20 @@ int mt7921_register_device(struct mt7921_dev *dev)
void mt7921_unregister_device(struct mt7921_dev *dev)
{
int i;
struct mt76_connac_pm *pm = &dev->pm;
mt76_unregister_device(&dev->mt76);
mt76_for_each_q_rx(&dev->mt76, i)
napi_disable(&dev->mt76.napi[i]);
cancel_delayed_work_sync(&pm->ps_work);
cancel_work_sync(&pm->wake_work);
mt7921_tx_token_put(dev);
mt7921_mcu_drv_pmctrl(dev);
mt7921_dma_cleanup(dev);
mt7921_mcu_exit(dev);
mt7921_mcu_fw_pmctrl(dev);
tasklet_disable(&dev->irq_tasklet);
mt76_free_device(&dev->mt76);