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mt76: mt7921: fix dma hang in rmmod

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[ Upstream commit a23f80aa9c ]

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: 2b9ea5a8cf ("mt76: mt7921: add mt7921_dma_cleanup in mt7921_unregister_device")
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Deren Wu
2021-07-27 17:47:09 +08:00
committed by Greg Kroah-Hartman
parent 2bfda0a8dc
commit c8c0958687
1 changed files with 9 additions and 0 deletions
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9
drivers/net/wireless/mediatek/mt76/mt7921/init.c
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@@ -251,8 +251,17 @@ 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);