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mt76: mt7663s: fix the possible device hang in high traffic

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[ Upstream commit 45247a8561 ]

Use the additional memory barrier to ensure the skb list up-to-date
between the skb producer and consumer to avoid the invalid skb content
written into sdio controller and then cause device hang due to mcu assert
caught by WR_TIMEOUT_INT.

Fixes: 1522ff731f ("mt76: mt7663s: introduce sdio tx aggregation")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sean Wang 2021-03-04 21:25:23 +08:00 • committed by Greg Kroah-Hartman
commit de4e60382b
2 changed files with 5 additions and 0 deletions
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2
drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c
View file

@ -201,6 +201,8 @@ static int mt7663s_tx_run_queue(struct mt76_dev *dev, enum mt76_txq_id qid)
struct mt76_queue_entry *e = &q->entry[q->first];
struct sk_buff *iter;
smp_rmb();
if (!test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state)) {
__skb_put_zero(e->skb, 4);
err = __mt7663s_xmit_queue(dev, e->skb->data,

3
drivers/net/wireless/mediatek/mt76/sdio.c
View file

@ -215,6 +215,9 @@ mt76s_tx_queue_skb(struct mt76_dev *dev, enum mt76_txq_id qid,
q->entry[q->head].skb = tx_info.skb;
q->entry[q->head].buf_sz = len;
smp_wmb();
q->head = (q->head + 1) % q->ndesc;
q->queued++;