From: <sean.wang@mediatek.com>
To: <nbd@nbd.name>, <lorenzo.bianconi@redhat.com>
Cc: <sean.wang@mediatek.com>, <linux-wireless@vger.kernel.org>,
<linux-mediatek@lists.infradead.org>
Subject: [PATCH 3/3] mt76: mt7663s: fix the possible device hang in high traffic
Date: Thu, 4 Mar 2021 21:25:23 +0800 [thread overview]
Message-ID: <99976d786b85749243af3a3a32886d5fe94d11ac.1614863741.git.objelf@gmail.com> (raw)
In-Reply-To: <801a2aa986f5486a0e789065feef7b77c612ea7b.1614863741.git.objelf@gmail.com>
From: Sean Wang <sean.wang@mediatek.com>
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: 1522ff731f84 ("mt76: mt7663s: introduce sdio tx aggregation")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
---
drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c | 2 ++
drivers/net/wireless/mediatek/mt76/sdio.c | 3 +++
2 files changed, 5 insertions(+)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c b/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c
index 2d3b7d1e2c92..29e510d263fc 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c
@@ -225,6 +225,8 @@ static int mt7663s_tx_run_queue(struct mt76_dev *dev, struct mt76_queue *q)
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,
diff --git a/drivers/net/wireless/mediatek/mt76/sdio.c b/drivers/net/wireless/mediatek/mt76/sdio.c
index 0b6facb17ff7..a18d2896ee1f 100644
--- a/drivers/net/wireless/mediatek/mt76/sdio.c
+++ b/drivers/net/wireless/mediatek/mt76/sdio.c
@@ -256,6 +256,9 @@ mt76s_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q,
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++;
--
2.25.1
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prev parent reply other threads:[~2021-03-04 13:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-04 13:25 [PATCH 1/3] mt76: mt7663: fix when beacon filter is being applied sean.wang
2021-03-04 13:25 ` [PATCH 2/3] mt76: mt7663s: make all of packets 4-bytes aligned in sdio tx aggregation sean.wang
2021-03-04 13:38 ` Lorenzo Bianconi
2021-03-04 13:25 ` sean.wang [this message]
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