[ Upstream commit
5f54237ad798f41cb6a503271aa9ca47188cfb9b ]
Ensure the entry has been fully updated before SDIO bus worker access
it. This patch would fix potential memory risk in both mt7663s and
mt7921s.
Fixes:
764dee47e2c1 ("mt76: sdio: move common code in mt76_sdio module")
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
q->entry[q->head].buf_sz = len;
q->entry[q->head].skb = skb;
+
+ /* ensure the entry fully updated before bus access */
+ smp_wmb();
+
q->head = (q->head + 1) % q->ndesc;
q->queued++;