[PATCH 10/10] wifi: mt76: mt7996: add sanity check for NAPI schedule

[Shayne Chen]

From: Henry Yen <henry.yen at mediatek.com>

It's observed that host driver might occasionally receive
interrupts from unexpected Rx ring, whose Rx NAPI hasn't been
prepared yet. Under such situation, __napi_poll crash issue
would occur, so we add a sanity check to prevent it.

Without this patch, we might encounter kernel crash issue
especially in WED-on & RRO-on software path.

Signed-off-by: Henry Yen <henry.yen at mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen at mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7996/mmio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mmio.c b/drivers/net/wireless/mediatek/mt76/mt7996/mmio.c
index 304e5fd14803..6de5b7de4ac8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mmio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mmio.c
@@ -560,7 +560,7 @@ static void mt7996_irq_tasklet(struct tasklet_struct *t)
 		napi_schedule(&dev->mt76.tx_napi);
 
 	for (i = 0; i < __MT_RXQ_MAX; i++) {
-		if ((intr & MT_INT_RX(i)))
+		if ((intr & MT_INT_RX(i)) && dev->mt76.napi[i].poll)
 			napi_schedule(&dev->mt76.napi[i]);
 	}
 
-- 
2.39.2