[PATCH 5.19 224/717] wifi: rtw89: pci: fix interrupt stuck after leaving low power mode

[Greg Kroah-Hartman]

From: Ping-Ke Shih <pkshih@xxxxxxxxxxx>

[ Upstream commit b7e715d3dcd2e9fa3a689ba0dd7ab85f8aaf6e9a ]

We turn off interrupt in ISR, and re-enable interrupt in threadfn or
napi_poll according to the mode it stays. If we are turning off interrupt,
rtwpci->running flag is unset and interrupt handler stop processing even
if it was called, so disallow to re-enable interrupt in this situation.
Or, wifi chip doesn't trigger interrupt events anymore because interrupt
status (ISR) isn't clear by interrupt handler anymore.

Fixes: c83dcd0508e2 ("rtw89: pci: add a separate interrupt handler for low power mode")
Signed-off-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220824063312.15784-1-pkshih@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/wireless/realtek/rtw89/pci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtw89/pci.c b/drivers/net/wireless/realtek/rtw89/pci.c
index 0ef7821b2e0f..622f95bc3ffc 100644
--- a/drivers/net/wireless/realtek/rtw89/pci.c
+++ b/drivers/net/wireless/realtek/rtw89/pci.c
@@ -756,7 +756,8 @@ static irqreturn_t rtw89_pci_interrupt_threadfn(int irq, void *dev)
 
 enable_intr:
 	spin_lock_irqsave(&rtwpci->irq_lock, flags);
-	rtw89_chip_enable_intr(rtwdev, rtwpci);
+	if (likely(rtwpci->running))
+		rtw89_chip_enable_intr(rtwdev, rtwpci);
 	spin_unlock_irqrestore(&rtwpci->irq_lock, flags);
 	return IRQ_HANDLED;
 }
-- 
2.35.1