netdev - [PATCH AUTOSEL 4.19 43/66] ath10k: start recovery process when read int status fail for sdio

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Date:   Sat, 11 Apr 2020 19:11:40 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Wen Gong <wgong@...eaurora.org>, Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 43/66] ath10k: start recovery process when read int status fail for sdio

From: Wen Gong <wgong@...eaurora.org>

[ Upstream commit 37b7ecb75627699e96750db1e0c5ac56224245df ]

When running simulate crash stress test, it happened
"failed to read from address 0x800: -110".

Test steps:
1. Run command continuous
echo soft > /sys/kernel/debug/ieee80211/phy0/ath10k/simulate_fw_crash

2. error happened and it did not begin recovery for long time.
[74377.334846] ath10k_sdio mmc1:0001:1: simulating soft firmware crash
[74378.378217] ath10k_sdio mmc1:0001:1: failed to read from address 0x800: -110
[74378.378371] ath10k_sdio mmc1:0001:1: failed to process pending SDIO interrupts: -110

It has sdio errors since it can not read MBOX_HOST_INT_STATUS_ADDRESS,
then it has to do recovery process to recovery ath10k.

Tested with QCA6174 SDIO with firmware WLAN.RMH.4.4.1-00042.

Signed-off-by: Wen Gong <wgong@...eaurora.org>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/ath/ath10k/sdio.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c
index 0cdaecb0e28a9..1606bd71f3834 100644
--- a/drivers/net/wireless/ath/ath10k/sdio.c
+++ b/drivers/net/wireless/ath/ath10k/sdio.c
@@ -915,8 +915,11 @@ static int ath10k_sdio_mbox_read_int_status(struct ath10k *ar,
 	 */
 	ret = ath10k_sdio_read(ar, MBOX_HOST_INT_STATUS_ADDRESS,
 			       irq_proc_reg, sizeof(*irq_proc_reg));
-	if (ret)
+	if (ret) {
+		queue_work(ar->workqueue, &ar->restart_work);
+		ath10k_warn(ar, "read int status fail, start recovery\n");
 		goto out;
+	}

 	/* Update only those registers that are enabled */
 	*host_int_status = irq_proc_reg->host_int_status &
-- 
2.20.1