linux-kernel - [PATCH] mmc: host: Fix data stomping during mmc recovery

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Date:   Fri, 16 Sep 2022 17:05:06 +0800
From:   Wenchao Chen <wenchao.chen666@...il.com>
To:     ulf.hansson@...aro.org
Cc:     baolin.wang@...ux.alibaba.com, zhang.lyra@...il.com,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        megoo.tang@...il.com, lzx.stg@...il.com
Subject: [PATCH] mmc: host: Fix data stomping during mmc recovery

From: Wenchao Chen <wenchao.chen@...soc.com>

The block device uses multiple queues to access emmc. There will be up to 3
requests in the hsq of the host. The current code will check whether there
is a request doing recovery before entering the queue, but it will not check
whether there is a request when the lock is issued. The request is in recovery
mode. If there is a request in recovery, then a read and write request is
initiated at this time, and the conflict between the request and the recovery
request will cause the data to be trampled.

Signed-off-by: Wenchao Chen <wenchao.chen@...soc.com>
---
 drivers/mmc/host/mmc_hsq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/mmc_hsq.c b/drivers/mmc/host/mmc_hsq.c
index a5e05ed0fda3..9d35453e7371 100644
--- a/drivers/mmc/host/mmc_hsq.c
+++ b/drivers/mmc/host/mmc_hsq.c
@@ -34,7 +34,7 @@ static void mmc_hsq_pump_requests(struct mmc_hsq *hsq)
 	spin_lock_irqsave(&hsq->lock, flags);

 	/* Make sure we are not already running a request now */
-	if (hsq->mrq) {
+	if (hsq->mrq || hsq->recovery_halt) {
 		spin_unlock_irqrestore(&hsq->lock, flags);
 		return;
 	}
-- 
2.17.1