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From: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
To: adrian.hunter@intel.com, ulf.hansson@linaro.org
Cc: stummala@codeaurora.org, linux-mmc@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	Veerabhadrarao Badiganti <vbadigan@codeaurora.org>,
	<stable@vger.kernel.org>, Baolin Wang <baolin.wang@linaro.org>,
	Avri Altman <avri.altman@wdc.com>,
	Chaotian Jing <chaotian.jing@mediatek.com>,
	Arnd Bergmann <arnd@arndb.de>
Subject: [PATCH V1 1/2] mmc: core: Check request type before completing the request
Date: Wed,  6 May 2020 20:04:02 +0530
Message-ID: <1588775643-18037-2-git-send-email-vbadigan@codeaurora.org> (raw)
In-Reply-To: <1588775643-18037-1-git-send-email-vbadigan@codeaurora.org>

In the request completion path with CQE, request type is being checked
after the request is getting completed. This is resulting in returning
the wrong request type and leading to the IO hang issue.

ASYNC request type is getting returned for DCMD type requests.
Because of this mismatch, mq->cqe_busy flag is never getting cleared
and the driver is not invoking blk_mq_hw_run_queue. So requests are not
getting dispatched to the LLD from the block layer.

All these eventually leading to IO hang issues.
So, get the request type before completing the request.

Cc: <stable@vger.kernel.org> # v4.19+
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
---
 drivers/mmc/core/block.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 8499b56..c5367e2 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1370,6 +1370,7 @@ static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req)
 	struct mmc_request *mrq = &mqrq->brq.mrq;
 	struct request_queue *q = req->q;
 	struct mmc_host *host = mq->card->host;
+	enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
 	unsigned long flags;
 	bool put_card;
 	int err;
@@ -1399,7 +1400,7 @@ static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req)
 
 	spin_lock_irqsave(&mq->lock, flags);
 
-	mq->in_flight[mmc_issue_type(mq, req)] -= 1;
+	mq->in_flight[issue_type] -= 1;
 
 	put_card = (mmc_tot_in_flight(mq) == 0);
 
-- 
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project

  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-06 14:34 [PATCH V1 0/2] CQE fixes Veerabhadrarao Badiganti
2020-05-06 14:34 ` Veerabhadrarao Badiganti [this message]
2020-05-06 17:06   ` [PATCH V1 1/2] mmc: core: Check request type before completing the request Adrian Hunter
2020-05-08  8:12   ` Ulf Hansson
2020-05-06 14:34 ` [PATCH V1 2/2] mmc: core: Fix recursive locking issue in CQE recovery path Veerabhadrarao Badiganti
2020-05-07 11:48   ` Adrian Hunter
2020-05-07 14:06     ` [PATCH] mmc: block: Fix request completion in the CQE timeout path Adrian Hunter
2020-05-08  5:25       ` Ulf Hansson
2020-05-08  6:22         ` [PATCH RESEND] " Adrian Hunter
2020-05-08  8:17           ` Ulf Hansson
2020-05-07 16:15   ` [PATCH V2] mmc: core: Fix recursive locking issue in CQE recovery path Veerabhadrarao Badiganti
2020-05-07 17:21     ` Adrian Hunter
2020-05-08  8:12     ` Ulf Hansson

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