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From: Can Guo <cang@codeaurora.org>
To: asutoshd@codeaurora.org, nguyenb@codeaurora.org,
	hongwus@codeaurora.org, linux-scsi@vger.kernel.org,
	kernel-team@android.com, cang@codeaurora.org
Cc: Alim Akhtar <alim.akhtar@samsung.com>,
	Avri Altman <avri.altman@wdc.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Stanley Chu <stanley.chu@mediatek.com>,
	Bean Huo <beanhuo@micron.com>, Jaegeuk Kim <jaegeuk@kernel.org>,
	Bart Van Assche <bvanassche@acm.org>,
	linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v5 1/2] scsi: ufs: Fix task management request completion timeout
Date: Thu,  1 Apr 2021 00:39:08 -0700	[thread overview]
Message-ID: <1617262750-4864-2-git-send-email-cang@codeaurora.org> (raw)
In-Reply-To: <1617262750-4864-1-git-send-email-cang@codeaurora.org>

ufshcd_tmc_handler() calls blk_mq_tagset_busy_iter(fn = ufshcd_compl_tm()),
but since blk_mq_tagset_busy_iter() only iterates over all reserved tags
and requests which are not in IDLE state, ufshcd_compl_tm() never gets a
chance to run. Thus, TMR always ends up with completion timeout. Fix it by
calling blk_mq_start_request() in  __ufshcd_issue_tm_cmd().

Fixes: 69a6c269c097 ("scsi: ufs: Use blk_{get,put}_request() to allocate and free TMFs")

Signed-off-by: Can Guo <cang@codeaurora.org>
---
 drivers/scsi/ufs/ufshcd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index b49555fa..d4f8cb2 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6464,6 +6464,7 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
 
 	spin_lock_irqsave(host->host_lock, flags);
 	task_tag = hba->nutrs + free_slot;
+	blk_mq_start_request(req);
 
 	treq->req_header.dword_0 |= cpu_to_be32(task_tag);
 
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.


  reply	other threads:[~2021-04-01  7:39 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-01  7:39 [PATCH v5 0/2] Two fixes for task management request implementation Can Guo
2021-04-01  7:39 ` Can Guo [this message]
2021-04-02  0:09   ` [PATCH v5 1/2] scsi: ufs: Fix task management request completion timeout Bart Van Assche
2021-04-01  7:39 ` [PATCH v5 2/2] scsi: ufs: Fix wrong Task Tag used in task management request UPIUs Can Guo
2021-04-02  3:54 ` [PATCH v5 0/2] Two fixes for task management request implementation Martin K. Petersen

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