linux-kernel - [PATCH v1] ufs: get target SQ entry within critical section

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Date: Thu,  4 Jan 2024 10:24:50 +0900
From: Kiwoong Kim <kwmad.kim@...sung.com>
To: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
	jejb@...ux.ibm.com, martin.petersen@...cle.com, beanhuo@...ron.com,
	adrian.hunter@...el.com, h10.kim@...sung.com, hy50.seo@...sung.com,
	sh425.lee@...sung.com, kwangwon.min@...sung.com, junwoo80.lee@...sung.com,
	wkon.kim@...sung.com
Cc: Kiwoong Kim <kwmad.kim@...sung.com>
Subject: [PATCH v1] ufs: get target SQ entry within critical section

In IO centric scenarios, especially during a period that
many IO requests are submitted to a same HW queue at the same
time, it's found that one reqeust overwrote a SQ entry
that had been already occupied by another request submitted
in the past. And it eventually led to command timed-out
because one of two requests were overwritten, which could not
be completed.

[   74.995185][  T176] exynos-ufs 17100000.ufs: ufshcd_abort: Device abort task at tag 30

Signed-off-by: Kiwoong Kim <kwmad.kim@...sung.com>
---
 drivers/ufs/core/ufshcd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 7bc3fc4..da1a9c0 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2199,9 +2199,10 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag,
 	if (is_mcq_enabled(hba)) {
 		int utrd_size = sizeof(struct utp_transfer_req_desc);
 		struct utp_transfer_req_desc *src = lrbp->utr_descriptor_ptr;
-		struct utp_transfer_req_desc *dest = hwq->sqe_base_addr + hwq->sq_tail_slot;
+		struct utp_transfer_req_desc *dest;
 
 		spin_lock(&hwq->sq_lock);
+		dest = hwq->sqe_base_addr + hwq->sq_tail_slot;
 		memcpy(dest, src, utrd_size);
 		ufshcd_inc_sq_tail(hwq);
 		spin_unlock(&hwq->sq_lock);
-- 
2.7.4