FAILED: patch "[PATCH] scsi: ufs: core: Remove completed-without-interrupt path in ufshcd_abort()" failed to apply to 5.15-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 7cfdfdd6557906fd09cf0a9a564a07012e7fb0c1
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107061120-failed-5.15-7cfdfdd65579@kernel.org' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 7cfdfdd6557906fd09cf0a9a564a07012e7fb0c1 Mon Sep 17 00:00:00 2001
From: Stanley Jhu <stanleyjhu@google.com>
Date: Thu, 22 Oct 2026 11:44:42 +0800
Subject: [PATCH] scsi: ufs: core: Remove completed-without-interrupt path in
 ufshcd_abort()

In SDB mode, a command that times out right as the controller finishes it
can be completed twice:

 1. The command times out and scsi_timeout() schedules ufshcd_abort().

 2. The controller finishes the command and clears its doorbell bit in
    REG_UTP_TRANSFER_REQ_DOOR_BELL, while the completion handler has not
    yet cleared BIT(tag) in hba->outstanding_reqs.

 3. ufshcd_abort() sees the doorbell bit clear and calls
    __ufshcd_transfer_req_compl() without clearing BIT(tag) in
    hba->outstanding_reqs.

 4. The normal completion handler or the logical unit reset that follows
    sees BIT(tag) still set in hba->outstanding_reqs and completes the same
    command a second time.

This branch only exists for a rare corner case, a completion interrupt that
is lost or arrives late. Remove it to simplify the abort path and leave
such a command to the SCSI error handler, like any other command that
cannot be aborted. The cost is a slower recovery in this corner case, which
is acceptable since it only happens after a timeout.

Fixes: 169f5eb28869 ("scsi: ufs: Optimize SCSI command processing")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/fdb5c391-01ef-4a23-94c2-4f3853909348@acm.org
Signed-off-by: Stanley Jhu <stanleyjhu@google.com>
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/20261022034443.3034432-6-stanleyjhu@google.com
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>
---
 drivers/ufs/core/ufshcd.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 6cb5767b69fdf..834c7f3b592e3 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8125,15 +8125,6 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
 	}
 	hba->req_abort_count++;
 
-	if (!hba->mcq_enabled && !(reg & (1 << tag))) {
-		/* only execute this code in single doorbell mode */
-		dev_err(hba->dev,
-		"%s: cmd was completed, but without a notifying intr, tag = %d",
-		__func__, tag);
-		__ufshcd_transfer_req_compl(hba, 1UL << tag);
-		goto release;
-	}
-
 	/*
 	 * Task abort to the device W-LUN is illegal. When this command
 	 * will fail, due to spec violation, scsi err handling next step
-- 
2.53.0