linux-kernel - [PATCH 4.4 18/36] scsi: ufs: Release clock if DMA map fails

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Date:   Tue,  9 Jun 2020 19:44:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bean Huo <beanhuo@...ron.com>,
        Can Guo <cang@...eaurora.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH 4.4 18/36] scsi: ufs: Release clock if DMA map fails

From: Can Guo <cang@...eaurora.org>

commit 17c7d35f141ef6158076adf3338f115f64fcf760 upstream.

In queuecommand path, if DMA map fails, it bails out with clock held.  In
this case, release the clock to keep its usage paired.

[mkp: applied by hand]

Link: https://lore.kernel.org/r/0101016ed3d66395-1b7e7fce-b74d-42ca-a88a-4db78b795d3b-000000@us-west-2.amazonses.com
Reviewed-by: Bean Huo <beanhuo@...ron.com>
Signed-off-by: Can Guo <cang@...eaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
[EB: resolved cherry-pick conflict caused by newer kernels not having
 the clear_bit_unlock() line]
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/ufs/ufshcd.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1374,6 +1374,7 @@ static int ufshcd_queuecommand(struct Sc
 	ufshcd_compose_upiu(hba, lrbp);
 	err = ufshcd_map_sg(lrbp);
 	if (err) {
+		ufshcd_release(hba);
 		lrbp->cmd = NULL;
 		clear_bit_unlock(tag, &hba->lrb_in_use);
 		goto out;