linux-kernel - [PATCH 5.4 275/314] scsi: ufs-bsg: Fix runtime PM imbalance on error

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Message-Id: <20200623195352.102621485@linuxfoundation.org>
Date:   Tue, 23 Jun 2020 21:57:50 +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, Avri Altman <avri.altman@....com>,
        Dinghao Liu <dinghao.liu@....edu.cn>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 275/314] scsi: ufs-bsg: Fix runtime PM imbalance on error

From: Dinghao Liu <dinghao.liu@....edu.cn>

[ Upstream commit a1e17eb03e69bb61bd1b1a14610436b7b9be12d9 ]

When ufs_bsg_alloc_desc_buffer() returns an error code, a pairing runtime
PM usage counter decrement is needed to keep the counter balanced.

Link: https://lore.kernel.org/r/20200522045932.31795-1-dinghao.liu@zju.edu.cn
Fixes: 74e5e468b664 (scsi: ufs-bsg: Wake the device before sending raw upiu commands)
Reviewed-by: Avri Altman <avri.altman@....com>
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/ufs/ufs_bsg.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufs_bsg.c b/drivers/scsi/ufs/ufs_bsg.c
index d2197a31abe58..bad366e491591 100644
--- a/drivers/scsi/ufs/ufs_bsg.c
+++ b/drivers/scsi/ufs/ufs_bsg.c
@@ -106,8 +106,10 @@ static int ufs_bsg_request(struct bsg_job *job)
 		desc_op = bsg_request->upiu_req.qr.opcode;
 		ret = ufs_bsg_alloc_desc_buffer(hba, job, &desc_buff,
 						&desc_len, desc_op);
-		if (ret)
+		if (ret) {
+			pm_runtime_put_sync(hba->dev);
 			goto out;
+		}
 
 		/* fall through */
 	case UPIU_TRANSACTION_NOP_OUT:
-- 
2.25.1