linux-kernel - [PATCH 5.10 167/299] scsi: smartpqi: Correct request leakage during reset operations

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Date:   Mon, 10 May 2021 12:19:24 +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, Scott Teel <scott.teel@...rochip.com>,
        Scott Benesh <scott.benesh@...rochip.com>,
        Kevin Barnett <kevin.barnett@...rochip.com>,
        Murthy Bhat <Murthy.Bhat@...rochip.com>,
        Don Brace <don.brace@...rochip.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 167/299] scsi: smartpqi: Correct request leakage during reset operations

From: Murthy Bhat <Murthy.Bhat@...rochip.com>

[ Upstream commit b622a601a13ae5974c5b0aeecb990c224b8db0d9 ]

While failing queued I/Os in TMF path, there was a request leak and hence
stale entries in request pool with ref count being non-zero. In shutdown
path we have a BUG_ON to catch stuck I/O either in firmware or in the
driver. The stale requests caused a system crash. The I/O request pool
leakage also lead to a significant performance drop.

Link: https://lore.kernel.org/r/161549370379.25025.12793264112620796062.stgit@brunhilda
Reviewed-by: Scott Teel <scott.teel@...rochip.com>
Reviewed-by: Scott Benesh <scott.benesh@...rochip.com>
Reviewed-by: Kevin Barnett <kevin.barnett@...rochip.com>
Signed-off-by: Murthy Bhat <Murthy.Bhat@...rochip.com>
Signed-off-by: Don Brace <don.brace@...rochip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/smartpqi/smartpqi_init.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 9300a677510d..afd004fdce76 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -5491,6 +5491,8 @@ static void pqi_fail_io_queued_for_device(struct pqi_ctrl_info *ctrl_info,
 
 				list_del(&io_request->request_list_entry);
 				set_host_byte(scmd, DID_RESET);
+				pqi_free_io_request(io_request);
+				scsi_dma_unmap(scmd);
 				pqi_scsi_done(scmd);
 			}
 
@@ -5527,6 +5529,8 @@ static void pqi_fail_io_queued_for_all_devices(struct pqi_ctrl_info *ctrl_info)
 
 				list_del(&io_request->request_list_entry);
 				set_host_byte(scmd, DID_RESET);
+				pqi_free_io_request(io_request);
+				scsi_dma_unmap(scmd);
 				pqi_scsi_done(scmd);
 			}
 
-- 
2.30.2