From: Murthy Bhat Murthy.Bhat@microchip.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@brun... Reviewed-by: Scott Teel scott.teel@microchip.com Reviewed-by: Scott Benesh scott.benesh@microchip.com Reviewed-by: Kevin Barnett kevin.barnett@microchip.com Signed-off-by: Murthy Bhat Murthy.Bhat@microchip.com Signed-off-by: Don Brace don.brace@microchip.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.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 3795804ea869..52e4d5618dc7 100644 --- a/drivers/scsi/smartpqi/smartpqi_init.c +++ b/drivers/scsi/smartpqi/smartpqi_init.c @@ -5488,6 +5488,8 @@ 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); }
@@ -5524,6 +5526,8 @@ 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); }