[PATCH] scsi: sd: Have scsi-ml retry START_STOP errors

[Yihang Li]

When sending START_STOP commands to resume scsi_device, it may be
interrupted by exception operations such as host reset or PCI FLR. Once
the command of START_STOP is failed, the runtime_status of scsi device
will be error and it is difficult for user to recover it.

So try more retries to increase robustness as the process of command
START_STOP.

Signed-off-by: Yihang Li <liyihang9@xxxxxxxxxx>
---
 drivers/scsi/sd.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 5cd88a8eea73..29f30407d713 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -4088,9 +4088,20 @@ static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
 {
 	unsigned char cmd[6] = { START_STOP };	/* START_VALID */
 	struct scsi_sense_hdr sshdr;
+	struct scsi_failure failure_defs[] = {
+		{
+			.allowed = 3,
+			.result = SCMD_FAILURE_RESULT_ANY,
+		},
+		{}
+	};
+	struct scsi_failures failures = {
+		.failure_definitions = failure_defs,
+	};
 	const struct scsi_exec_args exec_args = {
 		.sshdr = &sshdr,
 		.req_flags = BLK_MQ_REQ_PM,
+		.failures = &failures,
 	};
 	struct scsi_device *sdp = sdkp->device;
 	int res;
-- 
2.33.0