[PATCH v5 02/13] scsi: core: need to check the result of scsi_execute in scsi_test_unit_ready

[zhengbin]

Like sd_pr_command, before use sshdr, we need to check the result
of scsi_execute.

Signed-off-by: zhengbin <zhengbi...@huawei.com>
---
 drivers/scsi/scsi_lib.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 5447738..2970190 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2216,6 +2216,9 @@ scsi_test_unit_ready(struct scsi_device *sdev, int 
timeout, int retries,
        do {
                result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0, sshdr,
                                          timeout, 1, NULL);
+               if (driver_byte(result) != DRIVER_SENSE)
+                       break;
+
                if (sdev->removable && scsi_sense_valid(sshdr) &&
                    sshdr->sense_key == UNIT_ATTENTION)
                        sdev->changed = 1;
--
2.7.4