[PATCH v5 04/13] scsi: sr: need to check the result of scsi_execute in sr_get_events

[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/sr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 4664fdf..5c5476b 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -205,7 +205,8 @@ static unsigned int sr_get_events(struct scsi_device *sdev)

        result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
                                  &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
-       if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
+       if (driver_byte(result) == DRIVER_SENSE && scsi_sense_valid(&sshdr) &&
+           sshdr.sense_key == UNIT_ATTENTION)
                return DISK_EVENT_MEDIA_CHANGE;

        if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
--
2.7.4