[PATCH V8 6/7] SCSI: allow to pass null rq to scsi_prep_state_check()

[Ming Lei]

In the following patch, we will implement scsi_get_budget()
which need to call scsi_prep_state_check() when rq isn't
dequeued yet.

Signed-off-by: Ming Lei <ming....@redhat.com>
---
 drivers/scsi/scsi_lib.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 9cf6a80fe297..d159bb085714 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1301,7 +1301,7 @@ scsi_prep_state_check(struct scsi_device *sdev, struct 
request *req)
                        /*
                         * If the devices is blocked we defer normal commands.
                         */
-                       if (!(req->rq_flags & RQF_PREEMPT))
+                       if (req && !(req->rq_flags & RQF_PREEMPT))
                                ret = BLKPREP_DEFER;
                        break;
                default:
@@ -1310,7 +1310,7 @@ scsi_prep_state_check(struct scsi_device *sdev, struct 
request *req)
                         * special commands.  In particular any user initiated
                         * command is not allowed.
                         */
-                       if (!(req->rq_flags & RQF_PREEMPT))
+                       if (req && !(req->rq_flags & RQF_PREEMPT))
                                ret = BLKPREP_KILL;
                        break;
                }
-- 
2.9.5