A race between scanning and fc_remote_port_delete() may result in a
permanent stop if the device gets blocked before scsi_sysfs_add_sdev()
and unblocked after.  The reason is that blocking a device sets both
the SDEV_BLOCKED state and the QUEUE_FLAG_STOPPED.  However,
scsi_sysfs_add_sdev() unconditionally sets SDEV_RUNNING which causes
the device to be ignored by scsi_target_unblock() and thus never have
its QUEUE_FLAG_STOPPED cleared leading to a device which is apparently
running but has a stopped queue.

We actually have two places where SDEV_RUNNING is set: once in
scsi_add_lun() which respects the blocked flag and once in
scsi_sysfs_add_sdev() which doesn't.  Since the second set is entirely
spurious, simply remove it to fix the problem.

Reported-by: Zengxi Chen <chenzen...@huawei.com>
Signed-off-by: Wei Fang <fangw...@huawei.com>
Reviewed-by: Ewan D. Milne <emi...@redhat.com>
---
Changes v1->v2:
- don't modify scsi_internal_device_unblock(), just remove changing
  state to SDEV_RUNNING in scsi_sysfs_add_sdev(), suggested by
  James Bottomley and Ewan D. Milne.
Changes v2->v3
- Use a clearer description of this problem
Changes v3->v4
- Remove useless change of comment about SDEV_RUNNING

 drivers/scsi/scsi_sysfs.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 0734927..82dfe07 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1204,10 +1204,6 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
        struct request_queue *rq = sdev->request_queue;
        struct scsi_target *starget = sdev->sdev_target;
 
-       error = scsi_device_set_state(sdev, SDEV_RUNNING);
-       if (error)
-               return error;
-
        error = scsi_target_add(starget);
        if (error)
                return error;
-- 
2.4.11

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