scsi: core: Use scsi_cmd_to_rq() instead of scsi_cmnd.request

stable inclusion
from stable-v5.10.206
commit df83ca8e986d0285974dfa510973191547dcd173
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I8ZD3X
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.206&id=df83ca8e986d0285974dfa510973191547dcd173

-------------------------

[ Upstream commit aa8e25e5 ]

Prepare for removal of the request pointer by using scsi_cmd_to_rq()
instead. Cast away constness where necessary when passing a SCSI command
pointer to scsi_cmd_to_rq(). This patch does not change any functionality.

Link: https://lore.kernel.org/r/20210809230355.8186-3-bvanassche@acm.org


Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Stable-dep-of: 066c5b46b6ea ("scsi: core: Always send batch on reset or error handling command")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>
(cherry picked from commit a8a57828)