scsi: core: Allow the state change from SDEV_QUIESCE to SDEV_BLOCK

The APIs scsi_host_block()/scsi_host_unblock() were recently added by
commit 2bb9558 ("scsi: core: add scsi_host_(block,unblock) helper
function") and so far the APIs are only used by: commit 3d3ca53
("scsi: aacraid: use scsi_host_(block,unblock) to block I/O").

However, from reading the code, I think the APIs don't really work for
aacraid, because, in the resume path of hibernation, when aac_suspend() ->
scsi_host_block() is called, scsi_device_quiesce() has set the state to
SDEV_QUIESCE, so aac_suspend() -> scsi_host_block() returns -EINVAL.

Fix the issue by allowing the state change.

Link: https://lore.kernel.org/r/[email protected]
Fixes: 2bb9558 ("scsi: core: add scsi_host_(block,unblock) helper function")
Reviewed-by: Ewan D. Milne <[email protected]>
Reviewed-by: Ming Lei <[email protected]>
Signed-off-by: Dexuan Cui <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: dcui

drivers/scsi/scsi_lib.c

@@ -2284,6 +2284,7 @@ scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state)
 		switch (oldstate) {
 		case SDEV_RUNNING:
 		case SDEV_CREATED_BLOCK:
+		case SDEV_QUIESCE:
 		case SDEV_OFFLINE:
 			break;
 		default: