scsi: device_handler: alua: Call scsi_device_put() from non-atomic context

Since commit f93ed747e2c7 ("scsi: core: Release SCSI devices
synchronously"), scsi_device_put() might sleep. Avoid calling it from
alua_rtpg_queue() with the pg_lock held. The lock only pretects h->pg,
anyway. To avoid the pg being freed under us, because of a race with
another thread, take a temporary reference. In alua_rtpg_queue(), verify
that the pg still belongs to the sdev being passed before actually queueing
the RTPG.

This patch fixes the following smatch warning:

drivers/scsi/device_handler/scsi_dh_alua.c:1013 alua_rtpg_queue() warn: sleeping in atomic context

alua_check_vpd() <- disables preempt
-> alua_rtpg_queue()
   -> scsi_device_put()

Cc: Martin Wilck <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Cc: Sachin Sant <[email protected]>
Cc: Benjamin Block <[email protected]>
Suggested-by: Martin Wilck <[email protected]>
Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Tested-by: Sachin Sant <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

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