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scsi: sg: reset 'res_in_use' after unlinking reserved array 

Once the reserved page array is unused we can reset the 'res_in_use'
state; here we can do a lazy update without holding the mutex as we only
need to check against concurrent access, not concurrent release.

[mkp: checkpatch]

Fixes: 1bc0eb0446 ("scsi: sg: protect accesses to 'reserved' page array")
Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Hannes Reinecke 2017-04-24 10:26:36 +02:00 committed by Martin K. Petersen
parent 4bd13a0771
commit e791ce27c3
1 changed files with 2 additions and 0 deletions
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2
drivers/scsi/sg.c
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@ -2056,6 +2056,8 @@ sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
req_schp->page_order = 0;
req_schp->sglist_len = 0;
srp->res_used = 0;
/* Called without mutex lock to avoid deadlock */
sfp->res_in_use = 0;
}
static Sg_request *