Commit b7571624 authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Greg Kroah-Hartman

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

commit e791ce27 upstream.

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: 1bc0eb04 ("scsi: sg: protect accesses to 'reserved' page array")
Signed-off-by: default avatarHannes Reinecke <hare@suse.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Cc: Todd Poynor <toddpoynor@google.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a4075bbb
......@@ -2052,6 +2052,8 @@ sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
req_schp->sglist_len = 0;
sfp->save_scat_len = 0;
srp->res_used = 0;
/* Called without mutex lock to avoid deadlock */
sfp->res_in_use = 0;
}
static Sg_request *
......
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