This is a note to let you know that I've just added the patch titled
scsi: sg: reset 'res_in_use' after unlinking reserved array
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-sg-reset-res_in_use-after-unlinking-reserved-array.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e791ce27c3f6a1d3c746fd6a8f8e36c9540ec6f9 Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <hare@xxxxxxx>
Date: Mon, 24 Apr 2017 10:26:36 +0200
Subject: scsi: sg: reset 'res_in_use' after unlinking reserved array
From: Hannes Reinecke <hare@xxxxxxx>
commit e791ce27c3f6a1d3c746fd6a8f8e36c9540ec6f9 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: 1bc0eb044615 ("scsi: sg: protect accesses to 'reserved' page array")
Signed-off-by: Hannes Reinecke <hare@xxxxxxxx>
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: Todd Poynor <toddpoynor@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/sg.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -2052,6 +2052,8 @@ sg_unlink_reserve(Sg_fd * sfp, Sg_reques
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 *
Patches currently in stable-queue which might be from hare@xxxxxxx are
queue-4.4/scsi-sg-protect-accesses-to-reserved-page-array.patch
queue-4.4/scsi-sg-reset-res_in_use-after-unlinking-reserved-array.patch