Patch "scsi: sg: reset 'res_in_use' after unlinking reserved array" has been added to the 4.9-stable tree

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 4.9-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-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Hannes Reinecke <[email protected]>
Date: Mon, 24 Apr 2017 10:26:36 +0200
Subject: scsi: sg: reset 'res_in_use' after unlinking reserved array

From: Hannes Reinecke <[email protected]>

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]

---
 drivers/scsi/sg.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -2042,6 +2042,8 @@ 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 [email protected] are

queue-4.9/scsi-sg-protect-accesses-to-reserved-page-array.patch queue-4.9/scsi-sg-reset-res_in_use-after-unlinking-reserved-array.patch