Patch "dm io: fix duplicate bio completion due to missing ref count" 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

    dm io: fix duplicate bio completion due to missing ref count

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:
     dm-io-fix-duplicate-bio-completion-due-to-missing-ref-count.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 [off-list ref] know about it.

From feb7695fe9fb83084aa29de0094774f4c9d4c9fc Mon Sep 17 00:00:00 2001

From: Mike Snitzer <redacted>
Date: Tue, 20 Jun 2017 19:14:30 -0400
Subject: dm io: fix duplicate bio completion due to missing ref count

From: Mike Snitzer <redacted>

commit feb7695fe9fb83084aa29de0094774f4c9d4c9fc upstream.

If only a subset of the devices associated with multiple regions support
a given special operation (eg. DISCARD) then the dec_count() that is
used to set error for the region must increment the io->count.

Otherwise, when the dec_count() is called it can cause the dm-io
caller's bio to be completed multiple times.  As was reported against
the dm-mirror target that had mirror legs with a mix of discard
capabilities.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=196077
Reported-by: Zhang Yi <redacted>
Signed-off-by: Mike Snitzer <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/dm-io.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c

@@ -302,6 +302,7 @@ static void do_region(int op, int op_fla
 		special_cmd_max_sectors = q->limits.max_write_same_sectors;
 	if ((op == REQ_OP_DISCARD || op == REQ_OP_WRITE_SAME) &&
 	    special_cmd_max_sectors == 0) {
+		atomic_inc(&io->count);
 		dec_count(io, region, -EOPNOTSUPP);
 		return;
 	}

Patches currently in stable-queue which might be from snitzer@redhat.com are

queue-4.9/dm-io-fix-duplicate-bio-completion-due-to-missing-ref-count.patch