From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Mon, 17 Feb 2020 19:57:07 +0000 (+0100)
Subject: fix 4.4 btrfs patch
X-Git-Tag: v4.19.105~20
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3cff846121a790bb83419125956b8b9ec31374cc;p=thirdparty%2Fkernel%2Fstable-queue.git

fix 4.4 btrfs patch
---

diff --git a/queue-4.4/btrfs-fix-race-between-using-extent-maps-and-merging-them.patch b/queue-4.4/btrfs-fix-race-between-using-extent-maps-and-merging-them.patch
index 804677192c3..7b9fc53842a 100644
--- a/queue-4.4/btrfs-fix-race-between-using-extent-maps-and-merging-them.patch
+++ b/queue-4.4/btrfs-fix-race-between-using-extent-maps-and-merging-them.patch
@@ -120,7 +120,7 @@ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 +	 * clearing the logging flag), so anything > 2 means it's being used by
 +	 * other tasks too.
 +	 */
-+	if (refcount_read(&em->refs) > 2)
++	if (atomic_read(&em->refs) > 2)
 +		return;
 +
  	if (em->start != 0) {