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From:   NeilBrown <neilb@suse.com>
To:     Jeff Layton <jlayton@kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>
Date:   Mon, 12 Nov 2018 12:14:49 +1100
Subject: [PATCH 04/12] gfs2: properly initial file_lock used for unlock.
Cc:     "J. Bruce Fields" <bfields@fieldses.org>,
        Martin Wilck <mwilck@suse.de>, linux-fsdevel@vger.kernel.org,
        Frank Filz <ffilzlnx@mindspring.com>,
        linux-kernel@vger.kernel.org
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Rather than assuming all-zeros is sufficient, use the available API to
initialize the file_lock structure use for unlock.
VFS-level changes will soon make it important that the
list_heads in file_lock are always properly initialized.

Signed-off-by: NeilBrown <neilb@suse.com>
---
 fs/gfs2/file.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 45a17b770d97..a2dea5bc0427 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -1199,13 +1199,13 @@ static int do_flock(struct file *file, int cmd, struct file_lock *fl)
 	mutex_lock(&fp->f_fl_mutex);
 
 	if (gfs2_holder_initialized(fl_gh)) {
+		struct file_lock request;
 		if (fl_gh->gh_state == state)
 			goto out;
-		locks_lock_file_wait(file,
-				     &(struct file_lock) {
-					     .fl_type = F_UNLCK,
-					     .fl_flags = FL_FLOCK
-				     });
+		locks_init_lock(&request);
+		request.fl_type = F_UNLCK;
+		request.fl_flags = FL_FLOCK;
+		locks_lock_file_wait(file, &request);
 		gfs2_glock_dq(fl_gh);
 		gfs2_holder_reinit(state, flags, fl_gh);
 	} else {