[Qemu-devel] [PATCH v4 1/9] block: Drop useless bdrv_new() call

From: Max Reitz <mreitz@redhat.com>
To: qemu-block@nongnu.org
Cc: qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>,
	Kevin Wolf <kwolf@redhat.com>, Alberto Garcia <berto@igalia.com>
Subject: [Qemu-devel] [PATCH v4 1/9] block: Drop useless bdrv_new() call
Date: Tue, 17 May 2016 16:41:26 +0200	[thread overview]
Message-ID: <1463496094-21608-2-git-send-email-mreitz@redhat.com> (raw)
In-Reply-To: <1463496094-21608-1-git-send-email-mreitz@redhat.com>

bdrv_append_temp_snapshot() uses bdrv_new() to create an empty BDS
before invoking bdrv_open() on that BDS. This is probably a relict from
when it used to do some modifications on that empty BDS, but now that is
unnecessary, so we can just set bs_snapshot to NULL and let bdrv_open()
do the rest.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/block.c b/block.c
index cbc10f7..d2ecf93 100644
--- a/block.c
+++ b/block.c
@@ -1470,8 +1470,7 @@ static int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags,
     qdict_put(snapshot_options, "driver",
               qstring_from_str("qcow2"));
 
-    bs_snapshot = bdrv_new();
-
+    bs_snapshot = NULL;
     ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options,
                     flags, &local_err);
     snapshot_options = NULL;
-- 
2.8.2
