From: Joe Thornber <ejt@redhat.com>
Date: Fri, 27 Jul 2012 14:08:06 +0000 (+0100)
Subject: dm persistent data: always unlock superblock in dm_bm_flush_and_unlock
X-Git-Tag: upstream/snapshot3+hdmi~6928^2~34
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8d44c98aac540cdf3cb5385bc6ef8d56930c7d70;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

dm persistent data: always unlock superblock in dm_bm_flush_and_unlock

Unlock the superblock even if initial dm_bufio_write_dirty_buffers fails.

Also, remove redundant flush calls.  dm_bm_flush_and_unlock's calls to
dm_bufio_write_dirty_buffers already result in dm_bufio_issue_flush
being called.

This avoids warnings about unflushed dirty buffers from bufio.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

diff --git a/drivers/md/persistent-data/dm-block-manager.c b/drivers/md/persistent-data/dm-block-manager.c
index 0317ecd..8ec46dd 100644
--- a/drivers/md/persistent-data/dm-block-manager.c
+++ b/drivers/md/persistent-data/dm-block-manager.c
@@ -587,22 +587,14 @@ int dm_bm_flush_and_unlock(struct dm_block_manager *bm,
 	int r;
 
 	r = dm_bufio_write_dirty_buffers(to_bufio(bm));
-	if (unlikely(r))
-		return r;
-	r = dm_bufio_issue_flush(to_bufio(bm));
-	if (unlikely(r))
+	if (unlikely(r)) {
+		dm_bm_unlock(superblock);
 		return r;
+	}
 
 	dm_bm_unlock(superblock);
 
-	r = dm_bufio_write_dirty_buffers(to_bufio(bm));
-	if (unlikely(r))
-		return r;
-	r = dm_bufio_issue_flush(to_bufio(bm));
-	if (unlikely(r))
-		return r;
-
-	return 0;
+	return dm_bufio_write_dirty_buffers(to_bufio(bm));
 }
 
 u32 dm_bm_checksum(const void *data, size_t len, u32 init_xor)