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authorNeilBrown <neilb@cse.unsw.edu.au>2005-09-09 19:23:57 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 19:39:13 -0400
commit9ba00538ada7ecb4fb8bd71ba734a8eada987817 (patch)
tree47544958a5564856d7225a2dc4040637d731c39d /drivers/md
parenta6fb0934f923f889055152cb0b033674f627460b (diff)
[PATCH] md: ensure bitmap_writeback_daemon handles shutdown properly.
mddev->bitmap gets clearred before the writeback daemon is stopped. So the write_back daemon needs to be careful not to dereference the 'bitmap' if it is NULL. Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bitmap.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 90fe70d76a31..87145faac491 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1156,6 +1156,9 @@ static void bitmap_writeback_daemon(mddev_t *mddev)
1156 err = -EINTR; 1156 err = -EINTR;
1157 goto out; 1157 goto out;
1158 } 1158 }
1159 if (bitmap == NULL)
1160 /* about to be stopped. */
1161 return;
1159 1162
1160 PRINTK("%s: bitmap writeback daemon woke up...\n", bmname(bitmap)); 1163 PRINTK("%s: bitmap writeback daemon woke up...\n", bmname(bitmap));
1161 /* wait on bitmap page writebacks */ 1164 /* wait on bitmap page writebacks */