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authorNeilBrown <neilb@cse.unsw.edu.au>2005-09-09 16:23:57 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 16:39:13 -0700
commit9ba00538ada7ecb4fb8bd71ba734a8eada987817 (patch)
tree47544958a5564856d7225a2dc4040637d731c39d
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>
-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 90fe70d76a3..87145faac49 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1156,6 +1156,9 @@ static void bitmap_writeback_daemon(mddev_t *mddev)
err = -EINTR;
goto out;
}
+ if (bitmap == NULL)
+ /* about to be stopped. */
+ return;
PRINTK("%s: bitmap writeback daemon woke up...\n", bmname(bitmap));
/* wait on bitmap page writebacks */