[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>
This commit is contained in:
NeilBrown 2005-09-09 16:23:57 -07:00 committed by Linus Torvalds
parent a6fb0934f9
commit 9ba00538ad

View file

@ -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 */