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[PATCH] md: ensure bitmap_writeback_daemon handles shutdown properly.

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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
1 changed files with 3 additions and 0 deletions
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3
drivers/md/bitmap.c
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@ -1156,6 +1156,9 @@ static void bitmap_writeback_daemon(mddev_t *mddev)
err = -EINTR; err = -EINTR;
goto out; goto out;
} }
if (bitmap == NULL)
/* about to be stopped. */
return;
PRINTK("%s: bitmap writeback daemon woke up...\n", bmname(bitmap)); PRINTK("%s: bitmap writeback daemon woke up...\n", bmname(bitmap));
/* wait on bitmap page writebacks */ /* wait on bitmap page writebacks */