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-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 */