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@xxxxxxxxxxxxxxx>
### Diffstat output
./drivers/md/bitmap.c | 3 +++
1 file changed, 3 insertions(+)
diff ./drivers/md/bitmap.c~current~ ./drivers/md/bitmap.c
--- ./drivers/md/bitmap.c~current~ 2005-08-29 16:32:20.000000000 +1000
+++ ./drivers/md/bitmap.c 2005-08-29 16:46:50.000000000 +1000
@@ -1156,6 +1156,9 @@ static void bitmap_writeback_daemon(mdde
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 */
-
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