md/linear: avoid possible oops and array stop

Since commit ef286f6fa673cd7fb367e1b145069d8dbfcc6081
it has been important that each personality clears
->private in the ->stop() function, or sets it to a
attribute group to be removed.
linear.c doesn't.  This can sometimes lead to an oops,
though it doesn't always.

Suitable for 2.6.33-stable and 2.6.34.

Signed-off-by: NeilBrown <neilb@suse.de>
Cc: stable@kernel.org

diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index bb2a231..9db8ee0 100644 (file)
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -281,6 +281,7 @@ static int linear_stop (mddev_t *mddev)
        rcu_barrier();
        blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
        kfree(conf);
+       mddev->private = NULL;
 
        return 0;
 }