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Commit 40cf2123 authored by NeilBrown's avatar NeilBrown Committed by Shaohua Li
Browse files

md/multipath: add rcu protection to rdev access in multipath_status. 



Signed-off-by: default avatarNeilBrown <neilb@suse.com>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent 5fd13351

drivers/md/multipath.c

+7 −5
Original line number Original line Diff line number Diff line
@@ -148,10 +148,12 @@ static void multipath_status (struct seq_file *seq, struct mddev *mddev) 




	seq_printf (seq, " [%d/%d] [", conf->raid_disks,

	seq_printf (seq, " [%d/%d] [", conf->raid_disks,

		    conf->raid_disks - mddev->degraded);

		    conf->raid_disks - mddev->degraded);

	for (i = 0; i < conf->raid_disks; i++)

	rcu_read_lock();

		seq_printf (seq, "%s",

	for (i = 0; i < conf->raid_disks; i++) {

			       conf->multipaths[i].rdev &&

		struct md_rdev *rdev = rcu_dereference(conf->multipaths[i].rdev);

			       test_bit(In_sync, &conf->multipaths[i].rdev->flags) ? "U" : "_");

		seq_printf (seq, "%s", rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_");

	}

	rcu_read_unlock();

	seq_printf (seq, "]");

	seq_printf (seq, "]");

}

}