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[v2,09/13] dm-mpath: Verify locking assumptions at runtime

Message ID 20170427171126.26814-10-bart.vanassche@sandisk.com (mailing list archive)
State Accepted, archived
Delegated to: Mike Snitzer
Headers show

Commit Message

Bart Van Assche April 27, 2017, 5:11 p.m. UTC 
Verify at runtime that __pg_init_all_paths() is called with
multipath.lock held if lockdep is enabled.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
---
 drivers/md/dm-mpath.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index fc3e7f028110..4e4d53faf2d4 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -298,6 +298,8 @@  static int __pg_init_all_paths(struct multipath *m)
 	struct pgpath *pgpath;
 	unsigned long pg_init_delay = 0;
 
+	lockdep_assert_held(&m->lock);
+
 	if (atomic_read(&m->pg_init_in_progress) || test_bit(MPATHF_PG_INIT_DISABLED, &m->flags))
 		return 0;