Path activation code is called even when the pgpath is NULL. This could
lead to a panic in activate_path(). Such a panic is seen in -rt kernel.
This problem has been there before the pg_init() was moved to a
workqueue.
Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
---
Index: linux-2.6.28-rc3/drivers/md/dm-mpath.c
===================================================================
--- linux-2.6.28-rc3.orig/drivers/md/dm-mpath.c
+++ linux-2.6.28-rc3/drivers/md/dm-mpath.c
@@ -441,13 +441,13 @@ static void process_queued_ios(struct wo
__choose_pgpath(m);
pgpath = m->current_pgpath;
- m->pgpath_to_activate = m->current_pgpath;
if ((pgpath && !m->queue_io) ||
(!pgpath && !m->queue_if_no_path))
must_queue = 0;
- if (m->pg_init_required && !m->pg_init_in_progress) {
+ if (m->pg_init_required && !m->pg_init_in_progress && pgpath) {
+ m->pgpath_to_activate = pgpath;
m->pg_init_count++;
m->pg_init_required = 0;
m->pg_init_in_progress = 1;
--
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