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dm mpath: avoid attempting to activate null path

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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@us.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Chandra Seetharaman 2008-11-13 23:39:00 +00:00 committed by Alasdair G Kergon
parent 6edebdee48
commit b81aa1c792
1 changed files with 2 additions and 2 deletions
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4
drivers/md/dm-mpath.c
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@ -441,13 +441,13 @@ static void process_queued_ios(struct work_struct *work)
__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;