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autofs4 - fix lockdep splat in autofs

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When recursing down the locks when traversing a tree/list in
get_next_positive_dentry() or get_next_positive_subdir() a lock can
change from being nested to being a parent which breaks lockdep. This
patch tells lockdep about what we did.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Steven Rostedt 2011-08-22 11:52:28 +08:00 committed by Al Viro
parent e188dc02d3
commit 1d6f209786
1 changed files with 2 additions and 0 deletions
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2
fs/autofs4/expire.c
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@ -124,6 +124,7 @@ static struct dentry *get_next_positive_subdir(struct dentry *prev,
/* Negative dentry - try next */
if (!simple_positive(q)) {
spin_unlock(&p->d_lock);
lock_set_subclass(&q->d_lock.dep_map, 0, _RET_IP_);
p = q;
goto again;
}
@ -186,6 +187,7 @@ static struct dentry *get_next_positive_dentry(struct dentry *prev,
/* Negative dentry - try next */
if (!simple_positive(ret)) {
spin_unlock(&p->d_lock);
lock_set_subclass(&ret->d_lock.dep_map, 0, _RET_IP_);
p = ret;
goto again;
}