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[PATCH] klist: Fix broken kref counting in find functions

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The klist reference counting in the find functions that use
klist_iter_init_node is broken.  If the function (for example
driver_find_device) is called with a NULL start object then everything is
fine, the first call to next_device()/klist_next increases the ref-count of
the first node on the list and does nothing for the start object which is
NULL.

If they are called with a valid start object then klist_next will decrement
the ref-count for the start object but nobody has incremented it.  Logical
place to fix this would be klist_iter_init_node because the function puts a
reference of the object into the klist_iter struct.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Frank Pavlic <pavlic@de.ibm.com>
Cc: Patrick Mochel <mochel@digitalimplant.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Frank Pavlic 2005-11-26 20:48:40 -08:00 committed by Greg Kroah-Hartman
parent bf74ad5bc4
commit e22dafbcd7
1 changed files with 2 additions and 0 deletions
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2
lib/klist.c
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@ -199,6 +199,8 @@ void klist_iter_init_node(struct klist * k, struct klist_iter * i, struct klist_
i->i_klist = k;
i->i_head = &k->k_list;
i->i_cur = n;
if (n)
kref_get(&n->n_ref);
}
EXPORT_SYMBOL_GPL(klist_iter_init_node);