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PM: wakeup: Handle empty list in wakeup_sources_walk_start()

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In the case of an empty wakeup_sources list, wakeup_sources_walk_start()
will return an invalid but non-NULL address. This also affects wrappers
of the aforementioned function, like for_each_wakeup_source().

Update wakeup_sources_walk_start() to return NULL in case of an empty
list.

Fixes: b4941adb24 ("PM: wakeup: Add routine to help fetch wakeup source object.")
Signed-off-by: Samuel Wu <wusamuel@google.com>
[ rjw: Subject and changelog edits ]
Link: https://patch.msgid.link/20260124012133.2451708-2-wusamuel@google.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Samuel Wu 2026-01-23 17:21:29 -08:00 committed by Rafael J. Wysocki
parent 1081c1649d
commit 75ce02f4bc
1 changed files with 1 additions and 3 deletions
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4
drivers/base/power/wakeup.c
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@ -275,9 +275,7 @@ EXPORT_SYMBOL_GPL(wakeup_sources_read_unlock);
*/
struct wakeup_source *wakeup_sources_walk_start(void)
{
struct list_head *ws_head = &wakeup_sources;
return list_entry_rcu(ws_head->next, struct wakeup_source, entry);
return list_first_or_null_rcu(&wakeup_sources, struct wakeup_source, entry);
}
EXPORT_SYMBOL_GPL(wakeup_sources_walk_start);