From: Samuel Wu Date: Sat, 24 Jan 2026 01:21:29 +0000 (-0800) Subject: PM: wakeup: Handle empty list in wakeup_sources_walk_start() X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75ce02f4bc9a8b8350b6b1b01872467b0cc960cc;p=thirdparty%2Flinux.git PM: wakeup: Handle empty list in wakeup_sources_walk_start() 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: b4941adb24c0 ("PM: wakeup: Add routine to help fetch wakeup source object.") Signed-off-by: Samuel Wu [ rjw: Subject and changelog edits ] Link: https://patch.msgid.link/20260124012133.2451708-2-wusamuel@google.com Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index 1e1a0e7eeac5f..e69033d16fba0 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -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);