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snd_timer_check_slave() still walks all registered timers and all open timer instances to find a matching master for a newly opened slave. Maintain a global list of open master instances that can accept slave links and use it for the slave lookup path instead. This keeps the existing matching semantics while avoiding the nested walk over snd_timer_list and each timer open_list_head. The reverse path in snd_timer_check_master() already scans only the pending slave list, so this makes both lookup paths closer in shape without changing the master/slave linking logic. Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com> Link: https://patch.msgid.link/20260316-alsa-timer-master-list-v1-1-fb95e547110a@gmail.com Signed-off-by: Takashi Iwai <tiwai@suse.de>