The module argument passed to snd_card_new() must be a valid non-NULL
pointer when the module support is enabled. Since ASoC driver passes
the argument from each snd_soc_card definition, one may forget to set
the owner field and lead to a NULL module easily.
For catching such an overlook, add a WARN_ON() in snd_card_new().
Also, put the card->module assignment in the ifdef block for a very
minor optimization.
Link: https://lore.kernel.org/r/20200624160300.21703-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
mutex_unlock(&snd_card_mutex);
card->dev = parent;
card->number = idx;
+#ifdef MODULE
+ WARN_ON(!module);
card->module = module;
+#endif
INIT_LIST_HEAD(&card->devices);
init_rwsem(&card->controls_rwsem);
rwlock_init(&card->ctl_files_rwlock);