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ALSA: core: Make snd_card_disconnect() return void
All callers from other files ignore the return value of this function. And it can only ever return a non-zero value if the parameter card is NULL. Move the check for card being NULL into snd_card_free_when_closed() to keep the previous behaviour. Note this isn't necessary for snd_card_disconnect_sync() because if card was NULL in there the dereference of card for dev_err() would oops the kernel. Replace this by an oops triggered by the dereference of card for spin_lock_irq(). Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Jaroslav Kysela <perex@perex.cz> Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Acked-by: Geoff Levand <geoff@infradead.org> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/20230207191907.467756-2-u.kleine-koenig@pengutronix.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -286,7 +286,7 @@ int snd_devm_card_new(struct device *parent, int idx, const char *xid,
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struct module *module, size_t extra_size,
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struct snd_card **card_ret);
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int snd_card_disconnect(struct snd_card *card);
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void snd_card_disconnect(struct snd_card *card);
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void snd_card_disconnect_sync(struct snd_card *card);
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int snd_card_free(struct snd_card *card);
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int snd_card_free_when_closed(struct snd_card *card);
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@ -489,17 +489,17 @@ static const struct file_operations snd_shutdown_f_ops =
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* Note: The current implementation replaces all active file->f_op with special
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* dummy file operations (they do nothing except release).
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*/
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int snd_card_disconnect(struct snd_card *card)
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void snd_card_disconnect(struct snd_card *card)
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{
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struct snd_monitor_file *mfile;
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if (!card)
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return -EINVAL;
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return;
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spin_lock(&card->files_lock);
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if (card->shutdown) {
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spin_unlock(&card->files_lock);
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return 0;
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return;
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}
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card->shutdown = 1;
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@ -548,7 +548,6 @@ int snd_card_disconnect(struct snd_card *card)
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wake_up(&card->power_sleep);
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snd_power_sync_ref(card);
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#endif
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return 0;
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}
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EXPORT_SYMBOL(snd_card_disconnect);
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@ -563,15 +562,7 @@ EXPORT_SYMBOL(snd_card_disconnect);
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*/
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void snd_card_disconnect_sync(struct snd_card *card)
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{
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int err;
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err = snd_card_disconnect(card);
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if (err < 0) {
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dev_err(card->dev,
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"snd_card_disconnect error (%d), skipping sync\n",
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err);
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return;
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}
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snd_card_disconnect(card);
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spin_lock_irq(&card->files_lock);
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wait_event_lock_irq(card->remove_sleep,
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@ -619,9 +610,10 @@ static int snd_card_do_free(struct snd_card *card)
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*/
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int snd_card_free_when_closed(struct snd_card *card)
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{
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int ret = snd_card_disconnect(card);
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if (ret)
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return ret;
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if (!card)
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return -EINVAL;
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snd_card_disconnect(card);
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put_device(&card->card_dev);
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return 0;
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}
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