From: Takashi Iwai Date: Thu, 28 Aug 2025 13:27:08 +0000 (+0200) Subject: ALSA: firewire: fireworks: Use guard() for mutex locks X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=760c91a25af4f240d199cf719f008e7a98ab246b;p=users%2Fhch%2Fmisc.git ALSA: firewire: fireworks: Use guard() for mutex locks Replace the manual mutex lock/unlock pairs with guard() for code simplification. Only code refactoring, and no behavior change. Reviewed-by: Takashi Sakamoto Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20250828132802.9032-5-tiwai@suse.de --- diff --git a/sound/firewire/fireworks/fireworks.c b/sound/firewire/fireworks/fireworks.c index 69f722244362..3378c7dce88a 100644 --- a/sound/firewire/fireworks/fireworks.c +++ b/sound/firewire/fireworks/fireworks.c @@ -188,9 +188,9 @@ efw_card_free(struct snd_card *card) { struct snd_efw *efw = card->private_data; - mutex_lock(&devices_mutex); - clear_bit(efw->card_index, devices_used); - mutex_unlock(&devices_mutex); + scoped_guard(mutex, &devices_mutex) { + clear_bit(efw->card_index, devices_used); + } snd_efw_stream_destroy_duplex(efw); snd_efw_transaction_remove_instance(efw); @@ -207,25 +207,21 @@ static int efw_probe(struct fw_unit *unit, const struct ieee1394_device_id *entr int err; // check registered cards. - mutex_lock(&devices_mutex); - for (card_index = 0; card_index < SNDRV_CARDS; ++card_index) { - if (!test_bit(card_index, devices_used) && enable[card_index]) - break; - } - if (card_index >= SNDRV_CARDS) { - mutex_unlock(&devices_mutex); - return -ENOENT; - } - - err = snd_card_new(&unit->device, index[card_index], id[card_index], THIS_MODULE, - sizeof(*efw), &card); - if (err < 0) { - mutex_unlock(&devices_mutex); - return err; + scoped_guard(mutex, &devices_mutex) { + for (card_index = 0; card_index < SNDRV_CARDS; ++card_index) { + if (!test_bit(card_index, devices_used) && enable[card_index]) + break; + } + if (card_index >= SNDRV_CARDS) + return -ENOENT; + + err = snd_card_new(&unit->device, index[card_index], id[card_index], THIS_MODULE, + sizeof(*efw), &card); + if (err < 0) + return err; + card->private_free = efw_card_free; + set_bit(card_index, devices_used); } - card->private_free = efw_card_free; - set_bit(card_index, devices_used); - mutex_unlock(&devices_mutex); efw = card->private_data; efw->unit = fw_unit_get(unit); @@ -287,9 +283,8 @@ static void efw_update(struct fw_unit *unit) snd_efw_transaction_bus_reset(efw->unit); - mutex_lock(&efw->mutex); + guard(mutex)(&efw->mutex); snd_efw_stream_update_duplex(efw); - mutex_unlock(&efw->mutex); } static void efw_remove(struct fw_unit *unit) diff --git a/sound/firewire/fireworks/fireworks_midi.c b/sound/firewire/fireworks/fireworks_midi.c index 350bf4d299c2..90fe809a26c0 100644 --- a/sound/firewire/fireworks/fireworks_midi.c +++ b/sound/firewire/fireworks/fireworks_midi.c @@ -14,20 +14,19 @@ static int midi_open(struct snd_rawmidi_substream *substream) err = snd_efw_stream_lock_try(efw); if (err < 0) - goto end; - - mutex_lock(&efw->mutex); - err = snd_efw_stream_reserve_duplex(efw, 0, 0, 0); - if (err >= 0) { - ++efw->substreams_counter; - err = snd_efw_stream_start_duplex(efw); - if (err < 0) - --efw->substreams_counter; + return err; + + scoped_guard(mutex, &efw->mutex) { + err = snd_efw_stream_reserve_duplex(efw, 0, 0, 0); + if (err >= 0) { + ++efw->substreams_counter; + err = snd_efw_stream_start_duplex(efw); + if (err < 0) + --efw->substreams_counter; + } } - mutex_unlock(&efw->mutex); if (err < 0) snd_efw_stream_lock_release(efw); -end: return err; } @@ -35,10 +34,10 @@ static int midi_close(struct snd_rawmidi_substream *substream) { struct snd_efw *efw = substream->rmidi->private_data; - mutex_lock(&efw->mutex); - --efw->substreams_counter; - snd_efw_stream_stop_duplex(efw); - mutex_unlock(&efw->mutex); + scoped_guard(mutex, &efw->mutex) { + --efw->substreams_counter; + snd_efw_stream_stop_duplex(efw); + } snd_efw_stream_lock_release(efw); return 0; diff --git a/sound/firewire/fireworks/fireworks_pcm.c b/sound/firewire/fireworks/fireworks_pcm.c index eaf7778211de..9399293a9fe9 100644 --- a/sound/firewire/fireworks/fireworks_pcm.c +++ b/sound/firewire/fireworks/fireworks_pcm.c @@ -189,46 +189,38 @@ static int pcm_open(struct snd_pcm_substream *substream) if (err < 0) goto err_locked; - mutex_lock(&efw->mutex); - - // When source of clock is not internal or any stream is reserved for - // transmission of PCM frames, the available sampling rate is limited - // at current one. - if ((clock_source != SND_EFW_CLOCK_SOURCE_INTERNAL) || - (efw->substreams_counter > 0 && d->events_per_period > 0)) { - unsigned int frames_per_period = d->events_per_period; - unsigned int frames_per_buffer = d->events_per_buffer; - unsigned int sampling_rate; - - err = snd_efw_command_get_sampling_rate(efw, &sampling_rate); - if (err < 0) { - mutex_unlock(&efw->mutex); - goto err_locked; - } - substream->runtime->hw.rate_min = sampling_rate; - substream->runtime->hw.rate_max = sampling_rate; - - if (frames_per_period > 0) { - err = snd_pcm_hw_constraint_minmax(substream->runtime, - SNDRV_PCM_HW_PARAM_PERIOD_SIZE, - frames_per_period, frames_per_period); - if (err < 0) { - mutex_unlock(&efw->mutex); - goto err_locked; - } - - err = snd_pcm_hw_constraint_minmax(substream->runtime, - SNDRV_PCM_HW_PARAM_BUFFER_SIZE, - frames_per_buffer, frames_per_buffer); - if (err < 0) { - mutex_unlock(&efw->mutex); + scoped_guard(mutex, &efw->mutex) { + // When source of clock is not internal or any stream is reserved for + // transmission of PCM frames, the available sampling rate is limited + // at current one. + if ((clock_source != SND_EFW_CLOCK_SOURCE_INTERNAL) || + (efw->substreams_counter > 0 && d->events_per_period > 0)) { + unsigned int frames_per_period = d->events_per_period; + unsigned int frames_per_buffer = d->events_per_buffer; + unsigned int sampling_rate; + + err = snd_efw_command_get_sampling_rate(efw, &sampling_rate); + if (err < 0) goto err_locked; + substream->runtime->hw.rate_min = sampling_rate; + substream->runtime->hw.rate_max = sampling_rate; + + if (frames_per_period > 0) { + err = snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE, + frames_per_period, frames_per_period); + if (err < 0) + goto err_locked; + + err = snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_BUFFER_SIZE, + frames_per_buffer, frames_per_buffer); + if (err < 0) + goto err_locked; } } } - mutex_unlock(&efw->mutex); - snd_pcm_set_sync(substream); return 0; @@ -255,12 +247,11 @@ static int pcm_hw_params(struct snd_pcm_substream *substream, unsigned int frames_per_period = params_period_size(hw_params); unsigned int frames_per_buffer = params_buffer_size(hw_params); - mutex_lock(&efw->mutex); + guard(mutex)(&efw->mutex); err = snd_efw_stream_reserve_duplex(efw, rate, frames_per_period, frames_per_buffer); if (err >= 0) ++efw->substreams_counter; - mutex_unlock(&efw->mutex); } return err; @@ -270,15 +261,13 @@ static int pcm_hw_free(struct snd_pcm_substream *substream) { struct snd_efw *efw = substream->private_data; - mutex_lock(&efw->mutex); + guard(mutex)(&efw->mutex); if (substream->runtime->state != SNDRV_PCM_STATE_OPEN) --efw->substreams_counter; snd_efw_stream_stop_duplex(efw); - mutex_unlock(&efw->mutex); - return 0; }