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ALSA: rawmidi: Use guard() for locking
We can simplify the code gracefully with new guard() macro and co for automatic cleanup of locks. There are a few remaining explicit mutex and spinlock calls, and those are the places where the temporary unlock/relocking happens -- which guard() doens't cover well yet. Only the code refactoring, and no functional changes. Signed-off-by: Takashi Iwai <tiwai@suse.de> Link: https://lore.kernel.org/r/20240227085306.9764-10-tiwai@suse.de
This commit is contained in:
Takashi Iwai
parent
471be437be
commit
84bb065b31
@ -105,13 +105,8 @@ static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
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static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
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{
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unsigned long flags;
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bool ready;
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spin_lock_irqsave(&substream->lock, flags);
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ready = __snd_rawmidi_ready(substream->runtime);
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spin_unlock_irqrestore(&substream->lock, flags);
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return ready;
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guard(spinlock_irqsave)(&substream->lock);
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return __snd_rawmidi_ready(substream->runtime);
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}
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static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
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@ -238,12 +233,9 @@ static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
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static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,
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bool is_input)
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{
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unsigned long flags;
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spin_lock_irqsave(&substream->lock, flags);
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guard(spinlock_irqsave)(&substream->lock);
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if (substream->opened && substream->runtime)
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__reset_runtime_ptrs(substream->runtime, is_input);
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spin_unlock_irqrestore(&substream->lock, flags);
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}
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int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
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@ -260,33 +252,29 @@ int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
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long timeout;
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struct snd_rawmidi_runtime *runtime;
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spin_lock_irq(&substream->lock);
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runtime = substream->runtime;
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if (!substream->opened || !runtime || !runtime->buffer) {
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err = -EINVAL;
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} else {
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scoped_guard(spinlock_irq, &substream->lock) {
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runtime = substream->runtime;
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if (!substream->opened || !runtime || !runtime->buffer)
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return -EINVAL;
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snd_rawmidi_buffer_ref(runtime);
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runtime->drain = 1;
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}
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spin_unlock_irq(&substream->lock);
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if (err < 0)
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return err;
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timeout = wait_event_interruptible_timeout(runtime->sleep,
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(runtime->avail >= runtime->buffer_size),
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10*HZ);
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spin_lock_irq(&substream->lock);
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if (signal_pending(current))
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err = -ERESTARTSYS;
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if (runtime->avail < runtime->buffer_size && !timeout) {
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rmidi_warn(substream->rmidi,
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"rawmidi drain error (avail = %li, buffer_size = %li)\n",
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(long)runtime->avail, (long)runtime->buffer_size);
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err = -EIO;
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scoped_guard(spinlock_irq, &substream->lock) {
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if (signal_pending(current))
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err = -ERESTARTSYS;
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if (runtime->avail < runtime->buffer_size && !timeout) {
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rmidi_warn(substream->rmidi,
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"rawmidi drain error (avail = %li, buffer_size = %li)\n",
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(long)runtime->avail, (long)runtime->buffer_size);
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err = -EIO;
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}
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runtime->drain = 0;
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}
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runtime->drain = 0;
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spin_unlock_irq(&substream->lock);
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if (err != -ERESTARTSYS) {
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/* we need wait a while to make sure that Tx FIFOs are empty */
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@ -297,9 +285,8 @@ int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
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snd_rawmidi_drop_output(substream);
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}
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spin_lock_irq(&substream->lock);
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snd_rawmidi_buffer_unref(runtime);
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spin_unlock_irq(&substream->lock);
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scoped_guard(spinlock_irq, &substream->lock)
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snd_rawmidi_buffer_unref(runtime);
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return err;
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}
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@ -363,14 +350,13 @@ static int open_substream(struct snd_rawmidi *rmidi,
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snd_rawmidi_runtime_free(substream);
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return err;
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}
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spin_lock_irq(&substream->lock);
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guard(spinlock_irq)(&substream->lock);
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substream->opened = 1;
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substream->active_sensing = 0;
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if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
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substream->append = 1;
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substream->pid = get_pid(task_pid(current));
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rmidi->streams[substream->stream].substream_opened++;
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spin_unlock_irq(&substream->lock);
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}
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substream->use_count++;
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return 0;
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@ -433,9 +419,8 @@ int snd_rawmidi_kernel_open(struct snd_rawmidi *rmidi, int subdevice,
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if (!try_module_get(rmidi->card->module))
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return -ENXIO;
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mutex_lock(&rmidi->open_mutex);
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guard(mutex)(&rmidi->open_mutex);
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err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
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mutex_unlock(&rmidi->open_mutex);
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if (err < 0)
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module_put(rmidi->card->module);
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return err;
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@ -568,10 +553,10 @@ static void close_substream(struct snd_rawmidi *rmidi,
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}
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snd_rawmidi_buffer_ref_sync(substream);
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}
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spin_lock_irq(&substream->lock);
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substream->opened = 0;
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substream->append = 0;
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spin_unlock_irq(&substream->lock);
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scoped_guard(spinlock_irq, &substream->lock) {
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substream->opened = 0;
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substream->append = 0;
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}
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substream->ops->close(substream);
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if (substream->runtime->private_free)
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substream->runtime->private_free(substream);
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@ -586,7 +571,7 @@ static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
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struct snd_rawmidi *rmidi;
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rmidi = rfile->rmidi;
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mutex_lock(&rmidi->open_mutex);
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guard(mutex)(&rmidi->open_mutex);
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if (rfile->input) {
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close_substream(rmidi, rfile->input, 1);
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rfile->input = NULL;
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@ -596,7 +581,6 @@ static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
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rfile->output = NULL;
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}
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rfile->rmidi = NULL;
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mutex_unlock(&rmidi->open_mutex);
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wake_up(&rmidi->open_wait);
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}
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@ -695,12 +679,8 @@ static int __snd_rawmidi_info_select(struct snd_card *card,
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int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
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{
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int ret;
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mutex_lock(®ister_mutex);
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ret = __snd_rawmidi_info_select(card, info);
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mutex_unlock(®ister_mutex);
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return ret;
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guard(mutex)(®ister_mutex);
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return __snd_rawmidi_info_select(card, info);
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}
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EXPORT_SYMBOL(snd_rawmidi_info_select);
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@ -744,9 +724,8 @@ static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
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newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
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if (!newbuf)
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return -ENOMEM;
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spin_lock_irq(&substream->lock);
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guard(spinlock_irq)(&substream->lock);
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if (runtime->buffer_ref) {
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spin_unlock_irq(&substream->lock);
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kvfree(newbuf);
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return -EBUSY;
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}
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@ -754,7 +733,6 @@ static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
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runtime->buffer = newbuf;
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runtime->buffer_size = params->buffer_size;
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__reset_runtime_ptrs(runtime, is_input);
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spin_unlock_irq(&substream->lock);
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kvfree(oldbuf);
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}
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runtime->avail_min = params->avail_min;
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@ -767,15 +745,12 @@ int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
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int err;
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snd_rawmidi_drain_output(substream);
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mutex_lock(&substream->rmidi->open_mutex);
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guard(mutex)(&substream->rmidi->open_mutex);
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if (substream->append && substream->use_count > 1)
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err = -EBUSY;
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else
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err = resize_runtime_buffer(substream, params, false);
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return -EBUSY;
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err = resize_runtime_buffer(substream, params, false);
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if (!err)
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substream->active_sensing = !params->no_active_sensing;
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mutex_unlock(&substream->rmidi->open_mutex);
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return err;
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}
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EXPORT_SYMBOL(snd_rawmidi_output_params);
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@ -788,7 +763,7 @@ int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
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int err;
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snd_rawmidi_drain_input(substream);
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mutex_lock(&substream->rmidi->open_mutex);
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guard(mutex)(&substream->rmidi->open_mutex);
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if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
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err = -EINVAL;
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else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
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@ -802,7 +777,6 @@ int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
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substream->framing = framing;
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substream->clock_type = clock_type;
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}
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mutex_unlock(&substream->rmidi->open_mutex);
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return 0;
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}
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EXPORT_SYMBOL(snd_rawmidi_input_params);
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@ -814,9 +788,8 @@ static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
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memset(status, 0, sizeof(*status));
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status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
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spin_lock_irq(&substream->lock);
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guard(spinlock_irq)(&substream->lock);
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status->avail = runtime->avail;
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spin_unlock_irq(&substream->lock);
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return 0;
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}
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@ -827,11 +800,10 @@ static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
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memset(status, 0, sizeof(*status));
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status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
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spin_lock_irq(&substream->lock);
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guard(spinlock_irq)(&substream->lock);
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status->avail = runtime->avail;
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status->xruns = runtime->xruns;
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runtime->xruns = 0;
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spin_unlock_irq(&substream->lock);
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return 0;
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}
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@ -1025,19 +997,19 @@ static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
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return -EFAULT;
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if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
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device = SNDRV_RAWMIDI_DEVICES - 1;
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mutex_lock(®ister_mutex);
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device = device < 0 ? 0 : device + 1;
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for (; device < SNDRV_RAWMIDI_DEVICES; device++) {
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rmidi = snd_rawmidi_search(card, device);
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if (!rmidi)
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continue;
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is_ump = rawmidi_is_ump(rmidi);
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if (find_ump == is_ump)
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break;
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scoped_guard(mutex, ®ister_mutex) {
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device = device < 0 ? 0 : device + 1;
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for (; device < SNDRV_RAWMIDI_DEVICES; device++) {
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rmidi = snd_rawmidi_search(card, device);
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if (!rmidi)
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continue;
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is_ump = rawmidi_is_ump(rmidi);
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if (find_ump == is_ump)
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break;
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}
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if (device == SNDRV_RAWMIDI_DEVICES)
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device = -1;
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}
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if (device == SNDRV_RAWMIDI_DEVICES)
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device = -1;
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mutex_unlock(®ister_mutex);
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if (put_user(device, argp))
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return -EFAULT;
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return 0;
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@ -1050,18 +1022,16 @@ static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd,
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{
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struct snd_ump_endpoint_info __user *info = argp;
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struct snd_rawmidi *rmidi;
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int device, ret;
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int device;
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if (get_user(device, &info->device))
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return -EFAULT;
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mutex_lock(®ister_mutex);
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guard(mutex)(®ister_mutex);
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rmidi = snd_rawmidi_search(card, device);
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if (rmidi && rmidi->ops && rmidi->ops->ioctl)
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ret = rmidi->ops->ioctl(rmidi, cmd, argp);
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return rmidi->ops->ioctl(rmidi, cmd, argp);
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else
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ret = -ENXIO;
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mutex_unlock(®ister_mutex);
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return ret;
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return -ENXIO;
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}
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#endif
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@ -1168,27 +1138,23 @@ static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substr
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int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
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const unsigned char *buffer, int count)
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{
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unsigned long flags;
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struct timespec64 ts64 = get_framing_tstamp(substream);
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int result = 0, count1;
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struct snd_rawmidi_runtime *runtime;
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spin_lock_irqsave(&substream->lock, flags);
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if (!substream->opened) {
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result = -EBADFD;
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goto unlock;
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}
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guard(spinlock_irqsave)(&substream->lock);
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if (!substream->opened)
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return -EBADFD;
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runtime = substream->runtime;
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if (!runtime || !runtime->buffer) {
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rmidi_dbg(substream->rmidi,
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"snd_rawmidi_receive: input is not active!!!\n");
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result = -EINVAL;
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goto unlock;
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return -EINVAL;
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}
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count = get_aligned_size(runtime, count);
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if (!count)
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goto unlock;
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return result;
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if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
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result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
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@ -1211,7 +1177,7 @@ int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
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count1 = runtime->buffer_size - runtime->avail;
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count1 = get_aligned_size(runtime, count1);
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if (!count1)
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goto unlock;
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return result;
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memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
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runtime->hw_ptr += count1;
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runtime->hw_ptr %= runtime->buffer_size;
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@ -1239,8 +1205,6 @@ int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
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else if (__snd_rawmidi_ready(runtime))
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wake_up(&runtime->sleep);
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}
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unlock:
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spin_unlock_irqrestore(&substream->lock, flags);
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return result;
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}
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EXPORT_SYMBOL(snd_rawmidi_receive);
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@ -1362,20 +1326,15 @@ static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t coun
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int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
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{
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struct snd_rawmidi_runtime *runtime;
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int result;
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unsigned long flags;
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spin_lock_irqsave(&substream->lock, flags);
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guard(spinlock_irqsave)(&substream->lock);
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runtime = substream->runtime;
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if (!substream->opened || !runtime || !runtime->buffer) {
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rmidi_dbg(substream->rmidi,
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"snd_rawmidi_transmit_empty: output is not active!!!\n");
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result = 1;
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} else {
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result = runtime->avail >= runtime->buffer_size;
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return 1;
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}
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spin_unlock_irqrestore(&substream->lock, flags);
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return result;
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return (runtime->avail >= runtime->buffer_size);
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}
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EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
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@ -1449,16 +1408,10 @@ static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
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int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
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unsigned char *buffer, int count)
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{
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int result;
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unsigned long flags;
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spin_lock_irqsave(&substream->lock, flags);
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guard(spinlock_irqsave)(&substream->lock);
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if (!substream->opened || !substream->runtime)
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result = -EBADFD;
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else
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result = __snd_rawmidi_transmit_peek(substream, buffer, count);
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spin_unlock_irqrestore(&substream->lock, flags);
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return result;
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return -EBADFD;
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return __snd_rawmidi_transmit_peek(substream, buffer, count);
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}
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EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
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@ -1505,16 +1458,10 @@ static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
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*/
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int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
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{
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int result;
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unsigned long flags;
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spin_lock_irqsave(&substream->lock, flags);
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guard(spinlock_irqsave)(&substream->lock);
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if (!substream->opened || !substream->runtime)
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result = -EBADFD;
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else
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result = __snd_rawmidi_transmit_ack(substream, count);
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spin_unlock_irqrestore(&substream->lock, flags);
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return result;
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return -EBADFD;
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return __snd_rawmidi_transmit_ack(substream, count);
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}
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EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
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@ -1531,21 +1478,13 @@ EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
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int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
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unsigned char *buffer, int count)
|
||||
{
|
||||
int result;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&substream->lock, flags);
|
||||
guard(spinlock_irqsave)(&substream->lock);
|
||||
if (!substream->opened)
|
||||
result = -EBADFD;
|
||||
else {
|
||||
count = __snd_rawmidi_transmit_peek(substream, buffer, count);
|
||||
if (count <= 0)
|
||||
result = count;
|
||||
else
|
||||
result = __snd_rawmidi_transmit_ack(substream, count);
|
||||
}
|
||||
spin_unlock_irqrestore(&substream->lock, flags);
|
||||
return result;
|
||||
return -EBADFD;
|
||||
count = __snd_rawmidi_transmit_peek(substream, buffer, count);
|
||||
if (count <= 0)
|
||||
return count;
|
||||
return __snd_rawmidi_transmit_ack(substream, count);
|
||||
}
|
||||
EXPORT_SYMBOL(snd_rawmidi_transmit);
|
||||
|
||||
@ -1558,17 +1497,15 @@ EXPORT_SYMBOL(snd_rawmidi_transmit);
|
||||
int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
|
||||
{
|
||||
struct snd_rawmidi_runtime *runtime;
|
||||
unsigned long flags;
|
||||
int count = 0;
|
||||
|
||||
spin_lock_irqsave(&substream->lock, flags);
|
||||
guard(spinlock_irqsave)(&substream->lock);
|
||||
runtime = substream->runtime;
|
||||
if (substream->opened && runtime &&
|
||||
runtime->avail < runtime->buffer_size) {
|
||||
count = runtime->buffer_size - runtime->avail;
|
||||
__snd_rawmidi_transmit_ack(substream, count);
|
||||
}
|
||||
spin_unlock_irqrestore(&substream->lock, flags);
|
||||
return count;
|
||||
}
|
||||
EXPORT_SYMBOL(snd_rawmidi_proceed);
|
||||
@ -1772,7 +1709,7 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
|
||||
rawmidi_is_ump(rmidi) ? "UMP" : "Legacy");
|
||||
if (rmidi->ops && rmidi->ops->proc_read)
|
||||
rmidi->ops->proc_read(entry, buffer);
|
||||
mutex_lock(&rmidi->open_mutex);
|
||||
guard(mutex)(&rmidi->open_mutex);
|
||||
if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
|
||||
list_for_each_entry(substream,
|
||||
&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
|
||||
@ -1787,10 +1724,10 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
|
||||
" Owner PID : %d\n",
|
||||
pid_vnr(substream->pid));
|
||||
runtime = substream->runtime;
|
||||
spin_lock_irq(&substream->lock);
|
||||
buffer_size = runtime->buffer_size;
|
||||
avail = runtime->avail;
|
||||
spin_unlock_irq(&substream->lock);
|
||||
scoped_guard(spinlock_irq, &substream->lock) {
|
||||
buffer_size = runtime->buffer_size;
|
||||
avail = runtime->avail;
|
||||
}
|
||||
snd_iprintf(buffer,
|
||||
" Mode : %s\n"
|
||||
" Buffer size : %lu\n"
|
||||
@ -1814,11 +1751,11 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
|
||||
" Owner PID : %d\n",
|
||||
pid_vnr(substream->pid));
|
||||
runtime = substream->runtime;
|
||||
spin_lock_irq(&substream->lock);
|
||||
buffer_size = runtime->buffer_size;
|
||||
avail = runtime->avail;
|
||||
xruns = runtime->xruns;
|
||||
spin_unlock_irq(&substream->lock);
|
||||
scoped_guard(spinlock_irq, &substream->lock) {
|
||||
buffer_size = runtime->buffer_size;
|
||||
avail = runtime->avail;
|
||||
xruns = runtime->xruns;
|
||||
}
|
||||
snd_iprintf(buffer,
|
||||
" Buffer size : %lu\n"
|
||||
" Avail : %lu\n"
|
||||
@ -1835,7 +1772,6 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
|
||||
}
|
||||
}
|
||||
}
|
||||
mutex_unlock(&rmidi->open_mutex);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -2024,12 +1960,12 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
|
||||
if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
|
||||
return -ENOMEM;
|
||||
err = 0;
|
||||
mutex_lock(®ister_mutex);
|
||||
if (snd_rawmidi_search(rmidi->card, rmidi->device))
|
||||
err = -EBUSY;
|
||||
else
|
||||
list_add_tail(&rmidi->list, &snd_rawmidi_devices);
|
||||
mutex_unlock(®ister_mutex);
|
||||
scoped_guard(mutex, ®ister_mutex) {
|
||||
if (snd_rawmidi_search(rmidi->card, rmidi->device))
|
||||
err = -EBUSY;
|
||||
else
|
||||
list_add_tail(&rmidi->list, &snd_rawmidi_devices);
|
||||
}
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
@ -2102,9 +2038,8 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
|
||||
error_unregister:
|
||||
snd_unregister_device(rmidi->dev);
|
||||
error:
|
||||
mutex_lock(®ister_mutex);
|
||||
list_del(&rmidi->list);
|
||||
mutex_unlock(®ister_mutex);
|
||||
scoped_guard(mutex, ®ister_mutex)
|
||||
list_del(&rmidi->list);
|
||||
return err;
|
||||
}
|
||||
|
||||
@ -2113,8 +2048,8 @@ static int snd_rawmidi_dev_disconnect(struct snd_device *device)
|
||||
struct snd_rawmidi *rmidi = device->device_data;
|
||||
int dir;
|
||||
|
||||
mutex_lock(®ister_mutex);
|
||||
mutex_lock(&rmidi->open_mutex);
|
||||
guard(mutex)(®ister_mutex);
|
||||
guard(mutex)(&rmidi->open_mutex);
|
||||
wake_up(&rmidi->open_wait);
|
||||
list_del_init(&rmidi->list);
|
||||
for (dir = 0; dir < 2; dir++) {
|
||||
@ -2140,8 +2075,6 @@ static int snd_rawmidi_dev_disconnect(struct snd_device *device)
|
||||
}
|
||||
#endif /* CONFIG_SND_OSSEMUL */
|
||||
snd_unregister_device(rmidi->dev);
|
||||
mutex_unlock(&rmidi->open_mutex);
|
||||
mutex_unlock(®ister_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user