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ALSA: rawmidi: Simplify error paths 

Apply the standard idiom: rewrite the multiple unlocks in error paths
in the goto-error-and-single-unlock way.

Just a code refactoring, and no functional changes.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2018-07-17 22:45:50 +02:00
parent 5bed913972
commit 7fdc9b0807
1 changed files with 39 additions and 37 deletions
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76
sound/core/rawmidi.c
View File

@ -338,22 +338,20 @@ int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
int mode, struct snd_rawmidi_file *rfile)
{
struct snd_rawmidi *rmidi;
int err;
int err = 0;
if (snd_BUG_ON(!rfile))
return -EINVAL;
mutex_lock(&register_mutex);
rmidi = snd_rawmidi_search(card, device);
if (rmidi == NULL) {
mutex_unlock(&register_mutex);
return -ENODEV;
}
if (!try_module_get(rmidi->card->module)) {
mutex_unlock(&register_mutex);
return -ENXIO;
}
if (!rmidi)
err = -ENODEV;
else if (!try_module_get(rmidi->card->module))
err = -ENXIO;
mutex_unlock(&register_mutex);
if (err < 0)
return err;
mutex_lock(&rmidi->open_mutex);
err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
@ -1581,26 +1579,25 @@ int snd_rawmidi_new(struct snd_card *card, char *id, int device,
&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
SNDRV_RAWMIDI_STREAM_INPUT,
input_count);
if (err < 0) {
snd_rawmidi_free(rmidi);
return err;
}
if (err < 0)
goto error;
err = snd_rawmidi_alloc_substreams(rmidi,
&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
SNDRV_RAWMIDI_STREAM_OUTPUT,
output_count);
if (err < 0) {
snd_rawmidi_free(rmidi);
return err;
}
if (err < 0)
goto error;
err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
if (err < 0) {
snd_rawmidi_free(rmidi);
return err;
}
if (err < 0)
goto error;
if (rrawmidi)
*rrawmidi = rmidi;
return 0;
error:
snd_rawmidi_free(rmidi);
return err;
}
EXPORT_SYMBOL(snd_rawmidi_new);
@ -1660,30 +1657,27 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
return -ENOMEM;
err = 0;
mutex_lock(&register_mutex);
if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
mutex_unlock(&register_mutex);
return -EBUSY;
}
list_add_tail(&rmidi->list, &snd_rawmidi_devices);
if (snd_rawmidi_search(rmidi->card, rmidi->device))
err = -EBUSY;
else
list_add_tail(&rmidi->list, &snd_rawmidi_devices);
mutex_unlock(&register_mutex);
if (err < 0)
return err;
err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
rmidi->card, rmidi->device,
&snd_rawmidi_f_ops, rmidi, &rmidi->dev);
if (err < 0) {
rmidi_err(rmidi, "unable to register\n");
mutex_lock(&register_mutex);
list_del(&rmidi->list);
mutex_unlock(&register_mutex);
return err;
goto error;
}
if (rmidi->ops && rmidi->ops->dev_register &&
(err = rmidi->ops->dev_register(rmidi)) < 0) {
snd_unregister_device(&rmidi->dev);
mutex_lock(&register_mutex);
list_del(&rmidi->list);
mutex_unlock(&register_mutex);
return err;
if (rmidi->ops && rmidi->ops->dev_register) {
err = rmidi->ops->dev_register(rmidi);
if (err < 0)
goto error_unregister;
}
#ifdef CONFIG_SND_OSSEMUL
rmidi->ossreg = 0;
@ -1735,6 +1729,14 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
}
#endif
return 0;
error_unregister:
snd_unregister_device(&rmidi->dev);
error:
mutex_lock(&register_mutex);
list_del(&rmidi->list);
mutex_unlock(&register_mutex);
return err;
}
static int snd_rawmidi_dev_disconnect(struct snd_device *device)