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authorTakashi Iwai <tiwai@suse.de>2018-07-17 22:45:50 +0200
committerTakashi Iwai <tiwai@suse.de>2018-07-17 22:48:38 +0200
commit7fdc9b08071b6a3fc85bf90b79e13f6e973a7e5e (patch)
treeaec2c291cfe26eaea3c06c6766bf2369170f1452 /sound/core/rawmidi.c
parent5bed9139727f3bad06c9444bd092336a59397e9d (diff)
downloadlinux-7fdc9b08071b6a3fc85bf90b79e13f6e973a7e5e.tar.bz2
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>
Diffstat (limited to 'sound/core/rawmidi.c')
-rw-r--r--sound/core/rawmidi.c76
1 files changed, 39 insertions, 37 deletions
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 14dec13ecde9..6b24c2d2dae6 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -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)