[ALSA] aoa: fix up i2sbus_attach_codec

This patch changes i2sbus_attach_codec to implement a proper error handling
strategy using labels to jump to the right part. Since it has an elaborate
set-up sequence it also needs that tear-down, which I had hard-coded
inbetween all the checks. This increases readability and should reduce .text
size as well.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 26 insertions, 46 deletions

diff --git a/sound/aoa/soundbus/i2sbus/i2sbus-pcm.c b/sound/aoa/soundbus/i2sbus/i2sbus-pcm.c
index 051bb9b200ee..7c81db7e52c1 100644
--- a/sound/aoa/soundbus/i2sbus/i2sbus-pcm.c
+++ b/sound/aoa/soundbus/i2sbus/i2sbus-pcm.c
@@ -812,7 +812,6 @@ static void i2sbus_private_free(struct snd_pcm *pcm)
         module_put(THIS_MODULE);
 }
 
-/* FIXME: this function needs an error handling strategy with labels */
 int
 i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
                     struct codec_info *ci, void *data)
@@ -880,24 +879,21 @@ i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
         if (!cii->sdev) {
                 printk(KERN_DEBUG
                        "i2sbus: failed to get soundbus dev reference\n");
-                kfree(cii);
-                return -ENODEV;
+                err = -ENODEV;
+                goto out_free_cii;
         }
 
         if (!try_module_get(THIS_MODULE)) {
                 printk(KERN_DEBUG "i2sbus: failed to get module reference!\n");
-                soundbus_dev_put(dev);
-                kfree(cii);
-                return -EBUSY;
+                err = -EBUSY;
+                goto out_put_sdev;
         }
 
         if (!try_module_get(ci->owner)) {
                 printk(KERN_DEBUG
                        "i2sbus: failed to get module reference to codec owner!\n");
-                module_put(THIS_MODULE);
-                soundbus_dev_put(dev);
-                kfree(cii);
-                return -EBUSY;
+                err = -EBUSY;
+                goto out_put_this_module;
         }
 
         if (!dev->pcm) {
@@ -905,11 +901,7 @@ i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
                                   &dev->pcm);
                 if (err) {
                         printk(KERN_DEBUG "i2sbus: failed to create pcm\n");
-                        kfree(cii);
-                        module_put(ci->owner);
-                        soundbus_dev_put(dev);
-                        module_put(THIS_MODULE);
-                        return err;
+                        goto out_put_ci_module;
                 }
                 dev->pcm->dev = &dev->ofdev.dev;
         }
@@ -923,20 +915,12 @@ i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
                         /* eh? */
                         printk(KERN_ERR
                                "Can't attach same bus to different cards!\n");
-                        module_put(ci->owner);
-                        kfree(cii);
-                        soundbus_dev_put(dev);
-                        module_put(THIS_MODULE);
-                        return -EINVAL;
-                }
-                if ((err =
-                     snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1))) {
-                        module_put(ci->owner);
-                        kfree(cii);
-                        soundbus_dev_put(dev);
-                        module_put(THIS_MODULE);
-                        return err;
+                        err = -EINVAL;
+                        goto out_put_ci_module;
                 }
+                err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1);
+                if (err)
+                        goto out_put_ci_module;
                 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
                                 &i2sbus_playback_ops);
                 i2sdev->out.created = 1;
@@ -946,20 +930,11 @@ i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
                 if (dev->pcm->card != card) {
                         printk(KERN_ERR
                                "Can't attach same bus to different cards!\n");
-                        module_put(ci->owner);
-                        kfree(cii);
-                        soundbus_dev_put(dev);
-                        module_put(THIS_MODULE);
-                        return -EINVAL;
-                }
-                if ((err =
-                     snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1))) {
-                        module_put(ci->owner);
-                        kfree(cii);
-                        soundbus_dev_put(dev);
-                        module_put(THIS_MODULE);
-                        return err;
+                        goto out_put_ci_module;
                 }
+                err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1);
+                if (err)
+                        goto out_put_ci_module;
                 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
                                 &i2sbus_record_ops);
                 i2sdev->in.created = 1;
@@ -974,11 +949,7 @@ i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
         err = snd_device_register(card, dev->pcm);
         if (err) {
                 printk(KERN_ERR "i2sbus: error registering new pcm\n");
-                module_put(ci->owner);
-                kfree(cii);
-                soundbus_dev_put(dev);
-                module_put(THIS_MODULE);
-                return err;
+                goto out_put_ci_module;
         }
         /* no errors any more, so let's add this to our list */
         list_add(&cii->list, &dev->codec_list);
@@ -993,6 +964,15 @@ i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
                 64 * 1024, 64 * 1024);
 
         return 0;
+ out_put_ci_module:
+        module_put(ci->owner);
+ out_put_this_module:
+        module_put(THIS_MODULE);
+ out_put_sdev:
+        soundbus_dev_put(dev);
+ out_free_cii:
+        kfree(cii);
+        return err;
 }
 
 void i2sbus_detach_codec(struct soundbus_dev *dev, void *data)