[ALSA] ppc-beep - handle errors from input_register_device()

ppc-beep: handle errors from input_register_device()
(Also fixed the wrong memory release in the error path.)

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/ppc/beep.c

@@ -215,15 +215,18 @@ int __init snd_pmac_attach_beep(struct snd_pmac *chip)
 {
 	struct pmac_beep *beep;
 	struct input_dev *input_dev;
+	struct snd_kcontrol *beep_ctl;
 	void *dmabuf;
 	int err = -ENOMEM;
 
 	beep = kzalloc(sizeof(*beep), GFP_KERNEL);
+	if (! beep)
+		return -ENOMEM;
 	dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
 				    &beep->addr, GFP_KERNEL);
 	input_dev = input_allocate_device();
-	if (!beep || !dmabuf || !input_dev)
-		goto fail;
+	if (! dmabuf || ! input_dev)
+		goto fail1;
 
 	/* FIXME: set more better values */
 	input_dev->name = "PowerMac Beep";
@@ -244,17 +247,24 @@ int __init snd_pmac_attach_beep(struct snd_pmac *chip)
 	beep->volume = BEEP_VOLUME;
 	beep->running = 0;
 
-	err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_pmac_beep_mixer, chip));
+	beep_ctl = snd_ctl_new1(&snd_pmac_beep_mixer, chip);
+	err = snd_ctl_add(chip->card, beep_ctl);
 	if (err < 0)
-		goto fail;
+		goto fail1;
+
+ 	chip->beep = beep;
 
-	chip->beep = beep;
-	input_register_device(beep->dev);
-
-	return 0;
-
- fail:	input_free_device(input_dev);
-	kfree(dmabuf);
+	err = input_register_device(beep->dev);
+	if (err)
+		goto fail2;
+
+ 	return 0;
+
+ fail2:	snd_ctl_remove(chip->card, beep_ctl);
+ fail1:	input_free_device(input_dev);
+	if (dmabuf)
+		dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
+				  dmabuf, beep->addr);
 	kfree(beep);
 	return err;
 }