Commit 52c3e317 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: usb-audio: Unify the release of usb_mixer_elem_info objects 



Instead of the direct kfree() calls, introduce a new local helper to
release the usb_mixer_elem_info object.  This will be extended to do
more than a single kfree() in the later patches.

Also, use the standard goto instead of multiple calls in
parse_audio_selector_unit() error paths.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 68e9fde2

sound/usb/mixer.c

+28 −20
Original line number Diff line number Diff line
@@ -1026,10 +1026,15 @@ static struct usb_feature_control_info audio_feature_info[] = { 
	{ UAC2_FU_PHASE_INVERTER,	 "Phase Inverter Control", USB_MIXER_BOOLEAN, -1 },

};



static void usb_mixer_elem_info_free(struct usb_mixer_elem_info *cval)

{

	kfree(cval);

}



/* private_free callback */

void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl)

{

	kfree(kctl->private_data);

	usb_mixer_elem_info_free(kctl->private_data);

	kctl->private_data = NULL;

}
@@ -1552,7 +1557,7 @@ static void __build_feature_ctl(struct usb_mixer_interface *mixer, 


	ctl_info = get_feature_control_info(control);

	if (!ctl_info) {

		kfree(cval);

		usb_mixer_elem_info_free(cval);

		return;

	}

	if (mixer->protocol == UAC_VERSION_1)
@@ -1585,7 +1590,7 @@ static void __build_feature_ctl(struct usb_mixer_interface *mixer, 


	if (!kctl) {

		usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");

		kfree(cval);

		usb_mixer_elem_info_free(cval);

		return;

	}

	kctl->private_free = snd_usb_mixer_elem_free;
@@ -1755,7 +1760,7 @@ static void build_connector_control(struct usb_mixer_interface *mixer, 
	kctl = snd_ctl_new1(&usb_connector_ctl_ro, cval);

	if (!kctl) {

		usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");

		kfree(cval);

		usb_mixer_elem_info_free(cval);

		return;

	}

	get_connector_control_name(mixer, term, is_input, kctl->id.name,
@@ -1808,7 +1813,7 @@ static int parse_clock_source_unit(struct mixer_build *state, int unitid, 
	kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);



	if (!kctl) {

		kfree(cval);

		usb_mixer_elem_info_free(cval);

		return -ENOMEM;

	}
@@ -2070,7 +2075,7 @@ static void build_mixer_unit_ctl(struct mixer_build *state, 
	kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);

	if (!kctl) {

		usb_audio_err(state->chip, "cannot malloc kcontrol\n");

		kfree(cval);

		usb_mixer_elem_info_free(cval);

		return;

	}

	kctl->private_free = snd_usb_mixer_elem_free;
@@ -2468,7 +2473,7 @@ static int build_audio_procunit(struct mixer_build *state, int unitid, 


		kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);

		if (!kctl) {

			kfree(cval);

			usb_mixer_elem_info_free(cval);

			return -ENOMEM;

		}

		kctl->private_free = snd_usb_mixer_elem_free;
@@ -2606,7 +2611,7 @@ static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl) 
	if (kctl->private_data) {

		struct usb_mixer_elem_info *cval = kctl->private_data;

		num_ins = cval->max;

		kfree(cval);

		usb_mixer_elem_info_free(cval);

		kctl->private_data = NULL;

	}

	if (kctl->private_value) {
@@ -2678,10 +2683,10 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid, 
		break;

	}



	namelist = kmalloc_array(desc->bNrInPins, sizeof(char *), GFP_KERNEL);

	namelist = kcalloc(desc->bNrInPins, sizeof(char *), GFP_KERNEL);

	if (!namelist) {

		kfree(cval);

		return -ENOMEM;

		err = -ENOMEM;

		goto error_cval;

	}

#define MAX_ITEM_NAME_LEN	64

	for (i = 0; i < desc->bNrInPins; i++) {
@@ -2689,11 +2694,8 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid, 
		len = 0;

		namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);

		if (!namelist[i]) {

			while (i--)

				kfree(namelist[i]);

			kfree(namelist);

			kfree(cval);

			return -ENOMEM;

			err = -ENOMEM;

			goto error_name;

		}

		len = check_mapped_selector_name(state, unitid, i, namelist[i],

						 MAX_ITEM_NAME_LEN);
@@ -2707,10 +2709,8 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid, 
	kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);

	if (! kctl) {

		usb_audio_err(state->chip, "cannot malloc kcontrol\n");

		for (i = 0; i < desc->bNrInPins; i++)

			kfree(namelist[i]);

		kfree(namelist);

		kfree(cval);

		err = -ENOMEM;

		goto error_name;

		return -ENOMEM;

	}

	kctl->private_value = (unsigned long)namelist;
@@ -2757,6 +2757,14 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid, 
	usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",

		    cval->head.id, kctl->id.name, desc->bNrInPins);

	return snd_usb_mixer_add_control(&cval->head, kctl);



 error_name:

	for (i = 0; i < desc->bNrInPins; i++)

		kfree(namelist[i]);

	kfree(namelist);

 error_cval:

	usb_mixer_elem_info_free(cval);

	return err;

}



/*

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