[PATCH 04/11] ALSA: scarlett2: Add missing error checks to *_ctl_get()

19 Dec 2023

The *_ctl_get() functions which call scarlett2_update_*() were not
checking the return value. Fix to check the return value and pass to
the caller.
Signed-off-by: Geoffrey D. Bennett g@b4.vu
Fixes: 9e4d5c1be21f ("ALSA: usb-audio: Scarlett Gen 2 mixer interface")
---
 sound/usb/mixer_scarlett2.c | 182 +++++++++++++++++++++++++-----------
 1 file changed, 130 insertions(+), 52 deletions(-)

diff --git a/sound/usb/mixer_scarlett2.c b/sound/usb/mixer_scarlett2.c
index 22285d8038c1..373911937487 100644
--- a/sound/usb/mixer_scarlett2.c
+++ b/sound/usb/mixer_scarlett2.c
@@ -2100,14 +2100,20 @@ static int scarlett2_sync_ctl_get(struct snd_kcontrol *kctl,
    struct usb_mixer_elem_info *elem = kctl->private_data;
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->sync_updated)
-		scarlett2_update_sync(mixer);
+
+	if (private->sync_updated) {
+		err = scarlett2_update_sync(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.enumerated.item[0] = private->sync;
-	mutex_unlock(&private->data_mutex);
-	return 0;
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static const struct snd_kcontrol_new scarlett2_sync_ctl = {
@@ -2190,14 +2196,20 @@ static int scarlett2_master_volume_ctl_get(struct snd_kcontrol *kctl,
    struct usb_mixer_elem_info *elem = kctl->private_data;
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->vol_updated)
-		scarlett2_update_volumes(mixer);
-	mutex_unlock(&private->data_mutex);
+	if (private->vol_updated) {
+		err = scarlett2_update_volumes(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.integer.value[0] = private->master_vol;
-	return 0;
+
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int line_out_remap(struct scarlett2_data *private, int index)
@@ -2223,14 +2235,20 @@ static int scarlett2_volume_ctl_get(struct snd_kcontrol *kctl,
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
    int index = line_out_remap(private, elem->control);
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->vol_updated)
-		scarlett2_update_volumes(mixer);
-	mutex_unlock(&private->data_mutex);
+	if (private->vol_updated) {
+		err = scarlett2_update_volumes(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.integer.value[0] = private->vol[index];
-	return 0;
+
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int scarlett2_volume_ctl_put(struct snd_kcontrol *kctl,
@@ -2297,14 +2315,20 @@ static int scarlett2_mute_ctl_get(struct snd_kcontrol *kctl,
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
    int index = line_out_remap(private, elem->control);
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->vol_updated)
-		scarlett2_update_volumes(mixer);
-	mutex_unlock(&private->data_mutex);
+	if (private->vol_updated) {
+		err = scarlett2_update_volumes(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.integer.value[0] = private->mute_switch[index];
-	return 0;
+
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int scarlett2_mute_ctl_put(struct snd_kcontrol *kctl,
@@ -2550,14 +2574,20 @@ static int scarlett2_level_enum_ctl_get(struct snd_kcontrol *kctl,
    const struct scarlett2_device_info *info = private->info;
int index = elem->control + info->level_input_first;
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->input_other_updated)
-		scarlett2_update_input_other(mixer);
+
+	if (private->input_other_updated) {
+		err = scarlett2_update_input_other(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.enumerated.item[0] = private->level_switch[index];
-	mutex_unlock(&private->data_mutex);
-	return 0;
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int scarlett2_level_enum_ctl_put(struct snd_kcontrol *kctl,
@@ -2608,15 +2638,21 @@ static int scarlett2_pad_ctl_get(struct snd_kcontrol *kctl,
    struct usb_mixer_elem_info *elem = kctl->private_data;
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->input_other_updated)
-		scarlett2_update_input_other(mixer);
+
+	if (private->input_other_updated) {
+		err = scarlett2_update_input_other(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.integer.value[0] =
    	private->pad_switch[elem->control];
-	mutex_unlock(&private->data_mutex);
-	return 0;
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int scarlett2_pad_ctl_put(struct snd_kcontrol *kctl,
@@ -2666,14 +2702,20 @@ static int scarlett2_air_ctl_get(struct snd_kcontrol *kctl,
    struct usb_mixer_elem_info *elem = kctl->private_data;
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->input_other_updated)
-		scarlett2_update_input_other(mixer);
+
+	if (private->input_other_updated) {
+		err = scarlett2_update_input_other(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.integer.value[0] = private->air_switch[elem->control];
-	mutex_unlock(&private->data_mutex);
-	return 0;
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int scarlett2_air_ctl_put(struct snd_kcontrol *kctl,
@@ -2723,15 +2765,21 @@ static int scarlett2_phantom_ctl_get(struct snd_kcontrol *kctl,
    struct usb_mixer_elem_info *elem = kctl->private_data;
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->input_other_updated)
-		scarlett2_update_input_other(mixer);
+
+	if (private->input_other_updated) {
+		err = scarlett2_update_input_other(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.integer.value[0] =
    	private->phantom_switch[elem->control];
-	mutex_unlock(&private->data_mutex);
-	return 0;
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int scarlett2_phantom_ctl_put(struct snd_kcontrol *kctl,
@@ -2903,14 +2951,20 @@ static int scarlett2_direct_monitor_ctl_get(
    struct usb_mixer_elem_info *elem = kctl->private_data;
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = elem->head.mixer->private_data;
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->monitor_other_updated)
-		scarlett2_update_monitor_other(mixer);
+
+	if (private->monitor_other_updated) {
+		err = scarlett2_update_monitor_other(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.enumerated.item[0] = private->direct_monitor_switch;
-	mutex_unlock(&private->data_mutex);
-	return 0;
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int scarlett2_direct_monitor_ctl_put(
@@ -3010,14 +3064,20 @@ static int scarlett2_speaker_switch_enum_ctl_get(
    struct usb_mixer_elem_info *elem = kctl->private_data;
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->monitor_other_updated)
-		scarlett2_update_monitor_other(mixer);
+
+	if (private->monitor_other_updated) {
+		err = scarlett2_update_monitor_other(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.enumerated.item[0] = private->speaker_switching_switch;
-	mutex_unlock(&private->data_mutex);
-	return 0;
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
/* when speaker switching gets enabled, switch the main/alt speakers
@@ -3165,14 +3225,20 @@ static int scarlett2_talkback_enum_ctl_get(
    struct usb_mixer_elem_info *elem = kctl->private_data;
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->monitor_other_updated)
-		scarlett2_update_monitor_other(mixer);
+
+	if (private->monitor_other_updated) {
+		err = scarlett2_update_monitor_other(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.enumerated.item[0] = private->talkback_switch;
-	mutex_unlock(&private->data_mutex);
-	return 0;
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int scarlett2_talkback_enum_ctl_put(
@@ -3320,14 +3386,20 @@ static int scarlett2_dim_mute_ctl_get(struct snd_kcontrol *kctl,
    struct usb_mixer_elem_info *elem = kctl->private_data;
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->vol_updated)
-		scarlett2_update_volumes(mixer);
-	mutex_unlock(&private->data_mutex);
+	if (private->vol_updated) {
+		err = scarlett2_update_volumes(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.integer.value[0] = private->dim_mute[elem->control];
-	return 0;
+
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int scarlett2_dim_mute_ctl_put(struct snd_kcontrol *kctl,
@@ -3698,14 +3770,20 @@ static int scarlett2_mux_src_enum_ctl_get(struct snd_kcontrol *kctl,
    struct usb_mixer_interface *mixer = elem->head.mixer;
    struct scarlett2_data *private = mixer->private_data;
    int index = line_out_remap(private, elem->control);
+	int err = 0;
mutex_lock(&private->data_mutex);
-	if (private->mux_updated)
-		scarlett2_usb_get_mux(mixer);
+
+	if (private->mux_updated) {
+		err = scarlett2_usb_get_mux(mixer);
+		if (err < 0)
+			goto unlock;
+	}
    ucontrol->value.enumerated.item[0] = private->mux[index];
-	mutex_unlock(&private->data_mutex);
-	return 0;
+unlock:
+	mutex_unlock(&private->data_mutex);
+	return err;
 }
static int scarlett2_mux_src_enum_ctl_put(struct snd_kcontrol *kctl,
-- 
2.43.0


    