1 files changed, 26 insertions, 28 deletions

diff --git a/sound/usb/6fire/chip.c b/sound/usb/6fire/chip.c
index 33e962178c93..5ff78814e687 100644
--- a/sound/usb/6fire/chip.c
+++ b/sound/usb/6fire/chip.c
@@ -61,8 +61,10 @@ static void usb6fire_chip_abort(struct sfire_chip *chip)
 	}
 }
 
-static void usb6fire_chip_destroy(struct sfire_chip *chip)
+static void usb6fire_card_free(struct snd_card *card)
 {
+	struct sfire_chip *chip = card->private_data;
+
 	if (chip) {
 		if (chip->pcm)
 			usb6fire_pcm_destroy(chip);
@@ -72,8 +74,6 @@ static void usb6fire_chip_destroy(struct sfire_chip *chip)
 			usb6fire_comm_destroy(chip);
 		if (chip->control)
 			usb6fire_control_destroy(chip);
-		if (chip->card)
-			snd_card_free(chip->card);
 	}
 }
 
@@ -88,24 +88,22 @@ static int usb6fire_chip_probe(struct usb_interface *intf,
 	struct snd_card *card = NULL;
 
 	/* look if we already serve this card and return if so */
-	mutex_lock(&register_mutex);
-	for (i = 0; i < SNDRV_CARDS; i++) {
-		if (devices[i] == device) {
-			if (chips[i])
-				chips[i]->intf_count++;
-			usb_set_intfdata(intf, chips[i]);
-			mutex_unlock(&register_mutex);
-			return 0;
-		} else if (!devices[i] && regidx < 0)
-			regidx = i;
-	}
-	if (regidx < 0) {
-		mutex_unlock(&register_mutex);
-		dev_err(&intf->dev, "too many cards registered.\n");
-		return -ENODEV;
+	scoped_guard(mutex, &register_mutex) {
+		for (i = 0; i < SNDRV_CARDS; i++) {
+			if (devices[i] == device) {
+				if (chips[i])
+					chips[i]->intf_count++;
+				usb_set_intfdata(intf, chips[i]);
+				return 0;
+			} else if (!devices[i] && regidx < 0)
+				regidx = i;
+		}
+		if (regidx < 0) {
+			dev_err(&intf->dev, "too many cards registered.\n");
+			return -ENODEV;
+		}
+		devices[regidx] = device;
 	}
-	devices[regidx] = device;
-	mutex_unlock(&register_mutex);
 
 	/* check, if firmware is present on device, upload it if not */
 	ret = usb6fire_fw_init(intf);
@@ -125,8 +123,8 @@ static int usb6fire_chip_probe(struct usb_interface *intf,
 		dev_err(&intf->dev, "cannot create alsa card.\n");
 		return ret;
 	}
-	strcpy(card->driver, "6FireUSB");
-	strcpy(card->shortname, "TerraTec DMX6FireUSB");
+	strscpy(card->driver, "6FireUSB");
+	strscpy(card->shortname, "TerraTec DMX6FireUSB");
 	sprintf(card->longname, "%s at %d:%d", card->shortname,
 			device->bus->busnum, device->devnum);
 
@@ -136,6 +134,7 @@ static int usb6fire_chip_probe(struct usb_interface *intf,
 	chip->regidx = regidx;
 	chip->intf_count = 1;
 	chip->card = card;
+	card->private_free = usb6fire_card_free;
 
 	ret = usb6fire_comm_init(chip);
 	if (ret < 0)
@@ -162,7 +161,7 @@ static int usb6fire_chip_probe(struct usb_interface *intf,
 	return 0;
 
 destroy_chip:
-	usb6fire_chip_destroy(chip);
+	snd_card_free(card);
 	return ret;
 }
 
@@ -174,14 +173,13 @@ static void usb6fire_chip_disconnect(struct usb_interface *intf)
 	if (chip) { /* if !chip, fw upload has been performed */
 		chip->intf_count--;
 		if (!chip->intf_count) {
-			mutex_lock(&register_mutex);
-			devices[chip->regidx] = NULL;
-			chips[chip->regidx] = NULL;
-			mutex_unlock(&register_mutex);
+			scoped_guard(mutex, &register_mutex) {
+				devices[chip->regidx] = NULL;
+				chips[chip->regidx] = NULL;
+			}
 
 			chip->shutdown = true;
 			usb6fire_chip_abort(chip);
-			usb6fire_chip_destroy(chip);
 		}
 	}
 }