ALSA: Return proper error code at probe in sound/usb/*

Some drivers in soudn/usb/* don't handle the error code properly
from snd_card_create().  This patch fixes these places.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 31 insertions, 20 deletions

diff --git a/sound/usb/usx2y/us122l.c b/sound/usb/usx2y/us122l.c
index b21bb475c0ff..98276aafefe6 100644
--- a/sound/usb/usx2y/us122l.c
+++ b/sound/usb/usx2y/us122l.c
@@ -478,7 +478,7 @@ static bool us122l_create_card(struct snd_card *card)
         return true;
 }
 
-static struct snd_card *usx2y_create_card(struct usb_device *device)
+static int usx2y_create_card(struct usb_device *device, struct snd_card **cardp)
 {
         int             dev;
         struct snd_card *card;
@@ -488,11 +488,11 @@ static struct snd_card *usx2y_create_card(struct usb_device *device)
                 if (enable[dev] && !snd_us122l_card_used[dev])
                         break;
         if (dev >= SNDRV_CARDS)
-                return NULL;
+                return -ENODEV;
         err = snd_card_create(index[dev], id[dev], THIS_MODULE,
                               sizeof(struct us122l), &card);
         if (err < 0)
-                return NULL;
+                return err;
         snd_us122l_card_used[US122L(card)->chip.index = dev] = 1;
 
         US122L(card)->chip.dev = device;
@@ -511,46 +511,57 @@ static struct snd_card *usx2y_create_card(struct usb_device *device)
                 US122L(card)->chip.dev->devnum
                 );
         snd_card_set_dev(card, &device->dev);
-        return card;
+        *cardp = card;
+        return 0;
 }
 
-static void *us122l_usb_probe(struct usb_interface *intf,
-                              const struct usb_device_id *device_id)
+static int us122l_usb_probe(struct usb_interface *intf,
+                            const struct usb_device_id *device_id,
+                            struct snd_card **cardp)
 {
         struct usb_device *device = interface_to_usbdev(intf);
-        struct snd_card *card = usx2y_create_card(device);
+        struct snd_card *card;
+        int err;
 
-        if (!card)
-                return NULL;
+        err = usx2y_create_card(device, &card);
+        if (err < 0)
+                return err;
 
-        if (!us122l_create_card(card) ||
-            snd_card_register(card) < 0) {
+        if (!us122l_create_card(card)) {
                 snd_card_free(card);
-                return NULL;
+                return -EINVAL;
+        }
+
+        err = snd_card_register(card);
+        if (err < 0) {
+                snd_card_free(card);
+                return err;
         }
 
         usb_get_dev(device);
-        return card;
+        *cardp = card;
+        return 0;
 }
 
 static int snd_us122l_probe(struct usb_interface *intf,
                             const struct usb_device_id *id)
 {
         struct snd_card *card;
+        int err;
+
         snd_printdd(KERN_DEBUG"%p:%i\n",
                     intf, intf->cur_altsetting->desc.bInterfaceNumber);
         if (intf->cur_altsetting->desc.bInterfaceNumber != 1)
                 return 0;
 
-        card = us122l_usb_probe(usb_get_intf(intf), id);
-
-        if (card) {
-                usb_set_intfdata(intf, card);
-                return 0;
+        err = us122l_usb_probe(usb_get_intf(intf), id, &card);
+        if (err < 0) {
+                usb_put_intf(intf);
+                return err;
         }
 
-        usb_put_intf(intf);
-        return -EIO;
+        usb_set_intfdata(intf, card);
+        return 0;
 }
 
 static void snd_us122l_disconnect(struct usb_interface *intf)