ALSA: snd-usb: mixer: propagate errors up the call chain
Daniel Mack [Tue, 19 Mar 2013 20:09:24 +0000 (21:09 +0100)]
commit 4d7b86c98e445b075c2c4c3757eb6d3d6efbe72e upstream.

In check_input_term() and parse_audio_feature_unit(), propagate the
error value that has been returned by a failing function instead of
-EINVAL. That helps cleaning up the error pathes in the mixer.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

sound/usb/mixer.c

index 15b0712..05159b5 100644 (file)
@@ -711,8 +711,9 @@ static int check_input_term(struct mixer_build *state, int id, struct usb_audio_
                case UAC2_CLOCK_SELECTOR: {
                        struct uac_selector_unit_descriptor *d = p1;
                        /* call recursively to retrieve the channel info */
-                       if (check_input_term(state, d->baSourceID[0], term) < 0)
-                               return -ENODEV;
+                       err = check_input_term(state, d->baSourceID[0], term);
+                       if (err < 0)
+                               return err;
                        term->type = d->bDescriptorSubtype << 16; /* virtual type */
                        term->id = id;
                        term->name = uac_selector_unit_iSelector(d);
@@ -1263,8 +1264,9 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void
                return err;
 
        /* determine the input source type and name */
-       if (check_input_term(state, hdr->bSourceID, &iterm) < 0)
-               return -EINVAL;
+       err = check_input_term(state, hdr->bSourceID, &iterm);
+       if (err < 0)
+               return err;
 
        master_bits = snd_usb_combine_bytes(bmaControls, csize);
        /* master configuration quirks */