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ALSA: usb-audio: Fix implicit fb endpoint setup by quirk 

commit 2bc16b9f32 upstream.

The commit a60945fd08 ("ALSA: usb-audio: move implicit fb quirks to
separate function") introduced an error in the handling of quirks for
implicit feedback endpoints. This commit fixes this.

If a quirk successfully sets up an implicit feedback endpoint, usb-audio
no longer tries to find the implicit fb endpoint itself.

Fixes: a60945fd08 ("ALSA: usb-audio: move implicit fb quirks to separate function")
Signed-off-by: Manuel Reinhardt <manuel.rhdt@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manuel Reinhardt 2019-01-31 15:32:35 +01:00 committed by Greg Kroah-Hartman
parent adeb5603ab
commit c504b84d7f
1 changed files with 8 additions and 1 deletions
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9
sound/usb/pcm.c
View File

@ -313,6 +313,9 @@ static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
return 0;
}
/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
* applies. Returns 1 if a quirk was found.
*/
static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
struct usb_device *dev,
struct usb_interface_descriptor *altsd,
@ -391,7 +394,7 @@ add_sync_ep:
subs->data_endpoint->sync_master = subs->sync_endpoint;
return 0;
return 1;
}
static int set_sync_endpoint(struct snd_usb_substream *subs,
@ -430,6 +433,10 @@ static int set_sync_endpoint(struct snd_usb_substream *subs,
if (err < 0)
return err;
/* endpoint set by quirk */
if (err > 0)
return 0;
if (altsd->bNumEndpoints < 2)
return 0;