ALSA: snd-usb: try harder to find USB_DT_CS_ENDPOINT

[pandora-kernel.git] / sound / usb / stream.c

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 5ff8010..33a335b 100644 (file)
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -168,6 +168,14 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
        if (!csep && altsd->bNumEndpoints >= 2)
                csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
 
+       /*
+        * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
+        * bytes after the first endpoint, go search the entire interface.
+        * Some devices have it directly *before* the standard endpoint.
+        */
+       if (!csep)
+               csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
+
        if (!csep || csep->bLength < 7 ||
            csep->bDescriptorSubtype != UAC_EP_GENERAL) {
                snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"