[PATCH 14/41] ALSA: usb-audio: Create endpoint objects at parsing phase - Pioneer DJ DJM-250MK2 stopped working

[Takashi Iwai]

On Sun, 03 Jan 2021 19:15:48 +0100,
František Kučera wrote:
> 
> Dne 03. 01. 21 v 18:19 Takashi Iwai napsal(a):
> > Could you give lsusb -v output as well as /proc/asound/card*/usbmixer
> > and stream* files?  The proc files are at best from both older and new
> > kernels.
> 
> Here are the files. They look same. The only difference is in the stream0, but it is probably only formatting. I also attached the kern.log from the new version.

Thanks.

It must be something specific to the devices with the fixed stream
qurik.  Could you try the patch below?


Takashi

-- 8< --
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -155,9 +155,6 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
 
 	stream = (fp->endpoint & USB_DIR_IN)
 		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
-	err = snd_usb_add_audio_stream(chip, stream, fp);
-	if (err < 0)
-		goto error;
 	if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
 	    fp->altset_idx >= iface->num_altsetting) {
 		err = -EINVAL;
@@ -176,6 +173,11 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
 		fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 	if (fp->maxpacksize == 0)
 		fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
+
+	err = snd_usb_add_audio_stream(chip, stream, fp);
+	if (err < 0)
+		goto error;
+
 	usb_set_interface(chip->dev, fp->iface, 0);
 	snd_usb_init_pitch(chip, fp);
 	snd_usb_init_sample_rate(chip, fp, fp->rate_max);