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ALSA: snd-usb-us122l: Fix MIDI output 

The US-122L always reads 9 bytes per urb unless they are set to 0xFD.

Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Cc: stable@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Karsten Wiese 2011-01-03 02:41:58 +01:00 committed by Takashi Iwai
parent d1d7093f3f
commit 921eebdc18
1 changed files with 9 additions and 2 deletions
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11
sound/usb/midi.c
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@ -850,8 +850,8 @@ static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep,
return; return;
} }
memset(urb->transfer_buffer + count, 0xFD, 9 - count); memset(urb->transfer_buffer + count, 0xFD, ep->max_transfer - count);
urb->transfer_buffer_length = count; urb->transfer_buffer_length = ep->max_transfer;
} }
static struct usb_protocol_ops snd_usbmidi_122l_ops = { static struct usb_protocol_ops snd_usbmidi_122l_ops = {
@ -1295,6 +1295,13 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi,
case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */ case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */
ep->max_transfer = 4; ep->max_transfer = 4;
break; break;
/*
* Some devices only work with 9 bytes packet size:
*/
case USB_ID(0x0644, 0x800E): /* Tascam US-122L */
case USB_ID(0x0644, 0x800F): /* Tascam US-144 */
ep->max_transfer = 9;
break;
} }
for (i = 0; i < OUTPUT_URBS; ++i) { for (i = 0; i < OUTPUT_URBS; ++i) {
buffer = usb_alloc_coherent(umidi->dev, buffer = usb_alloc_coherent(umidi->dev,