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| author | Karsten Wiese <fzu@wemgehoertderstaat.de> | 2011-01-03 02:41:58 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2011-01-11 19:48:58 +0100 |
| commit | 921eebdc18c82268eab446592191b39e35d031d6 (patch) | |
| tree | ada80734c2f0014dcfd236b64d429791c33fa114 /sound/usb | |
| parent | d1d7093f3f639e693fa763eb51d8d9c349bfd606 (diff) | |
| download | linux-stable-921eebdc18c82268eab446592191b39e35d031d6.tar.gz linux-stable-921eebdc18c82268eab446592191b39e35d031d6.tar.bz2 linux-stable-921eebdc18c82268eab446592191b39e35d031d6.zip | |
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>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/midi.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/sound/usb/midi.c b/sound/usb/midi.c index d7021cb01047..db2dc5ffe6dd 100644 --- a/sound/usb/midi.c +++ b/sound/usb/midi.c @@ -850,8 +850,8 @@ static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep, return; } - memset(urb->transfer_buffer + count, 0xFD, 9 - count); - urb->transfer_buffer_length = count; + memset(urb->transfer_buffer + count, 0xFD, ep->max_transfer - count); + urb->transfer_buffer_length = ep->max_transfer; } 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" */ ep->max_transfer = 4; 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) { buffer = usb_alloc_coherent(umidi->dev, |