Author: thompsa
Date: Tue Jun 22 21:13:36 2010
New Revision: 209450
URL: http://svn.freebsd.org/changeset/base/209450
Log:
Reduce MIDI input buffer size to one USB packet, hence some USB devices don't
properly short terminate their transfers. This fixes a problem where input
appears several seconds late.
Reported by: Alexander Yerenkow
Submitted by: Hans Petter Selasky
Modified:
head/sys/dev/sound/usb/uaudio.c
Modified: head/sys/dev/sound/usb/uaudio.c
==============================================================================
--- head/sys/dev/sound/usb/uaudio.c Tue Jun 22 21:13:35 2010
(r209449)
+++ head/sys/dev/sound/usb/uaudio.c Tue Jun 22 21:13:36 2010
(r209450)
@@ -507,8 +507,8 @@ static const struct usb_config
.type = UE_BULK,
.endpoint = UE_ADDR_ANY,
.direction = UE_DIR_IN,
- .bufsize = UMIDI_BULK_SIZE,
- .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
+ .bufsize = 4, /* bytes */
+ .flags = {.pipe_bof = 1,.short_xfer_ok = 1,.proxy_buffer = 1,},
.callback = &umidi_bulk_read_callback,
},
@@ -3366,10 +3366,6 @@ umidi_bulk_read_callback(struct usb_xfer
DPRINTF("actlen=%d bytes\n", actlen);
- if (actlen == 0) {
- /* should not happen */
- goto tr_error;
- }
pos = 0;
pc = usbd_xfer_get_frame(xfer, 0);
@@ -3404,8 +3400,6 @@ umidi_bulk_read_callback(struct usb_xfer
return;
default:
-tr_error:
-
DPRINTF("error=%s\n", usbd_errstr(error));
if (error != USB_ERR_CANCELLED) {
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