I applied the patch by hand to my current source tree (3.10.11) and compiled the kernel from scratch.
I plugged a MIDI cable between midi in and out on the TASCAM US-122. Using QJackCtl, I connected the US-122's MIDI out to fluidsynth, and used amidiplay to send play a MIDI file to the US-122.
While the MIDI was playing, I used Audacity to record the audio via the US-122's mic inputs holding the mic close to the speakers. After about 10 seconds, I rewound audacity and hit record again so that it was both playing and recording through the US-122 while the US-122 was also routing MIDI.
This appears to work fine (at 44100Hz sampling; I've not tried any others), and I reckon this is a pretty severe test.
Thank you for pushing this patch which seems to resolve the original issue. This will be particularly appreciated by many because the US-122, no longer supported for Windows I believe, is currently available on eBay for about £30 in the UK, and represents an inexpensive way for Linux users to make reasonable quality recordings from microphones needing a phantom power source.
On Wednesday 02 October 2013 16:49:50 Daniel Mack wrote:
The frame check in i_usX2Y_urb_complete() and i_usX2Y_usbpcm_urb_complete() is bogus and produces false positives as described in this LAU thread:
http://linuxaudio.org/mailarchive/lau/2013/5/20/200177
This patch removes the check code entirely.
Cc: fzu@wemgehoertderstaat.de Reported-by: Dr Nicholas J Bailey nicholas.bailey@glasgow.ac.uk Suggested-by: Takashi Iwai tiwai@suse.de Signed-off-by: Daniel Mack zonque@gmail.com
sound/usb/usx2y/usbusx2yaudio.c | 22 +++------------------- sound/usb/usx2y/usx2yhwdeppcm.c | 7 +------ 2 files changed, 4 insertions(+), 25 deletions(-)
diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c index 63fb521..6234a51 100644 --- a/sound/usb/usx2y/usbusx2yaudio.c +++ b/sound/usb/usx2y/usbusx2yaudio.c @@ -299,19 +299,6 @@ static void usX2Y_error_urb_status(struct usX2Ydev *usX2Y, usX2Y_clients_stop(usX2Y); }
-static void usX2Y_error_sequence(struct usX2Ydev *usX2Y,
struct snd_usX2Y_substream *subs, struct urb *urb)-{
- snd_printk(KERN_ERR
-"Sequence Error!(hcd_frame=%i ep=%i%s;wait=%i,frame=%i).\n" -"Most probably some urb of usb-frame %i is still missing.\n" -"Cause could be too long delays in usb-hcd interrupt handling.\n",
usb_get_current_frame_number(usX2Y->dev),subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out",usX2Y->wait_iso_frame, urb->start_frame, usX2Y->wait_iso_frame);- usX2Y_clients_stop(usX2Y);
-}
static void i_usX2Y_urb_complete(struct urb *urb) { struct snd_usX2Y_substream *subs = urb->context; @@ -328,12 +315,9 @@ static void i_usX2Y_urb_complete(struct urb *urb) usX2Y_error_urb_status(usX2Y, subs, urb); return; }
- if (likely((urb->start_frame & 0xFFFF) == (usX2Y->wait_iso_frame &
0xFFFF))) - subs->completed_urb = urb;
- else {
usX2Y_error_sequence(usX2Y, subs, urb);return;- }
- subs->completed_urb = urb;
- { struct snd_usX2Y_substream *capsubs =
usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE], *playbacksubs = usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK]; diff --git a/sound/usb/usx2y/usx2yhwdeppcm.c b/sound/usb/usx2y/usx2yhwdeppcm.c index f2a1acd..814d0e8 100644 --- a/sound/usb/usx2y/usx2yhwdeppcm.c +++ b/sound/usb/usx2y/usx2yhwdeppcm.c @@ -244,13 +244,8 @@ static void i_usX2Y_usbpcm_urb_complete(struct urb *urb) usX2Y_error_urb_status(usX2Y, subs, urb); return; }
- if (likely((urb->start_frame & 0xFFFF) == (usX2Y->wait_iso_frame &
0xFFFF))) - subs->completed_urb = urb;
- else {
usX2Y_error_sequence(usX2Y, subs, urb);return;- }
- subs->completed_urb = urb; capsubs = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE]; capsubs2 = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE + 2]; playbacksubs = usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];