ALSA: snd-usb-usx2y: remove bogus frame checks

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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 4 insertions, 25 deletions

diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c
index 63fb5219f0f8..6234a51625b1 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 f2a1acdc4d83..814d0e887c62 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];