tm6000 and losing blocks

[Stefan Ringel <stefan.ringel@arcor.de>]

Hi Mauro,

I have tested your patch, but that logic to detect the end of urb is wrong. Many blocks going to lost. 
byte 0x47 can 2 different state:
1. sync byte
2. data byte

Your logic has that problem, that if receive the new urb and search the new sync byte, the first 0x47 will use and 
that are not always the sync byte.

>From: Mauro Carvalho Chehab <mchehab@redhat.com>
>Date: Mon, 7 Jun 2010 15:10:14 +0000 (-0300)
>Subject: tm6000: Fix copybuf continue logic
>X-Git-Url: http://git.linuxtv.org/v4l-dvb.git?a=commitdiff_plain;h=dcdc55b917681378f84e6db26dcd56931ae2f1c8
>
>tm6000: Fix copybuf continue logic
>Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
>---
>
>diff --git a/drivers/staging/tm6000/tm6000-video.c b/drivers/staging/tm6000/tm6000-video.c
>index 6bf2b13..9a0b5a7 100644
>--- a/drivers/staging/tm6000/tm6000-video.c
>+++ b/drivers/staging/tm6000/tm6000-video.c
>@@ -285,7 +285,7 @@ static int copy_streams(u8 *data, unsigned long len,
> 				break;
> 			case TM6000_URB_MSG_AUDIO:
> 			case TM6000_URB_MSG_PTS:
>-				cpysize = pktsize;	/* Size is always 180 bytes */
>+				size = pktsize;		/* Size is always 180 bytes */
> 				break;
> 			}
> 		} else {
>@@ -315,7 +315,7 @@ static int copy_streams(u8 *data, unsigned long len,
> 				break;
> 			}
> 		}
>-		if (ptr + pktsize > endp) {
>+		if (cpysize < size) {
> 			/* End of URB packet, but cmd processing is not
> 			 * complete. Preserve the state for a next packet
> 			 */

I think that is wrong

>@@ -323,7 +323,7 @@ static int copy_streams(u8 *data, unsigned long len,
> 			dev->isoc_ctl.size = size - cpysize;
> 			dev->isoc_ctl.cmd = cmd;
> 			dev->isoc_ctl.pktsize = pktsize - (endp - ptr);
>-			ptr += endp - ptr;
>+			ptr += cpysize;
> 		} else {
> 			dev->isoc_ctl.cmd = 0;
> 			ptr += pktsize;

dito


Stefan Ringel

-- 
Stefan Ringel <stefan.ringel@arcor.de>