[linux-dvb] PATCH for SAA7146 DMA buffer overflow in budget cards

Reinhard Nissl rnissl at gmx.de
Fri Mar 3 22:24:54 CET 2006


Hi,

Ingo Schneider wrote:

> Here comes a Patch which does the following changes for all ttpci budget 
> cards:
> - Issue a warning when more than 80% of the DMA buffer is being used 
> (probably due to bad IRQ latency)
>  Warnings are limited to the first 100 warnings and after that one 
> warning for every 100 buffer overruns.
> - Introduce a new parameter "bufsize" (in k) which increases the default 
> DMA buffer of 188k up to 4 MB
>  A buffer size of 470k does it for me even at high I/O load conditions.
> 
> Signed-off-by: Ingo Schneider <mail at ingo-schneider.de>

I'd like to try this patch, but it seems that the repository has changed 
meanwhile.

After applying the patch I get the following error when compiling:

   CC [M]  /store/soft/src/v4l-dvb/v4l/budget-patch.o
/store/soft/src/v4l-dvb/v4l/budget-patch.c: In function 
'budget_patch_attach':
/store/soft/src/v4l-dvb/v4l/budget-patch.c:683: error: 'TS_HEIGHT' 
undeclared (first use in this function)
/store/soft/src/v4l-dvb/v4l/budget-patch.c:683: error: (Each undeclared 
identifier is reported only once
/store/soft/src/v4l-dvb/v4l/budget-patch.c:683: error: for each function 
it appears in.)

I cannot solve this issue myself by substituting TS_HEIGHT with 
budget->buffer_width, as budget is first initialized past the above 
mentioned line.

Ingo: would you please provide an updated patch?

Bye.
-- 
Dipl.-Inform. (FH) Reinhard Nissl
mailto:rnissl at gmx.de



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