Re: [2.6 patch] videobuf-core.c locking fixes

[Mauro Carvalho Chehab <mchehab@infradead.org>]

Em Qua, 2007-12-12 às 16:22 -0500, Shane escreveu:
> > Yes it does! I was just going to send the same patch myself :)
> 
> But, I am now seeing some errors that weren't there in 2.6.23
> 
> kernel: bttv0: SCERR @ 1fa0401c,bits: HSYNC OFLOW SCERR*
> last message repeated 15 times
> kernel: bttv0: timeout: drop=16 irq=105615/105615, risc=1fa0401c,
> bits: HSYNC OFLOW
> kernel: bttv0: reset, reinitialize
> kernel: bttv0: PLL can sleep, using XTAL (28636363).
> 
> kernel: bttv0: SCERR @ 1fa0401c,bits: HSYNC OFLOW SCERR*
> last message repeated 15 times
> kernel: bttv0: timeout: drop=16 irq=106741/106741, risc=1fa0401c,
> bits: HSYNC OFLOW
> kernel: bttv0: reset, reinitialize
> kernel: bttv0: PLL can sleep, using XTAL (28636363).
> 
> These happen occasionally and it causes an EIO DQBUF
> error and the application has to re queue the buffers but it
> recovers OK. Not sure if it causes some sort of internal
> kernel corruption that will only be noticed later possibly?
> 
> I am using 15 userptr buffers so whatever is happening may
> be happening once per buffer sometimes. dunno

You may see such troubles with weak signals, where bttv is not capable of getting the proper sync.

-- 
Cheers,
Mauro