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

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Message-Id: <1197624375.4632.44.camel@gaivota>
Date:	Fri, 14 Dec 2007 07:26:15 -0200
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Shane <gnome42@...il.com>
Cc:	Adrian Bunk <bunk@...sta.de>, Adrian Bunk <bunk@...nel.org>,
	Brandon Philips <brandon@...p.org>,
	linux-kernel@...r.kernel.org,
	video4linux-list <video4linux-list@...hat.com>
Subject: Re: [2.6 patch] videobuf-core.c locking fixes


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

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