linux-kernel - Re: 2.6.25-rc[12] Video4Linux Bttv Regression

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Date:	Tue, 19 Feb 2008 01:21:36 +0200
From:	Bongani Hlope <bonganilinux@...b.co.za>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	video4linux-list@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: 2.6.25-rc[12] Video4Linux Bttv Regression

On Monday 18 February 2008 23:20:40 Bongani Hlope wrote:
> On Monday 18 February 2008 18:11:25 Mauro Carvalho Chehab wrote:
> > Have you tested Robert's patch?
>
> Sorry almost forgot, I have and it fixes the TV but not the radio.
>
> > I can't see anything wrong on bttv_g_tuner lock. I suspect that the
> > divide error caused some bad effects at some data on bttv.
>
>  The problems don't seem related because one is caused by opening the
> "radio" application, the divide error is caused by using a TV viewing
> application (I tried fbtv)
>
> > I've already applied his fix to my -git tree:
>
> Thanx, I'll try to bisect

I tried to bisect but the V4L/DVB changes are not bisect friendly, on two 
occursions I just selected "git bisect bad" because the bttv driver wouldn't 
compile, so I couldn't pin-point what causes the oops and hang.

Here are some few observations I made though (I started bisecting between 
2.6.24 and 2.6.25-rc1, saved me ~1000 commits):
1. On the third bisect, there's no oops my PC just hangs a I can't use any 
open terminals
2. When I reached the V4L/DVB changes, my PC did not hag or oops, the radio 
just didn't work (something about invalid VID**AUD**). This made it harder to 
bisect, because it is not working and not breaking so is it good or bad...

Cheers
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