Re: [PATCH v3 2/2] i2c: change id to let i2c-at91 work

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org>]

On 18:25 Tue 16 Oct     , Bo Shen wrote:
> Hi J,
> 
> On 10/16/2012 16:39, Jean-Christophe PLAGNIOL-VILLARD wrote:
> >On 11:13 Tue 16 Oct     , Bo Shen wrote:
> >>Hi J,
> >>
> >>On 10/15/2012 23:02, Jean-Christophe PLAGNIOL-VILLARD wrote:
> >>>On 17:30 Mon 15 Oct     , Bo Shen wrote:
> >>>>The i2c core driver will turn the platform device ID to busnum
> >>>>When using platfrom device ID as -1, it means dynamically assigned
> >>>>the busnum. When writing code, we need to make sure the busnum,
> >>>>and call i2c_register_board_info(int busnum, ...) to register device
> >>>>if using -1, we do not know the value of busnum
> >>>>	
> >>>>In order to solve this issue, set the platform device ID as a fix number
> >>>>Here using 0 to match the busnum used in i2c_regsiter_board_info()
> >>>>
> >>>>Signed-off-by: Bo Shen <voice.shen-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
> >>>>---
> >>>
> >>>can you check when this append for the first time to schedule a patch for stable too
> >>
> >>OK. I will resend it and add linux stable into the cc list.
> >no this not how it work
> >
> >I ask you to check which patch add the regression and then when this is
> >applied in the kernel we will request greg to apply it too to the stable
> 
> The code is using id = -1 appear 4 years ago. And after dig, I don't
> find which patch cause this the regression.
so use git bisect to find the commit responsible

Best Regards,
J.