Re: [PATCH 5/9] gpiolib: use gpio_chips list in gpiochip_find_base
From: Grant Likely
Date: Sat Feb 09 2013 - 05:10:25 EST
On Wed, 6 Feb 2013 13:48:19 +0900, Alex Courbot <acourbot@xxxxxxxxxx> wrote:
> On 02/06/2013 02:21 AM, Linus Walleij wrote:
> > This looks like it is preserving this userspace-sensitive semantic
> > so that dynamically added chips will still get the same assigned
> > numbers.
> It does (it should, at least), the assigned ranges should be strictly
> identical to the previous version. While testing I also made sure all
> chips had the same GPIO range.
> > But I want some guarantees, so state clearly in the commit
> > that any dynamically assigned chip will get the same base
> > address after this change as it got before it, and please take
> > this opportunity to add a comment stating that this search
> > method is vital for userspace ABIs, and must be preserved.
> Done. I will take the blame if something goes wrong. :)
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