linux-kernel - Re: [PATCH v1 1/1] gpiolib: Deduplicate cleanup for-loop in gpiochip_add_data_with

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Date: Thu, 22 Feb 2024 15:28:12 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] gpiolib: Deduplicate cleanup for-loop in
 gpiochip_add_data_with_key()

On Thu, Feb 22, 2024 at 10:48:00AM +0100, Bartosz Golaszewski wrote:
> On Wed, Feb 21, 2024 at 8:36 PM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> >
> > There is no need to repeat for-loop twice in the error path in
> > gpiochip_add_data_with_key(). Deduplicate it. While at it,
> > rename loop variable to be more specific and avoid ambguity.
> >
> > It also properly unwinds the SRCU, i.e. in reversed order of allocating.

..

> This doesn't apply on top of gpio/for-next, I think it depends on one
> of your earlier patches?

Yes, on the fix with error path.

..

> > +       while (desc_index--)
> 
> What about gdev->descs[0]?

What about it? :-)

for (i = i - 1; i >= 0; i--)
while (--i >= 0)
while (i--)

are all equivalents.

The difference is what the value will i get _after_ the loop.

-- 
With Best Regards,
Andy Shevchenko