linux-kernel - Re: [PATCH RFC 1/6] ARM: pxa: Convert Spitz OHCI to GPIO descriptors

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Date:   Mon, 2 Oct 2023 10:00:04 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andy Shevchenko <andy@...nel.org>
Cc:     Kent Gibson <warthog618@...il.com>,
        Duje Mihanović <duje.mihanovic@...le.hr>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Russell King <linux@...linux.org.uk>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH RFC 1/6] ARM: pxa: Convert Spitz OHCI to GPIO descriptors

On Sun, Oct 1, 2023 at 11:22 AM Andy Shevchenko <andy@...nel.org> wrote:

 One more thing, though. I think those warnings are incomplete or actually
> reversed, and we outta use WARN_ON(IS_ERR(desc)), no?
>
> This way it will fix my concerns and your concerns will be satisfied, right?
> So, if gpiod_get() returns an error pointer and then we are trying to
> free it with GPIOLIB=n, _then_ we will got a warning and it's obvious that
> driver has to be prepared for that, otherwise if we have it NULL and
> call for gpiod_get_optional(), even with GPIOLIB=n, it's fine to free, we
> don't care.

Since we return return ERR_PTR(-ENOSYS) when compiled out
this sounds right to me!

Yours,
Linus Walleij