linux-kernel - Re: [PATCHv5 2/4] wiegand: add Wiegand bus driver

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Message-ID: <ZOda5RY/2yW6Y63Q@smile.fi.intel.com>
Date:   Thu, 24 Aug 2023 16:28:05 +0300
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Martin Zaťovič <m.zatovic1@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, linus.walleij@...aro.org,
        quic_jhugo@...cinc.com, nipun.gupta@....com, tzimmermann@...e.de,
        ogabbay@...nel.org, mathieu.poirier@...aro.org, axboe@...nel.dk,
        damien.lemoal@...nsource.wdc.com, linux@...y.sk, arnd@...db.de,
        yangyicong@...ilicon.com, benjamin.tissoires@...hat.com,
        masahiroy@...nel.org, jacek.lawrynowicz@...ux.intel.com,
        geert+renesas@...der.be, devicetree@...r.kernel.org
Subject: Re: [PATCHv5 2/4] wiegand: add Wiegand bus driver

On Thu, Aug 24, 2023 at 02:53:13PM +0200, Martin Zaťovič wrote:
> On Thu, Aug 24, 2023 at 01:40:35PM +0200, Greg KH wrote:
> > On Thu, Aug 24, 2023 at 01:10:13PM +0200, Martin Zaťovič wrote:

...

> > > +static inline void wiegand_controller_put(void *ptr)
> > 
> > Why is this a void *?  It should be "struct wiegand_controller *"
> 
> It is a void* because it is being passed to devm_add_action_or_reset()
> and this function only accepts a pointer to a function that accepts a void*
> parameter. I am not sure if there is a way around it.

I just replied with a deeper review with the answer to this.

> > Please never use void * if at all possible.

Correct. We better to have a type checking when possible. Esp. for the exported
functions.

-- 
With Best Regards,
Andy Shevchenko