linux-kernel - Re: Q: return of pinctrl_register and handing at drivers that use this function

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Message-ID: <CACRpkda5nYmAT3-fkxdYQEGpi6U=L-kphQEu3naoxPzO9a-7pQ@mail.gmail.com>
Date:	Mon, 18 Jun 2012 13:52:06 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	"devendra.aaru" <devendra.aaru@...il.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Q: return of pinctrl_register and handing at drivers that use
 this function

On Mon, Jun 18, 2012 at 1:47 PM, devendra.aaru <devendra.aaru@...il.com> wrote:

> since the pinctrl_register returns a pointer of structure type "struct
> pinctrl_dev" or NULL if it was failed to register the pinctrl driver,
> so IS_ERR checking is not required?

Yes. (Unless I did something wrong.)

> My understanding about IS_ERR is that its used when the pointer
> addresses are kind of error codes rather actual addresses,
> but are a kind of return codes of functions returning integer types.

You are absolutely right.

Yours,
Linus Walleij
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