linux-kernel - Re: [PATCH v2] pwm: improve args checking in pwm_apply

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Message-ID: <20160622204647.GA14996@google.com>
Date:	Wed, 22 Jun 2016 13:46:48 -0700
From:	Brian Norris <briannorris@...omium.org>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Linux PWM List <linux-pwm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Brian Norris <computersforpeace@...il.com>,
	Doug Anderson <dianders@...omium.org>,
	linux-renesas-soc@...r.kernel.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v2] pwm: improve args checking in pwm_apply_state()

On Wed, Jun 22, 2016 at 10:41:14PM +0200, Boris Brezillon wrote:
> On Wed, 22 Jun 2016 12:16:59 -0700
> Brian Norris <briannorris@...omium.org> wrote:
> > Notably, you're dropping the 'if (!pwm) { }' safety checks that are part
> > of pwm_disable() and pwm_set_polarity(). But I don't think there should
> > be any users relying on that.
> 
> Indeed. I can add it back here if you prefer,

Nah, that's ok. I just had to say it anyway :)

> but honestly, PWM users
> that are not checking the value returned by pwm_get() should be
> considered buggy IMHO, and a NULL pointer exception is a good way to
> make people realize they are not properly using the API :).

Seems OK.

Brian