linux-kernel - Re: [PATCH v4 2/2] Input: bcm-keypad: Add Broadcom keypad controller

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Date:	Mon, 2 Mar 2015 13:59:15 -0800
From:	Scott Branden <sbranden@...adcom.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	<bcm-kernel-feedback-list@...adcom.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"Ian Campbell" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Ray Jui <rjui@...adcom.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazao <anatol@...gle.com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] Input: bcm-keypad: Add Broadcom keypad controller

Hi Dmitry,

I understand what's missing now.

Thanks,
  Scott

On 15-03-02 12:23 PM, Dmitry Torokhov wrote:
> Hi Scott,
>
>>> Hmm, also bcm_kp_start() and bcm_kp_stop() should check if kp->clk is
>>> valid before trying to enable/disable it.
>>>
>> I checked and other keyboard drivers do not check this.  I return an
>> error in bcm_kp_start if the clk enable fails.  On stop, if the clk
>> is not valid something is really, really wrong as well.
>
> The other drivers simply abort probe() if they can't get clock, you
> decided to allow probe() to finish and assume that clock is already
> enabled, leaving kp->clk == ERR_PTR(-ENOENT) in your version. If you try
> then calling clk_prepare_enable() with that pointer it is going to bomb,
> that is why I said you need to check pointer validity in bcm_kp_start()
> and bcm_kp_stop().
>
> Thanks.
>

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