linux-kernel - Re: [PATCH 2/3] clk: bcm281xx: add initial clock framework support

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Date:	Wed, 04 Dec 2013 07:57:39 -0600
From:	Alex Elder <alex.elder@...aro.org>
To:	Mark Rutland <mark.rutland@....com>
CC:	Christian Daudt <bcm@...thebug.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Pawel Moll <Pawel.Moll@....com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Mike Turquette <mturquette@...aro.org>,
	"bcm-kernel-feedback-list@...adcom.com" 
	<bcm-kernel-feedback-list@...adcom.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] clk: bcm281xx: add initial clock framework support

On 12/04/2013 07:06 AM, Alex Elder wrote:
>>> +       name_size = strlen(node->name) + 1;
>>> >> +       ccu = kzalloc(sizeof(*ccu) + name_size, GFP_KERNEL);
>>> >> +       if (!ccu) {
>>> >> +               pr_err("%s: unable to map allocate CCU struct for %s\n",
>>> >> +                       __func__, node->name);
>>> >> +               return;
>>> >> +       }
>>> >> +       memcpy((char *)ccu->name, node->name, name_size);
>> > 
>> > You could simplify this with kstrdup.
> You are correct, and I will make that change.  I think at
> one point I needed the length but that doesn't appear to
> be the case here.

On second thought, no, you may have missed what was happening here.
I was avoiding two kmallocs() by setting aside space at the end
of the structure to hold its name.  It may seem silly, but this
avoids a possible (well, conceivable) failure case.

However, based on your earlier question about "what about freeing
ccu->name?" I am going to use kstrdup() here.  I'd rather the code
put you at ease than look weird just to avoid an unlikely failure.

					-Alex

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