linux-kernel - Re: [PATCHv2 1/1] omap: Ptr "isr_reg" tracked as NULL was dereferenced

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Date:	Mon, 18 Oct 2010 16:11:47 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Evgeny Kuznetsov <EXT-Eugeny.Kuznetsov@...ia.com>
Cc:	"ext Varadarajan, Charulatha" <charu@...com>,
	linux-omap@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Balbi, Felipe" <balbi@...com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"khilman@...prootsystems.com" <khilman@...prootsystems.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"tero.kristo@...ia.com" <tero.kristo@...ia.com>
Subject: Re: [PATCHv2 1/1] omap: Ptr "isr_reg" tracked as NULL was
 dereferenced

* Evgeny Kuznetsov <EXT-Eugeny.Kuznetsov@...ia.com> [101014 23:11]:
> On Wed, 2010-10-13 at 16:09 +0400, Evgeny Kuznetsov wrote:
> > On Wed, 2010-10-13 at 17:20 +0530, ext Varadarajan, Charulatha wrote:
> Hi Tony,
> 
> It is not a bug fix, it is just check to prevent potential issues. Used
> to warn in case of bug and prevent kernel oops. Check added only here
> (not all gpio code cleanup) since here it could cause kernel opps.
> 
> Would you apply patch if I will leave only if condition section in
> patch?
> 
> 	if (WARN_ON(!isr_reg))
> 		goto exit;
> 
> If yes, I'll resend v3 patch.

Sounds like a valid check to me.

Tony
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