linux-kernel - Re: [PATCH] gpiolib: fix device

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Date:	Tue, 3 Nov 2009 23:47:47 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Sergei Shtylyov <sshtylyov@...mvista.com>,
	linux-kernel@...r.kernel.org, david-b@...bell.net,
	Greg KH <greg@...ah.com>, Kay Sievers <kay.sievers@...y.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] gpiolib: fix device_create() result check

On Tue, 3 Nov 2009 14:44:01 -0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Tue, 20 Oct 2009 20:35:23 +0400
> Sergei Shtylyov <sshtylyov@...mvista.com> wrote:
> 
> > In case of failure, device_create() returns not NULL but the error code.
> > The current code checks for non-NULL though which causes kernel oops in
> > sysfs_create_group() when device_create() fails.  Check for error using
> > IS_ERR() and propagate the error value using PTR_ERR() instead of fixed
> > -ENODEV code returned now...
> 
> Does anyone notice any missing information here?

its what you get for cheap hacks instead of having a ptr_err_t which is a
union so you have to get it right ;)

Alan
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