linux-kernel - Re: [PATCH RESEND 6/6] clk: s5p-g2d: Fix incorrect usage of IS_ERR_OR

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Date:	Wed, 2 Jan 2013 09:28:54 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	Tony Prisk <linux@...sktech.co.nz>,
	Tomasz Stanislawski <t.stanislaws@...sung.com>,
	Dan Carpenter <error27@...il.com>,
	Sergei Shtylyov <sshtylyov@...sta.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org
Subject: Re: [PATCH RESEND 6/6] clk: s5p-g2d: Fix incorrect usage of
	IS_ERR_OR_NULL

On Wed, Jan 02, 2013 at 08:29:57AM +0100, Julia Lawall wrote:
> There are dereferences to the result of clk_get a few times.  I tried the 
> following semantic patch:

And those are buggy; struct clk is _SUPPOSED_ to be an OPAQUE COOKIE
and no one other than the clk code should be dereferencing it.

I guess this is the danger of the common clk API - we now have a struct
clk that is exposed in a linux/*.h include which anyone can include, and
now anyone can get a definition for a struct clk and dereference it,
destroying opaqueness of this cookie.
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