linux-kernel - Re: [PATCH] s390/pci: Remove unnecessary if condition

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Date:	Fri, 29 Jul 2016 10:46:43 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Sebastian Ott <sebott@...ux.vnet.ibm.com>
cc:	Amitoj Kaur Chawla <amitoj1606@...il.com>,
	gerald.schaefer@...ibm.com, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org, julia.lawall@...6.fr
Subject: Re: [PATCH] s390/pci: Remove unnecessary if condition



On Fri, 29 Jul 2016, Sebastian Ott wrote:

> On Fri, 29 Jul 2016, Amitoj Kaur Chawla wrote:
> > Remove unnecessary error handling because the only failure value that
> > can be returned is NULL and so the test can never be true.
> >
> > The Coccinelle semantic patch used to make this change is as follows:
> > @@
> > expression e;
> > @@
> >
> >   e = debugfs_create_file(...);
> > - if(IS_ERR(e)) { e = NULL; }
>
> Nope. For !CONFIG_DEBUG_FS debugfs_create_file returns an ERR_PTR.

Clicking around in lxr doesn't show that, but perhaps an alternative
definition is overlooked?

julia