linux-kernel - Re: [PATCH 2/7] usb: fsl_udc_core: check return value of create_proc_read

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Message-ID: <20100801061934.GB2650@albatros>
Date:	Sun, 1 Aug 2010 10:19:34 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	Dan Carpenter <error27@...il.com>, kernel-janitors@...r.kernel.org,
	Li Yang <leoli@...escale.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Dinh Nguyen <Dinh.Nguyen@...escale.com>,
	Anton Vorontsov <avorontsov@...mvista.com>,
	linux-usb@...r.kernel.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] usb: fsl_udc_core: check return value of
 create_proc_read_entry()

On Sat, Jul 31, 2010 at 21:17 +0200, Dan Carpenter wrote:
> On Sat, Jul 31, 2010 at 09:38:20PM +0400, Kulikov Vasiliy wrote:
> > create_proc_read_entry() may fail, if so return -ENOMEM.
> > 
> 
> It can fail, but also we return NULL if procfs is disabled.  I haven't
> looked at it very carefully, would this patch break the module if procfs
> was disabled?
Probably you are right, but many drivers in tree compare return value
with NULL. Some of them interpret this as error, some of them simply
call pr_warn("Hmm, I cannot create file in proc, strange..."). Maybe
there is more simplier way to check it without #ifdefs?

> 
> The same applies to the similar patches in this set.
> 
> regards,
> dan carpenter
> 
> 
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