linux-kernel - Re: [alsa-devel] [PATCH] Fix debugfs_create_dir's error checking method for sound/soc/

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Message-ID: <s5hd4hzw8ck.wl%tiwai@suse.de>
Date:	Fri, 17 Oct 2008 17:26:51 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Zhaolei <zhaolei@...fujitsu.com>
Cc:	Mark Brown <broonie@...ena.org.uk>, alsa-devel@...a-project.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	lrg@...mlogic.co.uk
Subject: Re: [alsa-devel] [PATCH] Fix debugfs_create_dir's error checking	method for sound/soc/

At Fri, 17 Oct 2008 17:21:21 +0200,
I wrote:
> 
> At Fri, 17 Oct 2008 14:23:42 +0100,
> Mark Brown wrote:
> > 
> > On Fri, Oct 17, 2008 at 09:04:55PM +0800, Zhaolei wrote:
> > 
> > > debugfs_create_dir() returns NULL if an error occurs, returns -ENODEV
> > > when debugfs is not enabled in the kernel.
> > 
> > ...
> > 
> > >  	asoc_debugfs = debugfs_create_dir("asoc", NULL);
> > > -	if (!IS_ERR(asoc_debugfs))
> > > +	if (!IS_ERR(asoc_debugfs) && asoc_debugfs)
> > >  		debugfs_create_u32("dapm_pop_time", 0744, asoc_debugfs,
> > >  				   &pop_time);
> > 
> > Hrmpf.  This looks like something that should be fixed in debugfs -
> > using both error reporting strategies is rather unhelpful and we're
> > actually loosing information in the case where debugfs is built.  I'll
> > send a patch and see what people thing.
> 
> This looks like a design.  In linux/debugfs.h:

Oh, and I applied the patch now to sound git tree, BTW.
Thanks!


Takashi
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