linux-kernel - Re: [PATCH] Silence 'ignoring return value' warnings in drivers/video/aty/radeon

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Date:	Thu, 08 May 2008 17:02:44 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Greg KH <greg@...ah.com>, Cornelia Huck <cornelia.huck@...ibm.com>,
	benh@...nel.crashing.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, tony@...eyournoodle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Silence 'ignoring return value' warnings in
	drivers/video/aty/radeon_base.c

On Fri, 2008-05-09 at 09:50 +1000, Paul Mackerras wrote:
> Greg KH writes:
> 
> > > I hear you :) I found it useful, but it seems we should get rid of it
> > > for _create_file() now.
> > 
> > Why?  You point out it found some real bugs, should we just assume that
> > no new bugs of this same problem will happen again in the future?
> 
> Because it causes warnings for the callers which don't really care
> whether the file gets created or not, and getting rid of those
> warnings adds unnecessary bloat.
> 
> I think the best solution is to make a new sysfs_maybe_create_file()
> which isn't marked must_check, and then move suitable callers (such as
> radeonfb) over to that.  That will make it obvious in the callers that
> the file creation isn't guaranteed.

Or just a a flag parameter to the existing one that says whether failure
is allowed or not.  In a case that fails, a WARN_ON can be printed from
the common create_file rather than putting printks all over the kernel.

This would also document which files are necessary vs. optional.

Harvey

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