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

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Message-Id: <20080506145608.565b61bf.akpm@linux-foundation.org>
Date:	Tue, 6 May 2008 14:56:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	tony@...eyournoodle.com, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org
Subject: Re: [PATCH] Silence 'ignoring return value' warnings in
 drivers/video/aty/radeon_base.c

On Tue, 06 May 2008 14:43:01 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Andrew Morton <akpm@...ux-foundation.org>
> Date: Tue, 6 May 2008 14:39:36 -0700
> 
> > On Thu, 24 Apr 2008 14:34:01 +1000
> > tony@...eyournoodle.com (Tony Breeds) wrote:
> > 
> > > Current kernel builds warn about:
> > > drivers/video/aty/radeon_base.c: In function 'radeonfb_pci_register':
> > > drivers/video/aty/radeon_base.c:2334: warning: ignoring return value of 'sysfs_create_bin_file', declared with attribute warn_unused_result
> > > drivers/video/aty/radeon_base.c:2336: warning: ignoring return value of 'sysfs_create_bin_file', declared with attribute warn_unused_result
> > > 
> > > Do minimal checking of these functions and issue a warning if either
> > > fails.  They don't seem to be critical..
> > 
> > well OK, but I object to the patch title!
> > 
> > The point isn't to silence warnings.  It is to fix the problem which that
> > warning is drawing our attention to.
> > 
> > So I rewrote the title to "drivers/video/aty/radeon_base.c: notify user if
> > sysfs_create_bin_file() failed".
> > 
> > And your fix looks appropriate - if sysfs_create_bin_file() fails we will now get
> > reports of this and we can find out what kernel bug caused this to happen.
> 
> The last time someone "fixed" this warning in the radeon driver,
> people lost their consoles.
> 
> Just giving a heads up...

heh, thanks.

This one just emits a warning:

@@ -2340,9 +2341,12 @@ static int __devinit radeonfb_pci_regist
 
 	/* Register some sysfs stuff (should be done better) */
 	if (rinfo->mon1_EDID)
-		sysfs_create_bin_file(&rinfo->pdev->dev.kobj, &edid1_attr);
+		err |= sysfs_create_bin_file(&rinfo->pdev->dev.kobj, &edid1_attr);
 	if (rinfo->mon2_EDID)
-		sysfs_create_bin_file(&rinfo->pdev->dev.kobj, &edid2_attr);
+		err |= sysfs_create_bin_file(&rinfo->pdev->dev.kobj, &edid2_attr);
+	if (err)
+		pr_warning("%s() Creating sysfs files failed, continuing\n",
+		           __func__);
 
 	/* save current mode regs before we switch into the new one
 	 * so we can restore this upon __exit
_


So from what you say, it sounds like we will be seeing that warning.  I
wonder why.
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