linux-kernel - Re: [patch 5/9 v3] efi: export more efi table variable to sysfs

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Message-ID: <20131122025140.GD3874@dhcp-16-126.nay.redhat.com>
Date:	Fri, 22 Nov 2013 10:51:40 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	x86@...nel.org, mjg59@...f.ucam.org, hpa@...or.com,
	James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
	ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.infradead.org, bp@...en8.de, matt@...sole-pimps.org,
	toshi.kani@...com
Subject: Re: [patch 5/9 v3] efi: export more efi table variable to sysfs

> > +
> > +	if (efi.config_table != EFI_INVALID_TABLE_ADDR) {
> > +		error = sysfs_create_file(efi_kobj,
> > +					&efi_attr_config_table.attr);
> > +		if (error) {
> > +			pr_err("efi: Sysfs attribute %s export failed with error %d.\n",
> > +				efi_attr_config_table.attr.name, error);
> > +			goto err_remove_runtime;
> > +		}
> > +	}
> 
> You don't need to do this "if SOMETHING then create the file", just use
> the "is_visible" attribute in the group to do this as a callback to
> determine this when the group is registered.

I did not know the is_visible before, thanks for the hint, will use it

--
Thanks for review
Dave
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