linux-kernel - Re: Re: [PATCH v2 3/3] efi: Capsule update with user helper interface

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Message-ID: <20150312224754.GD24174@codeblueprint.co.uk>
Date:	Thu, 12 Mar 2015 22:47:54 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Peter Jones <pjones@...hat.com>,
	"Kweh, Hock Leong" <hock.leong.kweh@...el.com>,
	Sam Protsenko <semen.protsenko@...aro.org>,
	Ming Lei <ming.lei@...onical.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Ong, Boon Leong" <boon.leong.ong@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>
Subject: Re: Re: [PATCH v2 3/3] efi: Capsule update with user helper interface

On Tue, 10 Mar, at 08:51:59AM, Andy Lutomirski wrote:
> 
> I'm not 100% happy with write(2) (which is all we have in sysfs) for
> two reasons:
> 
> 1. If we write a file name, eww.  That's more complicated, requires
> temporary files, has annoying mount namespace issues, etc.
> 
> 2. If we write the full contents, we need to do it in a single call to
> write.  That means that we can't use cat, which mostly defeats the
> purpose.  In fact, using cat could be actively harmful.

At this point I'd really like Greg to chime in.

In principal, I'm not stricly opposed to using a simple char device
provided that it's not essentially a copy and paste of code from
drivers/base/firmware_class.c.

Greg?

-- 
Matt Fleming, Intel Open Source Technology Center
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