linux-kernel - Re: [PATCH v4 2/2] efi: an sysfs interface for user to update efi firmware

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Message-ID: <CALCETrWeW8Gp9QFGCVhPmNo_Z+xsCJN7LYMPD6XNc92_dKMz3g@mail.gmail.com>
Date:	Tue, 14 Apr 2015 11:52:48 -0400
From:	Andy Lutomirski <luto@...capital.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	"Kweh, Hock Leong" <hock.leong.kweh@...el.com>,
	Ming Lei <ming.lei@...onical.com>,
	Matt Fleming <matt@...sole-pimps.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>,
	Sam Protsenko <semen.protsenko@...aro.org>,
	Peter Jones <pjones@...hat.com>,
	Roy Franz <roy.franz@...aro.org>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH v4 2/2] efi: an sysfs interface for user to update efi firmware

On Tue, Apr 14, 2015 at 10:09 AM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Tue, Apr 14, 2015 at 05:44:56PM +0800, Kweh, Hock Leong wrote:
>> From: "Kweh, Hock Leong" <hock.leong.kweh@...el.com>
>>
>> Introducing a kernel module to expose capsule loader interface
>> for user to upload capsule binaries. This module leverage the
>> request_firmware_direct_full_path() to obtain the binary at a
>> specific path input by user.
>>
>> Example method to load the capsule binary:
>> echo -n "/path/to/capsule/binary" > /sys/devices/platform/efi_capsule_loader/capsule_loader
>
> Ick, why not just have the firmware file location present, and copy it
> to the sysfs file directly from userspace, instead of this two-step
> process?

Because it's not at all obvious how error handling should work in that case.

--Andy
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