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

Andy Lutomirski
2015-04-14T15:53:20Z

On Tue, Apr 14, 2015 at 10:09 AM, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
> On Tue, Apr 14, 2015 at 05:44:56PM +0800, Kweh, Hock Leong wrote:
>> From: "Kweh, Hock Leong" <hock.leong.kweh@intel.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