linux-kernel - Re: [PATCH v5 2/2] efi: a misc char interface for user to update efi firmware

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Date:	Wed, 9 Sep 2015 15:04:48 +0100
From:	'Matt Fleming' <matt@...eblueprint.co.uk>
To:	"Kweh, Hock Leong" <hock.leong.kweh@...el.com>
Cc:	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>,
	Sam Protsenko <semen.protsenko@...aro.org>,
	Peter Jones <pjones@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Roy Franz <roy.franz@...aro.org>,
	Borislav Petkov <bp@...en8.de>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	"Fleming, Matt" <matt.fleming@...el.com>
Subject: Re: [PATCH v5 2/2] efi: a misc char interface for user to update efi
 firmware

On Wed, 02 Sep, at 06:31:36AM, Kweh Hock Leong wrote:
> 
> I have done an experiment on that by using the misc char device file note.
> I included the flush() callback function to the fops. In flush(), I put a printk()
> and return -EINVAL. When I perform "cat XXX > /dev/XXX" on Intel Quark
> Galileo platform, I found that the flush() is not just being called at file
> close, it will also being called before the file write. And the error return, that I
> forced in the flush(), does not show up at shell terminal. This is the reason that
> I did not follow James recommendation and figure out to do it at write().

OK, that's interesting. Which cat tool is included with the Quark BSP?
 
-- 
Matt Fleming, Intel Open Source Technology Center
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