linux-kernel - Re: [PATCH] efivarfs: Implement exclusive access for {get,set}

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Message-ID: <1349962956.15966.521.camel@mfleming-mobl1.ger.corp.intel.com>
Date:	Thu, 11 Oct 2012 14:42:36 +0100
From:	Matt Fleming <matt.fleming@...el.com>
To:	Jeremy Kerr <jeremy.kerr@...onical.com>
Cc:	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andy Whitcroft <apw@...onical.com>,
	Matthew Garrett <mjg@...hat.com>
Subject: Re: [PATCH] efivarfs: Implement exclusive access for
 {get,set}_variable

On Thu, 2012-10-11 at 21:19 +0800, Jeremy Kerr wrote:
> Currently, efivarfs does not enforce exclusion over the get_variable and
> set_variable operations. Section 7.1 of UEFI requires us to only allow a
> single processor to enter {get,set}_variable services at once.
> 
> This change acquires the efivars->lock over calls to these operations
> from the efivarfs paths.
> 
> Signed-off-by: Jeremy Kerr <jeremy.kerr@...onical.com>
> 
> ---
>  drivers/firmware/efivars.c |   68 +++++++++++++++++++++++--------------
>  1 file changed, 43 insertions(+), 25 deletions(-)

Thanks, applied to 'next'.


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