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

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Message-ID: <20121012044901.GA17913@kroah.com>
Date:	Fri, 12 Oct 2012 13:49:01 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Matt Fleming <matt.fleming@...el.com>
Cc:	Jeremy Kerr <jeremy.kerr@...onical.com>, 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, Oct 11, 2012 at 02:42:36PM +0100, Matt Fleming wrote:
> 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'.

Should this be backported to the stable kernels?

thanks,

greg k-h
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