netdev - Re: [net-2.6 PATCH 4/5] e1000e: separate mutex usage between NVM and PHY/CSR register for ICHx/PCH

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Message-Id: <20091026.161722.242384657.davem@davemloft.net>
Date:	Mon, 26 Oct 2009 16:17:22 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com, bruce.w.allan@...el.com
Subject: Re: [net-2.6 PATCH 4/5] e1000e: separate mutex usage between NVM
 and PHY/CSR register for ICHx/PCH

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Mon, 26 Oct 2009 14:23:43 -0700

> From: Bruce Allan <bruce.w.allan@...el.com>
> 
> Accesses to NVM and PHY/CSR registers on ICHx/PCH-based parts are protected
> from concurrent accesses with a mutex that is acquired when the access is
> initiated and released when the access has completed.  However, the two
> types of accesses should not be protected by the same mutex because the
> driver may have to access the NVM while already holding the mutex over
> several consecutive PHY/CSR accesses which would result in livelock.
> 
> Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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