netdev - Re: [PATCH RFC 05/26] phy: improve safety of fixed-phy MII register reading

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Date:	Thu, 07 Jan 2016 11:50:36 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Russell King <rmk+kernel@....linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH RFC 05/26] phy: improve safety of fixed-phy MII register
 reading

On 07/12/15 09:37, Russell King wrote:
> There is no prevention of a concurrent call to both fixed_mdio_read()
> and fixed_phy_update_state(), which can result in the state being
> modified while it's being inspected.  Fix this by using a seqcount
> to detect modifications, and memcpy()ing the state.
> 
> We remain slightly naughty here, calling link_update() and updating
> the link status within the read-side loop - which would need rework
> of the design to change.
> 
> Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian