linux-kernel - Re: [PATCH net-next 1/4] net: phy: broadcom: add exp register access methods without buslock

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Message-ID: <1335ee64-f337-3121-b694-9c164113b891@gmail.com>
Date:   Sat, 9 May 2020 16:47:31 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Michael Walle <michael@...le.cc>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 1/4] net: phy: broadcom: add exp register access
 methods without buslock



On 5/9/2020 3:37 PM, Michael Walle wrote:
> Add helper to read and write expansion registers without taking the mdio
> lock.
> 
> Please note, that this changes the semantics of the read and write.
> Before there was no lock between selecting the expansion register and
> the actual read/write. This may lead to access failures if there are
> parallel accesses. Instead take the bus lock during the whole access
> cycle.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>

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