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Date:   Wed, 4 May 2022 00:26:22 +0200
From:   Andrew Lunn <andrew@lunn.ch>
To:     Lukas Wunner <lukas@wunner.de>
Cc:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
        linux-usb@vger.kernel.org,
        Steve Glendinning <steve.glendinning@shawell.net>,
        UNGLinuxDriver@microchip.com, Oliver Neukum <oneukum@suse.com>,
        Andre Edich <andre.edich@microchip.com>,
        Oleksij Rempel <linux@rempel-privat.de>,
        Martyn Welch <martyn.welch@collabora.com>,
        Gabriel Hojda <ghojda@yo2urs.ro>,
        Christoph Fritz <chf.fritz@googlemail.com>,
        Lino Sanfilippo <LinoSanfilippo@gmx.de>,
        Philipp Rosenberger <p.rosenberger@kunbus.com>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Ferry Toth <fntoth@gmail.com>
Subject: Re: [PATCH net-next v2 6/7] net: phy: smsc: Cache interrupt mask
Message-ID: <YnGsDtscYkh28PFm@lunn.ch>
References: <cover.1651574194.git.lukas@wunner.de>
 <e4a5d784e47bf919873e520e0c6c5156a1ecdde7.1651574194.git.lukas@wunner.de>
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On Tue, May 03, 2022 at 03:15:06PM +0200, Lukas Wunner wrote:
> Cache the interrupt mask to avoid re-reading it from the PHY upon every
> interrupt.
> 
> This will simplify a subsequent commit which detects hot-removal in the
> interrupt handler and bails out.
> 
> Analyzing and debugging PHY transactions also becomes simpler if such
> redundant reads are avoided.
> 
> Last not least, interrupt overhead and latency is slightly improved.
> 
> Tested-by: Oleksij Rempel <o.rempel@pengutronix.de> # LAN9514/9512/9500
> Tested-by: Ferry Toth <fntoth@gmail.com> # LAN9514
> Signed-off-by: Lukas Wunner <lukas@wunner.de>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew