netdev - [net-next,v2,2/3] net: ethernet: adi: Add ADIN1110 support

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Date:   Wed, 27 Jul 2022 16:26:12 +0300
From:   <alexandru.tachici@...log.com>
To:     <andrew@...n.ch>
CC:     <alexandru.tachici@...log.com>, <d.michailidis@...gible.com>,
        <davem@...emloft.net>, <devicetree@...r.kernel.org>,
        <edumazet@...gle.com>, <geert+renesas@...der.be>,
        <geert@...ux-m68k.org>, <gerhard@...leder-embedded.com>,
        <joel@....id.au>, <krzysztof.kozlowski+dt@...aro.org>,
        <kuba@...nel.org>, <l.stelmach@...sung.com>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <robh+dt@...nel.org>, <stefan.wahren@...e.com>,
        <stephen@...workplumber.org>, <wellslutw@...il.com>
Subject: [net-next,v2,2/3] net: ethernet: adi: Add ADIN1110 support

> > +static irqreturn_t adin1110_irq(int irq, void *p)
> > +{
> > +	struct adin1110_priv *priv = p;
> > +	u32 status1;
> > +	u32 val;
> > +	int ret;
> > +	int i;
> > +
> > +	mutex_lock(&priv->lock);
> 
> The MDIO bus operations are using the same lock. MDIO can be quite
> slow. Do you really need mutual exclusion between MDIO and interrupts?
> What exactly is this lock protecting?
> 
>   Andrew

Hi Andrew,

Thanks for all the help here.

With this lock I am mainly protecting SPI read/writes. The hardware doesn't expose the MDIO pins.
In order to read/write a PHY reg, there has to be a SPI read/write to the device, the same
line where the MAC is programmed and ethernet frames are sent/received, not very efficient I know.

Best regards,
Alexandru