linux-kernel - Re: [PATCH v2 net] net: phy: mxl-gpy: add MDINT workaround

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Date:   Thu, 08 Dec 2022 04:10:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Michael Walle <michael@...le.cc>
Cc:     lxu@...linear.com, andrew@...n.ch, hkallweit1@...il.com,
        linux@...linux.org.uk, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net] net: phy: mxl-gpy: add MDINT workaround

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Mon,  5 Dec 2022 21:04:53 +0100 you wrote:
> At least the GPY215B and GPY215C has a bug where it is still driving the
> interrupt line (MDINT) even after the interrupt status register is read
> and its bits are cleared. This will cause an interrupt storm.
> 
> Although the MDINT is multiplexed with a GPIO pin and theoretically we
> could switch the pinmux to GPIO input mode, this isn't possible because
> the access to this register will stall exactly as long as the interrupt
> line is asserted. We exploit this very fact and just read a random
> internal register in our interrupt handler. This way, it will be delayed
> until the external interrupt line is released and an interrupt storm is
> avoided.
> 
> [...]

Here is the summary with links:
  - [v2,net] net: phy: mxl-gpy: add MDINT workaround
    https://git.kernel.org/netdev/net/c/5f4d487d01ff

You are awesome, thank you!
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