netdev - Re: [PATCH net] net: phy: Warn about incorrect mdio_bus_phy

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Date:   Thu, 04 Aug 2022 02:40:14 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, opendmb@...il.com, andrew@...n.ch,
        hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: phy: Warn about incorrect mdio_bus_phy_resume()
 state

Hello:

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

On Mon,  1 Aug 2022 16:34:03 -0700 you wrote:
> Calling mdio_bus_phy_resume() with neither the PHY state machine set to
> PHY_HALTED nor phydev->mac_managed_pm set to true is a good indication
> that we can produce a race condition looking like this:
> 
> CPU0						CPU1
> bcmgenet_resume
>  -> phy_resume
>    -> phy_init_hw
>  -> phy_start
>    -> phy_resume
>                                                 phy_start_aneg()
> mdio_bus_phy_resume
>  -> phy_resume
>     -> phy_write(..., BMCR_RESET)
>      -> usleep()                                  -> phy_read()
> 
> [...]

Here is the summary with links:
  - [net] net: phy: Warn about incorrect mdio_bus_phy_resume() state
    https://git.kernel.org/netdev/net/c/744d23c71af3

You are awesome, thank you!
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