netdev - Re: [PATCH net] net: phy: Fix deadlocking in phy

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Message-Id: 
 <169247006184.18695.13657924227141073910.git-patchwork-notify@kernel.org>
Date: Sat, 19 Aug 2023 18:34:21 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Serge Semin <fancer.lancer@...il.com>
Cc: andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 francesco.dolcini@...adex.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: phy: Fix deadlocking in phy_error() invocation

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@...emloft.net>:

On Fri, 18 Aug 2023 15:54:45 +0300 you wrote:
> Since commit 91a7cda1f4b8 ("net: phy: Fix race condition on link status
> change") all the phy_error() method invocations have been causing the
> nested-mutex-lock deadlock because it's normally done in the PHY-driver
> threaded IRQ handlers which since that change have been called with the
> phydev->lock mutex held. Here is the calls thread:
> 
> IRQ: phy_interrupt()
>      +-> mutex_lock(&phydev->lock); <--------------------+
>          drv->handle_interrupt()                         | Deadlock due
>          +-> ERROR: phy_error()                          + to the nested
>                     +-> phy_process_error()              | mutex lock
>                         +-> mutex_lock(&phydev->lock); <-+
>                             phydev->state = PHY_ERROR;
>                             mutex_unlock(&phydev->lock);
>          mutex_unlock(&phydev->lock);
> 
> [...]

Here is the summary with links:
  - [net] net: phy: Fix deadlocking in phy_error() invocation
    https://git.kernel.org/netdev/net/c/a0e026e7b37e

You are awesome, thank you!
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