netdev - Re: [PATCH net v2] net: phy: Fix race condition on link status change

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Date:   Tue, 10 May 2022 01:00:12 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Francesco Dolcini <francesco.dolcini@...adex.com>
Cc:     andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        qiangqing.zhang@....com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH net v2] net: phy: Fix race condition on link status change

Hello:

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

On Fri,  6 May 2022 08:08:15 +0200 you wrote:
> This fixes the following error caused by a race condition between
> phydev->adjust_link() and a MDIO transaction in the phy interrupt
> handler. The issue was reproduced with the ethernet FEC driver and a
> micrel KSZ9031 phy.
> 
> [  146.195696] fec 2188000.ethernet eth0: MDIO read timeout
> [  146.201779] ------------[ cut here ]------------
> [  146.206671] WARNING: CPU: 0 PID: 571 at drivers/net/phy/phy.c:942 phy_error+0x24/0x6c
> [  146.214744] Modules linked in: bnep imx_vdoa imx_sdma evbug
> [  146.220640] CPU: 0 PID: 571 Comm: irq/128-2188000 Not tainted 5.18.0-rc3-00080-gd569e86915b7 #9
> [  146.229563] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
> [  146.236257]  unwind_backtrace from show_stack+0x10/0x14
> [  146.241640]  show_stack from dump_stack_lvl+0x58/0x70
> [  146.246841]  dump_stack_lvl from __warn+0xb4/0x24c
> [  146.251772]  __warn from warn_slowpath_fmt+0x5c/0xd4
> [  146.256873]  warn_slowpath_fmt from phy_error+0x24/0x6c
> [  146.262249]  phy_error from kszphy_handle_interrupt+0x40/0x48
> [  146.268159]  kszphy_handle_interrupt from irq_thread_fn+0x1c/0x78
> [  146.274417]  irq_thread_fn from irq_thread+0xf0/0x1dc
> [  146.279605]  irq_thread from kthread+0xe4/0x104
> [  146.284267]  kthread from ret_from_fork+0x14/0x28
> [  146.289164] Exception stack(0xe6fa1fb0 to 0xe6fa1ff8)
> [  146.294448] 1fa0:                                     00000000 00000000 00000000 00000000
> [  146.302842] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [  146.311281] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
> [  146.318262] irq event stamp: 12325
> [  146.321780] hardirqs last  enabled at (12333): [<c01984c4>] __up_console_sem+0x50/0x60
> [  146.330013] hardirqs last disabled at (12342): [<c01984b0>] __up_console_sem+0x3c/0x60
> [  146.338259] softirqs last  enabled at (12324): [<c01017f0>] __do_softirq+0x2c0/0x624
> [  146.346311] softirqs last disabled at (12319): [<c01300ac>] __irq_exit_rcu+0x138/0x178
> [  146.354447] ---[ end trace 0000000000000000 ]---
> 
> [...]

Here is the summary with links:
  - [net,v2] net: phy: Fix race condition on link status change
    https://git.kernel.org/netdev/net/c/91a7cda1f4b8

You are awesome, thank you!
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