linux-kernel - Re: [PATCH net] net: stmmac: fix system hang caused by eee_ctrl

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Date:   Wed, 08 Sep 2021 11:40:05 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Joakim Zhang <qiangqing.zhang@....com>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, kuba@...nel.org,
        linux-imx@....com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: stmmac: fix system hang caused by eee_ctrl_timer
 during suspend/resume

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Wed,  8 Sep 2021 15:43:35 +0800 you wrote:
> commit 5f58591323bf ("net: stmmac: delete the eee_ctrl_timer after
> napi disabled"), this patch tries to fix system hang caused by eee_ctrl_timer,
> unfortunately, it only can resolve it for system reboot stress test. System
> hang also can be reproduced easily during system suspend/resume stess test
> when mount NFS on i.MX8MP EVK board.
> 
> In stmmac driver, eee feature is combined to phylink framework. When do
> system suspend, phylink_stop() would queue delayed work, it invokes
> stmmac_mac_link_down(), where to deactivate eee_ctrl_timer synchronizly.
> In above commit, try to fix issue by deactivating eee_ctrl_timer obviously,
> but it is not enough. Looking into eee_ctrl_timer expire callback
> stmmac_eee_ctrl_timer(), it could enable hareware eee mode again. What is
> unexpected is that LPI interrupt (MAC_Interrupt_Enable.LPIEN bit) is always
> asserted. This interrupt has chance to be issued when LPI state entry/exit
> from the MAC, and at that time, clock could have been already disabled.
> The result is that system hang when driver try to touch register from
> interrupt handler.
> 
> [...]

Here is the summary with links:
  - [net] net: stmmac: fix system hang caused by eee_ctrl_timer during suspend/resume
    https://git.kernel.org/netdev/net/c/276aae377206

You are awesome, thank you!
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