linux-kernel - Re: [PATCH 0/6] backport patches to improve clocks management for stmmac driver

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Message-ID: <YZemteFqu3/5ryNL@kroah.com>
Date:   Fri, 19 Nov 2021 14:29:25 +0100
From:   Greg KH <greg@...ah.com>
To:     Meng Li <Meng.Li@...driver.com>
Cc:     stable@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        mcoquelin.stm32@...il.com, linux@...linux.org.uk, andrew@...n.ch,
        qiangqing.zhang@....com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 0/6] backport patches to improve clocks management for
 stmmac driver

On Fri, Nov 19, 2021 at 10:53:53AM +0800, Meng Li wrote:
> From: Meng Li <meng.li@...driver.com>
> 
> In stable kernel v5.10, when run below command to remove ethernet driver on
> stratix10 platform, there will be warning trace as below:
> 
> $ cd /sys/class/net/eth0/device/driver/
> $ echo ff800000.ethernet > unbind
> 
> WARNING: CPU: 3 PID: 386 at drivers/clk/clk.c:810 clk_core_unprepare+0x114/0x274
> Modules linked in: sch_fq_codel
> CPU: 3 PID: 386 Comm: sh Tainted: G        W         5.10.74-yocto-standard #1
> Hardware name: SoCFPGA Stratix 10 SoCDK (DT)
> pstate: 00000005 (nzcv daif -PAN -UAO -TCO BTYPE=--)
> pc : clk_core_unprepare+0x114/0x274
> lr : clk_core_unprepare+0x114/0x274
> sp : ffff800011bdbb10
> clk_core_unprepare+0x114/0x274
>  clk_unprepare+0x38/0x50
>  stmmac_remove_config_dt+0x40/0x80
>  stmmac_pltfr_remove+0x64/0x80
>  platform_drv_remove+0x38/0x60
>  ... ..
>  el0_sync_handler+0x1a4/0x1b0
>  el0_sync+0x180/0x1c0
> This issue is introduced by introducing upstream commit 8f269102baf7
> ("net: stmmac: disable clocks in stmmac_remove_config_dt()")
> 
> But in latest mainline kernel, there is no this issue. Because commit
> 5ec55823438e("net: stmmac: add clocks management for gmac driver") and its
> folowing fixing commits improved clocks management for stmmac driver.
> Therefore, backport them to stable kernel v5.10.
> 

All now queued up, thanks.

greg k-h