netdev - Re: [PATCH] net: stmmac: dwmac-rk: fix unbalanced pm_runtime

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Message-ID: <YS0v9UbzoHkiU9om@sashalap>
Date:   Mon, 30 Aug 2021 15:22:29 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Michael Riesch <michael.riesch@...fvision.net>
Cc:     wens@...nel.org, netdev <netdev@...r.kernel.org>,
        "moderated list:ARM/STM32 ARCHITECTURE" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
Subject: Re: [PATCH] net: stmmac: dwmac-rk: fix unbalanced pm_runtime_enable
 warnings

On Mon, Aug 30, 2021 at 09:57:51AM +0200, Michael Riesch wrote:
>Hi ChenYu,
>
>On 8/29/21 7:48 PM, Chen-Yu Tsai wrote:
>> Hi,
>>
>> On Mon, Aug 23, 2021 at 10:39 PM Michael Riesch
>> <michael.riesch@...fvision.net> wrote:
>>>
>>> This reverts commit 2c896fb02e7f65299646f295a007bda043e0f382
>>> "net: stmmac: dwmac-rk: add pd_gmac support for rk3399" and fixes
>>> unbalanced pm_runtime_enable warnings.
>>>
>>> In the commit to be reverted, support for power management was
>>> introduced to the Rockchip glue code. Later, power management support
>>> was introduced to the stmmac core code, resulting in multiple
>>> invocations of pm_runtime_{enable,disable,get_sync,put_sync}.
>>>
>>> The multiple invocations happen in rk_gmac_powerup and
>>> stmmac_{dvr_probe, resume} as well as in rk_gmac_powerdown and
>>> stmmac_{dvr_remove, suspend}, respectively, which are always called
>>> in conjunction.
>>>
>>> Signed-off-by: Michael Riesch <michael.riesch@...fvision.net>
>>
>> I just found that Ethernet stopped working on my RK3399 devices,
>> and I bisected it down to this patch.
>
>Oh dear. First patch in a kernel release for a while and I already break
>things.
>
>Cc: Sasha as this patch has just been applied to 5.13-stable.

I'll drop it for now, thanks for letting me know!

-- 
Thanks,
Sasha