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

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Date:   Wed, 25 Aug 2021 10:07:48 +0200
From:   Michael Riesch <michael.riesch@...fvision.net>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, 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>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
Subject: Re: [PATCH] net: stmmac: dwmac-rk: fix unbalanced pm_runtime_enable
 warnings

Hi Jakub,

On 8/23/21 6:44 PM, Jakub Kicinski wrote:
> On Mon, 23 Aug 2021 16:37:54 +0200 Michael Riesch wrote:
>> 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}.
> 
> Can we get a Fixes tag? I.e. reference to the earliest commit where 
> the warning can be triggered?

Of course :-)

Fixes: 5ec55823438e850c91c6b92aec93fb04ebde29e2 ("net: stmmac: add
clocks management for gmac driver")

This commit introduces power management support to the stmmac core
(stmmac_{dvr_probe, dvr_remove, suspend, resume}).

Best regards,
Michael

>> 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.