linux-kernel - Re: [PATCH 02/13] net: ravb: Use pm_runtime_resume_and

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Message-ID: <33a44057-eefa-44ba-8e06-b6eb8bd79e59@tuxon.dev>
Date:   Tue, 21 Nov 2023 07:57:54 +0200
From:   claudiu beznea <claudiu.beznea@...on.dev>
To:     Sergey Shtylyov <s.shtylyov@....ru>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        p.zabel@...gutronix.de, yoshihiro.shimoda.uh@...esas.com,
        geert+renesas@...der.be, wsa+renesas@...g-engineering.com,
        biju.das.jz@...renesas.com,
        prabhakar.mahadev-lad.rj@...renesas.com,
        sergei.shtylyov@...entembedded.com,
        mitsuhiro.kimura.kc@...esas.com, masaru.nagai.vx@...esas.com
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 02/13] net: ravb: Use pm_runtime_resume_and_get()



On 20.11.2023 21:23, Sergey Shtylyov wrote:
> On 11/20/23 11:45 AM, Claudiu wrote:
> 
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> pm_runtime_get_sync() may return with error. In case it returns with error
>> dev->power.usage_count needs to be decremented. pm_runtime_resume_and_get()
>> takes care of this. Thus use it.
>>
>> Along with this pm_runtime_resume_and_get() and reset_control_deassert()
>> were moved before alloc_etherdev_mqs() to simplify the error path.
> 
>    I don't see how it simplifies the error path...

By not changing it... Actually, I took the other approach: you suggested in
patch 1 to re-arrange the error path, I did it the other way around:
changed the initialization path...

>    Re-ordering the statements at the end of the error path seems cheaper than
> what you do.
> 
>> Also, in case pm_runtime_resume_and_get() returns error the reset signal
>> is deasserted and runtime PM is disabled (by jumping to the proper
>> error handling label).
>>
>> Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> [...]
> 
> MBR, Sergey