linux-kernel - Re: [PATCH V4 net-bugfixs] net/ethernet: Update ret when ptp

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Message-ID: <20201112181426.GC21010@hoboy.vegasvil.org>
Date:   Thu, 12 Nov 2020 10:14:26 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        王擎 <wangqing@...o.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Samuel Zou <zou_wei@...wei.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Networking <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4 net-bugfixs] net/ethernet: Update ret when ptp_clock
 is ERROR

On Thu, Nov 12, 2020 at 12:05:25PM +0200, Grygorii Strashko wrote:
> But, as Richard mentioned [1], ptp_clock_register() may return NULL even if PTP_1588_CLOCK=y
> (which I can't confirm neither deny - from the fast look at ptp_clock_register()
>  code it seems should not return NULL)

This whole "implies" thing turned out to be a colossal PITA.

I regret the fact that it got merged.  It wasn't my idea.

I will push back on playing games with the Kconfig settings.  Even if
that happens to work for your particular driver, still the call site
of ptp_clock_register() must follow the correct pattern.

Why?  Because others will copy/paste it.

Thanks,
Richard