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

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Date:   Thu, 12 Nov 2020 22:21:21 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     王擎 <wangqing@...o.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "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: Re: [PATCH V4 net-bugfixs] net/ethernet: Update ret when
 ptp_clock is ERROR

On Thu, Nov 12, 2020 at 7:19 PM Richard Cochran
<richardcochran@...il.com> wrote:
>
> On Thu, Nov 12, 2020 at 09:25:12AM +0100, Arnd Bergmann wrote:
> > This is not really getting any better. If Richard is worried about
> > Kconfig getting changed here, I would suggest handling the
> > case of PTP being disabled by returning an error early on in the
> > function, like
> >
> > struct am65_cpts *am65_cpts_create(struct device *dev, void __iomem *regs,
> >                                    struct device_node *node)
> > {
> >         struct am65_cpts *cpts;
> >         int ret, i;
> >
> >         if (!IS_ENABLED(CONFIG_PTP_1588_CLOCK))
> >                  return -ENODEV;
>
> No, please, no.  That only adds confusion.  The NULL return value
> already signals that the compile time support was missing.  That was
> the entire point of this...
>
>  * ptp_clock_register() - register a PTP hardware clock driver
>  *
>  * @info:   Structure describing the new clock.
>  * @parent: Pointer to the parent device of the new clock.
>  *
>  * Returns a valid pointer on success or PTR_ERR on failure.  If PHC
>  * support is missing at the configuration level, this function
>  * returns NULL, and drivers are expected to gracefully handle that
>  * case separately.

The problem is that the caller doesn't handle that case gracefully,
but it instead wants to return an error after all. I don't see a good
solution either; as far as I'm concerned we should never be building
code that fails if PTP_1588_CLOCK is disabled when it cannot
do anything sensible in that configuration.

I agree that the 'imply' keyword in Kconfig is what made this a
lot worse, and it would be best to replace that with normal
dependencies.

It would be possible to have a ptp_clock_register_optional()
interface in addition to ptp_clock_register(), which could then
be changed to return an error. Some other subsystems follow
this pattern, but it's not any less confusing either.

     Arnd