netdev - Re: [PATCH v2] drivers: net: xgene: Remove acpi_has

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Date:   Tue, 23 Jul 2019 17:17:17 -0600
From:   Kelsey Skunberg <skunberg.kelsey@...il.com>
To:     bjorn@...gaas.com
Cc:     iyappan@...amperecomputing.com, keyur@...amperecomputing.com,
        quan@...amperecomputing.com, David Miller <davem@...emloft.net>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH v2] drivers: net: xgene: Remove acpi_has_method() calls

On Tue, Jul 23, 2019 at 05:56:04PM -0500, Bjorn Helgaas wrote:
> On Tue, Jul 23, 2019 at 1:59 PM Kelsey Skunberg
> <skunberg.kelsey@...il.com> wrote:
> >
> > acpi_evaluate_object will already return an error if the needed method
> > does not exist. Remove unnecessary acpi_has_method() calls and check the
> > returned acpi_status for failure instead.
> 
> > diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c b/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c
> > index 6453fc2ebb1f..5d637b46b2bf 100644
> > --- a/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c
> > +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c
> > @@ -437,6 +437,7 @@ static void xgene_sgmac_tx_disable(struct xgene_enet_pdata *p)
> >  static int xgene_enet_reset(struct xgene_enet_pdata *p)
> >  {
> >         struct device *dev = &p->pdev->dev;
> > +       acpi_status status;
> >
> >         if (!xgene_ring_mgr_init(p))
> >                 return -ENODEV;
> > @@ -460,14 +461,13 @@ static int xgene_enet_reset(struct xgene_enet_pdata *p)
> >                 }
> >         } else {
> >  #ifdef CONFIG_ACPI
> > -               if (acpi_has_method(ACPI_HANDLE(&p->pdev->dev), "_RST"))
> > -                       acpi_evaluate_object(ACPI_HANDLE(&p->pdev->dev),
> > -                                            "_RST", NULL, NULL);
> > -               else if (acpi_has_method(ACPI_HANDLE(&p->pdev->dev), "_INI"))
> > +               status = acpi_evaluate_object(ACPI_HANDLE(&p->pdev->dev),
> > +                                             "_RST", NULL, NULL);
> > +               if (ACPI_FAILURE(status)) {
> >                         acpi_evaluate_object(ACPI_HANDLE(&p->pdev->dev),
> >                                              "_INI", NULL, NULL);
> > +               }
> >  #endif
> > -       }
> 
> Oops, I don't think you intended to remove that brace.
> 
> If you haven't found it already, CONFIG_COMPILE_TEST is useful for
> building things that wouldn't normally be buildable on your arch.

Thank you very much for catching that. I did not know about
CONFIG_COMPILE_TEST yet and that will be very useful. It's clear why my
build test wasn't coming up with the same errors now. I know for future
patches now and will certainly get this one fixed.
Thank you again.

-Kelsey