linux-kernel - Re: [PATCH v2 1/4] ata: pata_platform: make use of platform_get_mem_or

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Date:   Thu, 23 Dec 2021 11:25:08 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] ata: pata_platform: make use of platform_get_mem_or_io()

Hi Damien,

Thank you for the review.

On Thu, Dec 23, 2021 at 12:35 AM Damien Le Moal
<damien.lemoal@...nsource.wdc.com> wrote:
>
> On 12/22/21 01:26, Lad Prabhakar wrote:
> > Make use of platform_get_mem_or_io() to simplify the code.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > v1-->v2
> > * No change
> > ---
> >  drivers/ata/pata_platform.c | 18 ++++++------------
> >  1 file changed, 6 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c
> > index 028329428b75..cb3134bf88eb 100644
> > --- a/drivers/ata/pata_platform.c
> > +++ b/drivers/ata/pata_platform.c
> > @@ -198,22 +198,16 @@ static int pata_platform_probe(struct platform_device *pdev)
> >       /*
> >        * Get the I/O base first
> >        */
> > -     io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
> > -     if (io_res == NULL) {
> > -             io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > -             if (unlikely(io_res == NULL))
> > -                     return -EINVAL;
> > -     }
> > +     io_res = platform_get_mem_or_io(pdev, 0);
> > +     if (unlikely(!io_res))
>
> This is not the hot path, so I do not think that the unlikely() is
> necessary here.
>
Ok will drop the unlikely() and just check for NULL instead.

> > +             return -EINVAL;
> >
> >       /*
> >        * Then the CTL base
> >        */
> > -     ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
> > -     if (ctl_res == NULL) {
> > -             ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> > -             if (unlikely(ctl_res == NULL))
> > -                     return -EINVAL;
> > -     }
> > +     ctl_res = platform_get_mem_or_io(pdev, 1);
> > +     if (unlikely(!ctl_res))
>
> Same comment here.
>
ditto.

Cheers,
Prabhakar

> > +             return -EINVAL;
> >
> >       /*
> >        * And the IRQ
>
>
> --
> Damien Le Moal
> Western Digital Research