linux-kernel - Re: [PATCH v3 01/10] ata: pata_platform: Make use of platform_get_mem_or

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Message-ID: <CA+V-a8tXgWAV2v2-DJh7TMzmNp0W-33=OJf1PTC5KDqZODtLdw@mail.gmail.com>
Date:   Fri, 24 Dec 2021 18:01:33 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Sergey Shtylyov <s.shtylyov@....ru>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Rob Herring <robh+dt@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>
Subject: Re: [PATCH v3 01/10] ata: pata_platform: Make use of platform_get_mem_or_io()

Hi Sergey,

Thank you for the review.

On Fri, Dec 24, 2021 at 5:56 PM Sergey Shtylyov <s.shtylyov@....ru> wrote:
>
> On 12/24/21 4:12 PM, 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>
> > Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>
> > ---
> >  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))
>
>    You don't have to keep unlikely() here -- the first *if* doesn't have it anyway,
> only the 2nd one does...
>
Agreed the first if doesn't have it, ie unlikely() will only be hit
when resource 0 isn't mem/IO, So with my patch introduced if mem/io is
NULL  unlikely() will be called. So there is "NO" behavioral change.

> > +             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))
>
>    Ditto.
>
Ditto.

Cheers,
Prabhakar