linux-kernel - Re: [PATCH 1/2] mtd: concat: refactor concat_lock/concat

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Message-ID: <CAFLxGvzvAdhmNOaNmPCRXUR9GGgaQ1n2HuRLLCb4Nj-tUrm5yQ@mail.gmail.com>
Date:   Wed, 22 May 2019 22:30:08 +0200
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mtd: concat: refactor concat_lock/concat_unlock

On Wed, May 22, 2019 at 2:08 AM Chris Packham
<chris.packham@...iedtelesis.co.nz> wrote:
>
> concat_lock() and concat_unlock() only differed in terms of the mtd_xx
> operation they called. Refactor them to use a common helper function and
> pass mtd_lock or mtd_unlock as an argument.
>
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
>  drivers/mtd/mtdconcat.c | 41 +++++++++--------------------------------
>  1 file changed, 9 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
> index cbc5925e6440..9514cd2db63c 100644
> --- a/drivers/mtd/mtdconcat.c
> +++ b/drivers/mtd/mtdconcat.c
> @@ -451,7 +451,8 @@ static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
>         return err;
>  }
>
> -static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
> +static int __concat_xxlock(struct mtd_info *mtd, loff_t ofs, uint64_t len,
> +                          int (*mtd_op)(struct mtd_info *mtd, loff_t ofs, uint64_t len))
>  {
>         struct mtd_concat *concat = CONCAT(mtd);
>         int i, err = -EINVAL;
> @@ -470,7 +471,7 @@ static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
>                 else
>                         size = len;
>
> -               err = mtd_lock(subdev, ofs, size);
> +               err = mtd_op(subdev, ofs, size);
>                 if (err)
>                         break;
>
> @@ -485,38 +486,14 @@ static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
>         return err;
>  }
>
> -static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
> +static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
>  {
> -       struct mtd_concat *concat = CONCAT(mtd);
> -       int i, err = 0;
> -
> -       for (i = 0; i < concat->num_subdev; i++) {
> -               struct mtd_info *subdev = concat->subdev[i];
> -               uint64_t size;
> -
> -               if (ofs >= subdev->size) {
> -                       size = 0;
> -                       ofs -= subdev->size;
> -                       continue;
> -               }
> -               if (ofs + len > subdev->size)
> -                       size = subdev->size - ofs;
> -               else
> -                       size = len;
> -
> -               err = mtd_unlock(subdev, ofs, size);
> -               if (err)
> -                       break;
> -
> -               len -= size;
> -               if (len == 0)
> -                       break;
> -
> -               err = -EINVAL;
> -               ofs = 0;
> -       }
> +       return __concat_xxlock(mtd, ofs, len, mtd_lock);
> +}
>
> -       return err;
> +static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
> +{
> +       return __concat_xxlock(mtd, ofs, len, mtd_unlock);
>  }
>
>  static void concat_sync(struct mtd_info *mtd)

Not sure if it passing a function pointer is worth it. bool is_lock would
also do it. But this is a matter of taste, I guess. :)

Reviewed-by: Richard Weinberger <richard@....at>

-- 
Thanks,
//richard