linux-kernel - Re: s3c24xx nand: add command line partition table parsing support (resend)

Open Source and information security mailing list archives

Date:	Thu, 18 Sep 2008 23:55:48 +0800
From:	"Conke Hu" <conke.hu@...il.com>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>
Cc:	Linux-arm-kernel@...ts.arm.linux.org.uk,
	"Ben Dooks" <ben-linux@...ff.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: s3c24xx nand: add command line partition table parsing support (resend)

Thanks! I'd re-write and resend the patch

On 9/18/08, Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> On Thu, Sep 18, 2008 at 09:13:01AM +0800, Conke Hu wrote:
> > @@ -875,7 +890,7 @@ static int s3c24xx_nand_probe(struct platform_device *pdev,
> >
> >       /* allocate our information */
> >
> > -       size = nr_sets * sizeof(*info->mtds);
> > +       size = nr_sets * (sizeof(*info->mtds) + S3C_NAND_NAME_LEN);
>
> Why not make the 'name' part of struct s3c2410_nand_mtd?  IOW:
>
>  struct s3c2410_nand_mtd {
>        struct mtd_info                 mtd;
>        struct nand_chip                chip;
>        struct s3c2410_nand_set         *set;
>        struct s3c2410_nand_info        *info;
>        int                             scan_res;
> +       char                            name[S3C_NAND_NAME_LEN];
>  };
>
> That way you can avoid...
>
> >       info->mtds = kmalloc(size, GFP_KERNEL);
> >       if (info->mtds == NULL) {
> >               dev_err(&pdev->dev, "failed to allocate mtd storage\n");
> > @@ -888,10 +903,15 @@ static int s3c24xx_nand_probe(struct
> > platform_device *pdev,
> >       /* initialise all possible chips */
> >
> >       nmtd = info->mtds;
> > +       name = (char *)(info->mtds + nr_sets);
>
> This pointer arithmetic.
>
> >
> >       for (setno = 0; setno < nr_sets; setno++, nmtd++) {
> >               pr_debug("initialising set %d (%p, info %p)\n", setno,
> > nmtd, info);
> >
> > +               sprintf(name, "s3c_nand%d", setno);
> > +               nmtd->mtd.name = name;
> > +               name += S3C_NAND_NAME_LEN;
> > +
>
> And this can become the more safe:
>
>                snprintf(nmtd->name, sizeof(nmtd->name), "s3c_nand%d", setno);
>                nmtd->mtd.name = nmtd->name;
>
> >               s3c2410_nand_init_chip(info, nmtd, sets);
> >
> >               nmtd->scan_res = nand_scan_ident(&nmtd->mtd,
> >
> > -------------------------------------------------------------------
> > List admin: http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm-kernel
> > FAQ:        http://www.arm.linux.org.uk/mailinglists/faq.php
> > Etiquette:  http://www.arm.linux.org.uk/mailinglists/etiquette.php
>
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