linux-kernel - Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories

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Date:   Mon, 22 Oct 2018 11:15:43 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        "richard@....at" <richard@....at>, Mark Brown <broonie@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "cyrille.pitchen@...rochip.com" <cyrille.pitchen@...rochip.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "Cristian.Birsan@...rochip.com" <Cristian.Birsan@...rochip.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP
 SPI NOR flash memories

On Mon, 22 Oct 2018 06:04:13 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:


> -       /* Find the matching configuration map */
> -       while (SMPT_MAP_ID(smpt[i]) != map_id) {
> -               if (smpt[i] & SMPT_DESC_END)
> -                       goto out;
> +       if (map_id_is_valid)
> +               pr_info("%s:%i map_id=%d\n", __func__, __LINE__, map_id);
> +       else
> +               pr_info("%s:%i NO map_id\n", __func__, __LINE__);
> +
> +       for (nmaps = 0; nmaps< smpt_len; nmaps++) {

Why did you change this for loop?

> +               if(!(smpt[nmaps] & SMPT_DESC_TYPE_MAP))
> +                       continue;
> +
> +               if(!map_id_is_valid) {
> +                       if (nmaps) {

With your change in the for () block, this test is no longer valid...

Please keep the original patch and patch the if () condition as
suggested.

> +                               ret = NULL;
> +                               break;
> +                       }
> +
> +                       ret = smpt+nmaps;
> +               } else if (map_id == SMPT_MAP_ID(smpt[nmaps])) {
> +                       ret = smpt+nmaps;
> +                       break;
> +               }
> +
>                 /* increment the table index to the next map */
> -               i += SMPT_MAP_REGION_COUNT(smpt[i]) + 1;
> +               nmaps += SMPT_MAP_REGION_COUNT(smpt[nmaps]) + 1;
>         }
> 
> -       ret = smpt + i;
>         /* fall through */
>  out:
>         nor->addr_width = addr_width;