linux-kernel - Re: [PATCH] mtd: spi-nor: core: correct type of i to be signed

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Message-Id: <CZII7JH72OWF.1IAQO5VJCBZX3@kernel.org>
Date: Fri, 01 Mar 2024 16:04:01 +0100
From: "Michael Walle" <mwalle@...nel.org>
To: "Muhammad Usama Anjum" <usama.anjum@...labora.com>, "Tudor Ambarus"
 <tudor.ambarus@...aro.org>, "Pratyush Yadav" <pratyush@...nel.org>, "Miquel
 Raynal" <miquel.raynal@...tlin.com>, "Richard Weinberger" <richard@....at>,
 "Vignesh Raghavendra" <vigneshr@...com>, "Takahiro Kuwano"
 <Takahiro.Kuwano@...ineon.com>
Cc: <kernel@...labora.com>, <kernel-janitors@...r.kernel.org>,
 <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: spi-nor: core: correct type of i to be signed

Hi,

On Fri Mar 1, 2024 at 3:45 PM CET, Muhammad Usama Anjum wrote:
> The i should be signed to find out the end of the loop. Otherwise,
> i >= 0 is always true and loop becomes infinite.
>
> Fixes: 6a9eda34418f ("mtd: spi-nor: core: set mtd->eraseregions for non-uniform erase map")
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
>  drivers/mtd/spi-nor/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index 65b32ea59afc6..46bc45b80883f 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -3373,7 +3373,7 @@ static u32
>  spi_nor_get_region_erasesize(const struct spi_nor_erase_region *region,
>  			     const struct spi_nor_erase_type *erase_type)
>  {
> -	u8 i;
> +	s8 i;

Can we just have an "int" here. So we don't shoot ourselves in the
foot again. I'm really no friend of these kind of micro
optimizations, it should have been int in the first place IMHO.

-michael

>  
>  	if (region->overlaid)
>  		return region->size;


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