linux-kernel - Re: [PATCH v2 1/3] mtd: lpddr: Fix bad logic in print_drs

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Date:   Mon, 27 Apr 2020 22:08:34 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v2 1/3] mtd: lpddr: Fix bad logic in print_drs_error

Hi Gustavo,

"Gustavo A. R. Silva" <gustavo@...eddedor.com> wrote on Mon, 27 Apr
2020 14:50:37 -0500:

> Update logic for broken test. Use a more common logging style.
> 
> It appears the logic in this function is broken for the
> consecutive tests of
> 
>         if (prog_status & 0x3)
>                 ...
>         else if (prog_status & 0x2)
>                 ...
>         else (prog_status & 0x1)
>                 ...
> 
> Likely the first test should be
> 
>         if ((prog_status & 0x3) == 0x3)
> 
> Found by inspection of include files using printk.
> 
> Fixes: eb3db27507f7 ("[MTD] LPDDR PFOW definition")
> Cc: stable@...r.kernel.org
> Reported-by: Joe Perches <joe@...ches.com>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
> Changes in v2:
>  - None.
> 
>  include/linux/mtd/pfow.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/mtd/pfow.h b/include/linux/mtd/pfow.h
> index 122f3439e1af..c65d7a3be3c6 100644
> --- a/include/linux/mtd/pfow.h
> +++ b/include/linux/mtd/pfow.h
> @@ -128,7 +128,7 @@ static inline void print_drs_error(unsigned dsr)
>  
>  	if (!(dsr & DSR_AVAILABLE))
>  		printk(KERN_NOTICE"DSR.15: (0) Device not Available\n");
> -	if (prog_status & 0x03)
> +	if ((prog_status & 0x03) == 0x03)
>  		printk(KERN_NOTICE"DSR.9,8: (11) Attempt to program invalid "
>  						"half with 41h command\n");
>  	else if (prog_status & 0x02)


Acked-by: Miquel Raynal <miquel.raynal@...tlin.com>


Thanks,
Miquèl