linux-kernel - Re: [RFC PATCH 2/2] i2c: octeon: check correct size of maximum RECV

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Message-ID: <20200724194518.GE1227@ninjato>
Date:   Fri, 24 Jul 2020 21:45:18 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     linux-i2c@...r.kernel.org, Robert Richter <rrichter@...vell.com>
Cc:     linux-renesas-soc@...r.kernel.org,
        David Daney <david.daney@...ium.com>,
        Jan Glauber <jan.glauber@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] i2c: octeon: check correct size of maximum
 RECV_LEN packet

On Sun, Jun 28, 2020 at 01:52:45PM +0200, Wolfram Sang wrote:
> I2C_SMBUS_BLOCK_MAX defines already the maximum number as defined in the
> SMBus 2.0 specs. I don't see a reason to add 1 here.
> 
> Fixes: 886f6f8337dd ("i2c: octeon: Support I2C_M_RECV_LEN")
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> ---

Robert, is this correct?

> 
> Only build tested, I don't have the HW. Please let me know if I
> overlooked something, but to the best of my knowledge, this +1 is wrong.
> 
>  drivers/i2c/busses/i2c-octeon-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-octeon-core.c b/drivers/i2c/busses/i2c-octeon-core.c
> index d9607905dc2f..845eda70b8ca 100644
> --- a/drivers/i2c/busses/i2c-octeon-core.c
> +++ b/drivers/i2c/busses/i2c-octeon-core.c
> @@ -347,7 +347,7 @@ static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
>  		if (result)
>  			return result;
>  		if (recv_len && i == 0) {
> -			if (data[i] > I2C_SMBUS_BLOCK_MAX + 1)
> +			if (data[i] > I2C_SMBUS_BLOCK_MAX)
>  				return -EPROTO;
>  			length += data[i];
>  		}
> -- 
> 2.20.1
> 

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