linux-kernel - Re: ADT746X: logical-bitwise & confusion in set_max_duty_at

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Date:	Mon, 10 Mar 2008 22:56:00 +0100
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Roel Kluin <12o3l@...cali.nl>
Cc:	akpm@...ux-foundation.org, "Darrick J. Wong" <djwong@...ibm.com>,
	benh@...nel.crashing.org, linuxppc-dev@...abs.org,
	lkml <linux-kernel@...r.kernel.org>,
	Colin Leroy <colin@...ino.net>
Subject: Re: ADT746X: logical-bitwise & confusion in set_max_duty_at_crit()

> It includes suggested changes by Segher Boessenkool and I think this
> version was tested by Darrick J. Wong

> -	u8 reg;
> +	u8 reg, temp;
>  	struct i2c_client *client = to_i2c_client(dev);
>  	struct adt7473_data *data = i2c_get_clientdata(client);
> -	int temp = simple_strtol(buf, NULL, 10);
> -	temp = temp && 0xFF;
> +
> +	temp = simple_strtol(buf, NULL, 10) & 0xFF;

It still does this superfluous "& 0xff", which hides the lack of
range checking.


Segher

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