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Message-ID: <47D5B2E9.2030509@tiscali.nl>
Date: Mon, 10 Mar 2008 23:15:05 +0100
From: Roel Kluin <12o3l@...cali.nl>
To: Segher Boessenkool <segher@...nel.crashing.org>
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()
Segher Boessenkool wrote:
>> 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.
Sorry didn't quite grep that
---
logical-bitwise & confusion
Signed-off-by: Roel Kluin <12o3l@...cali.nl>
---
diff --git a/drivers/hwmon/adt7473.c b/drivers/hwmon/adt7473.c
index 9587869..98937d3 100644
--- a/drivers/hwmon/adt7473.c
+++ b/drivers/hwmon/adt7473.c
@@ -566,11 +566,11 @@ static ssize_t set_max_duty_at_crit(struct device *dev,
const char *buf,
size_t count)
{
- 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);
mutex_lock(&data->lock);
data->max_duty_at_overheat = temp;
--
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