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misc/isl29020: signedness bug in als_sensing_range_store()

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"ret_val" is supposed to be signed here or the error handling breaks.
Also we should check the return value from i2c_smbus_read_byte_data().

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Carpenter 2010-11-11 14:05:11 -08:00 committed by Linus Torvalds
parent 43b3a0c732
commit 90482e45e4
1 changed files with 3 additions and 1 deletions
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4
drivers/misc/isl29020.c
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@ -87,7 +87,7 @@ static ssize_t als_sensing_range_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
unsigned int ret_val;
int ret_val;
unsigned long val;
if (strict_strtoul(buf, 10, &val))
@ -106,6 +106,8 @@ static ssize_t als_sensing_range_store(struct device *dev,
val = 4;
ret_val = i2c_smbus_read_byte_data(client, 0x00);
if (ret_val < 0)
return ret_val;
ret_val &= 0xFC; /*reset the bit before setting them */
ret_val |= val - 1;