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authorDan Carpenter <error27@gmail.com>2010-11-11 14:05:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-11-12 07:55:31 -0800
commit90482e45e4a39ee10b66436c2b3d5d4d88c2f73c (patch)
treeca1266c43d6df4e88d4303e87da55c238054cb97 /drivers/misc/isl29020.c
parent43b3a0c732776746f53d8ed2ba659583fc1692aa (diff)
downloadlinux-90482e45e4a39ee10b66436c2b3d5d4d88c2f73c.tar.bz2
misc/isl29020: signedness bug in als_sensing_range_store()
"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>
Diffstat (limited to 'drivers/misc/isl29020.c')
-rw-r--r--drivers/misc/isl29020.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/misc/isl29020.c b/drivers/misc/isl29020.c
index 34fe835921c4..ca47e6285075 100644
--- a/drivers/misc/isl29020.c
+++ b/drivers/misc/isl29020.c
@@ -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;