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authorAxel Lin <axel.lin@gmail.com>2011-03-23 02:34:00 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-23 03:44:10 +0300
commit6f7d485e13c6c07348cf9cfd1b735fe1bcf3caa9 (patch)
treee29567aa27363fc8072a355d89d951ef95c41920 /drivers/misc/hmc6352.c
parent4e6735992392ecd393674119aef9ec7bff9be5b0 (diff)
downloadlinux-6f7d485e13c6c07348cf9cfd1b735fe1bcf3caa9.tar.xz
drivers/misc/hmc6352.c: fix wrong return value checking for i2c_master_recv()
i2c_master_recv() returns negative errno, or else the number of bytes read. Thus i2c_master_recv(client, i2c_data, 2) returns 2 instead of 1 in success case. [akpm@linux-foundation.org: make `ret' signed] Signed-off-by: Axel Lin <axel.lin@gmail.com> Cc: Kalhan Trisal <kalhan.trisal@intel.com> Cc: 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/hmc6352.c')
-rw-r--r--drivers/misc/hmc6352.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/misc/hmc6352.c b/drivers/misc/hmc6352.c
index 234bfcaf2099..ca938fc8a8d6 100644
--- a/drivers/misc/hmc6352.c
+++ b/drivers/misc/hmc6352.c
@@ -75,7 +75,7 @@ static ssize_t compass_heading_data_show(struct device *dev,
{
struct i2c_client *client = to_i2c_client(dev);
unsigned char i2c_data[2];
- unsigned int ret;
+ int ret;
mutex_lock(&compass_mutex);
ret = compass_command(client, 'A');
@@ -86,7 +86,7 @@ static ssize_t compass_heading_data_show(struct device *dev,
msleep(10); /* sending 'A' cmd we need to wait for 7-10 millisecs */
ret = i2c_master_recv(client, i2c_data, 2);
mutex_unlock(&compass_mutex);
- if (ret != 1) {
+ if (ret < 0) {
dev_warn(dev, "i2c read data cmd failed\n");
return ret;
}