Commit 6f7d485e authored Mar 22, 2011 by Axel Lin Committed by Linus Torvalds Mar 22, 2011

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>

parent 4e673599

drivers/misc/hmc6352.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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;
		}