From 265d426d7470d53e900379960eef5b4482125089 Mon Sep 17 00:00:00 2001 From: Benjamin Tissoires Date: Fri, 30 Sep 2016 16:42:19 -0700 Subject: [PATCH] Input: elan_i2c - fix return tests of i2c_smbus_read_block_data() i2c_smbus_read_block_data() returns negative errno else the number of data bytes in the slave's response. Checking for error not null means the function always fails if the device answers properly. So given that we read 3 bytes and access those, better check that we actually read those 3 bytes. Signed-off-by: Benjamin Tissoires Signed-off-by: Dmitry Torokhov --- drivers/input/mouse/elan_i2c_smbus.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/input/mouse/elan_i2c_smbus.c b/drivers/input/mouse/elan_i2c_smbus.c index cb6aecbc1dc2..e23b2495d52e 100644 --- a/drivers/input/mouse/elan_i2c_smbus.c +++ b/drivers/input/mouse/elan_i2c_smbus.c @@ -222,11 +222,13 @@ static int elan_smbus_get_checksum(struct i2c_client *client, static int elan_smbus_get_max(struct i2c_client *client, unsigned int *max_x, unsigned int *max_y) { + int ret; int error; u8 val[3]; - error = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val); - if (error) { + ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val); + if (ret != 3) { + error = ret < 0 ? ret : -EIO; dev_err(&client->dev, "failed to get dimensions: %d\n", error); return error; } @@ -240,12 +242,13 @@ static int elan_smbus_get_max(struct i2c_client *client, static int elan_smbus_get_resolution(struct i2c_client *client, u8 *hw_res_x, u8 *hw_res_y) { + int ret; int error; u8 val[3]; - error = i2c_smbus_read_block_data(client, - ETP_SMBUS_RESOLUTION_CMD, val); - if (error) { + ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RESOLUTION_CMD, val); + if (ret != 3) { + error = ret < 0 ? ret : -EIO; dev_err(&client->dev, "failed to get resolution: %d\n", error); return error; } @@ -260,12 +263,13 @@ static int elan_smbus_get_num_traces(struct i2c_client *client, unsigned int *x_traces, unsigned int *y_traces) { + int ret; int error; u8 val[3]; - error = i2c_smbus_read_block_data(client, - ETP_SMBUS_XY_TRACENUM_CMD, val); - if (error) { + ret = i2c_smbus_read_block_data(client, ETP_SMBUS_XY_TRACENUM_CMD, val); + if (ret != 3) { + error = ret < 0 ? ret : -EIO; dev_err(&client->dev, "failed to get trace info: %d\n", error); return error; }