From 611884ccc6286b61032d2790050f8e840fb61b33 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Fri, 19 Dec 2014 12:57:49 -0800 Subject: [PATCH] Input: elan_i2c - check if device is there before really probing Before trying to properly initialize the touchpad and generate bunch of errors, let's first see it there is anything at the given address. If we get error, fail silently with -ENXIO. Reviewed-by: Guenter Roeck Signed-off-by: Dmitry Torokhov --- drivers/input/mouse/elan_i2c_core.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c index d5ab9ddef3e37..551ad2934fa7b 100644 --- a/drivers/input/mouse/elan_i2c_core.c +++ b/drivers/input/mouse/elan_i2c_core.c @@ -1077,6 +1077,13 @@ static int elan_probe(struct i2c_client *client, return error; } + /* Make sure there is something at this address */ + error = i2c_smbus_read_byte(client); + if (error < 0) { + dev_dbg(&client->dev, "nothing at this address: %d\n", error); + return -ENXIO; + } + /* Initialize the touchpad. */ error = elan_initialize(data); if (error) -- 2.39.5