i2c: Check for address business before creating clients

We check for address business in i2c_probe_address(),
i2c_detect_address() and i2c_new_probed_device(), but this isn't
sufficient. Drivers can call i2c_attach_client() and
i2c_new_device() on any address, so we must check the address there
as well.

This fixes bug #11239:
http://bugzilla.kernel.org/show_bug.cgi?id=11239

Signed-off-by: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index c16dcad94412c438998ad9e2014061a7546931cb..550853f79ae81dbba8399747423d87eb40bdd59d 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -813,7 +813,12 @@ static int i2c_check_addr(struct i2c_adapter *adapter, int addr)
 int i2c_attach_client(struct i2c_client *client)
 {
        struct i2c_adapter *adapter = client->adapter;
-       int res = 0;
+       int res;
+
+       /* Check for address business */
+       res = i2c_check_addr(adapter, client->addr);
+       if (res)
+               return res;
 
        client->dev.parent = &client->adapter->dev;
        client->dev.bus = &i2c_bus_type;