V4L/DVB (6465): Use correct error codes when chip is not recognized

If the chip isn't recognized, then the correct errors should be returned.
The v4l2_i2c_attach() utility function will return 0 for all errors
except -ENOMEM to provide proper compatibility support for the old I2C
probing function.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/media/video/wm8739.c b/drivers/media/video/wm8739.c
index 459228a5cf50..3d9e709833c5 100644
--- a/drivers/media/video/wm8739.c
+++ b/drivers/media/video/wm8739.c
@@ -264,6 +264,10 @@ static int wm8739_probe(struct i2c_client *client)
 {
         struct wm8739_state *state;
 
+        /* Check if the adapter supports the needed features */
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                return -EIO;
+
         v4l_info(client, "chip found @ 0x%x (%s)\n", client->addr << 1, client->adapter->name);
 
         state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);