ion: don't use id 0 for handle cookie

ion userspace clients think that the cookie is a pointer, so they
use NULL to check if the handle has been initialized.  Set the first
id number to 1.

Change-Id: Ifb9af6029a8b08f57e41bc6160cc11e11001a2a9
Signed-off-by: Colin Cross <ccross@android.com>

diff --git a/drivers/gpu/ion/ion.c b/drivers/gpu/ion/ion.c
index 9f73052c39209f35efc92de8f198b64e7c01f4ac..1d4c8876ab5cc761e4d31b72cf9774ec0a53b739 100644 (file)
--- a/drivers/gpu/ion/ion.c
+++ b/drivers/gpu/ion/ion.c
@@ -424,7 +424,7 @@ static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
                rc = idr_pre_get(&client->idr, GFP_KERNEL);
                if (!rc)
                        return -ENOMEM;
-               rc = idr_get_new(&client->idr, handle, &id);
+               rc = idr_get_new_above(&client->idr, handle, 1, &id);
                handle->id = id;
        } while (rc == -EAGAIN);