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.

Signed-off-by: Colin Cross <ccross@android.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index ef0b2d7..273ec3a 100644 (file)
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/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);