greybus: pm: add error handling to bundle activation

The firmware now keeps the underlying hardware disabled until
receiving the first Bundle Activate request. Additionally: requesting
transition to a state the bundle is already in is no longer an error.

We can now add proper error handling to the bundle activate call.

Signed-off-by: Bartosz Golaszewski <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/greybus/core.c

···
 		return retval;
 	}
 
-	/*
-	 * FIXME: We need to perform error handling on bundle activate call
-	 * below when firmware is ready. We just allow the activate operation to
-	 * fail for now since bundle may be in active already.
-	 */
-	gb_control_bundle_activate(bundle->intf->control, bundle->id);
+	retval = gb_control_bundle_activate(bundle->intf->control, bundle->id);
+	if (retval) {
+		pm_runtime_put(&bundle->intf->dev);
+		return retval;
+	}
 
 	/*
 	 * Unbound bundle devices are always deactivated. During probe, the