[PATCH 4/5] thermal/core: Enforce paired .bind/.unbind callbacks

[Zhang Rui]

The .bind/.unbind callbacks are designed to allow the thermal zone
device to bind to/unbind from a matched cooling device, with thermal
instances created/deleted.

In this sense, .bind/.unbind callbacks must exist in pairs.

Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
 drivers/thermal/thermal_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 5225d65fb0e0..9c447f22cb39 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1258,6 +1258,11 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
 	if (num_trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp) && !trips)
 		return ERR_PTR(-EINVAL);
 
+	if ((ops->bind && !ops->unbind) || (!ops->bind && ops->unbind)) {
+		pr_err("Thermal zone device .bind/.unbind not paired\n");
+		return ERR_PTR(-EINVAL);
+	}
+
 	if (!thermal_class)
 		return ERR_PTR(-ENODEV);
 
-- 
2.25.1