hwmon: (core) Avoid cyclic dependency between hwmon and thermal_sys
If both hwmon and thermal_sys are built as modules, and
CONFIG_THERMAL_HWMON is enabled, the following cyclic module dependency
is reported.
depmod: ERROR: Found 2 modules in dependency cycles!
depmod: ERROR: Cycle detected: hwmon -> thermal_sys -> hwmon
Fixes: e4bce763adb2 ("hwmon: (core) New hwmon registration API")
Reported-by: Vignesh R <vigneshr@ti.com>
Cc: Keerthy J <j-keerthy@ti.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index fade170..adae684 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -108,7 +108,13 @@
/* Thermal zone handling */
-#if IS_REACHABLE(CONFIG_THERMAL) && defined(CONFIG_THERMAL_OF)
+/*
+ * The complex conditional is necessary to avoid a cyclic dependency
+ * between hwmon and thermal_sys modules.
+ */
+#if IS_REACHABLE(CONFIG_THERMAL) && defined(CONFIG_THERMAL_OF) && \
+ (!defined(CONFIG_THERMAL_HWMON) || \
+ !(defined(MODULE) && IS_MODULE(CONFIG_THERMAL)))
static int hwmon_thermal_get_temp(void *data, int *temp)
{
struct hwmon_thermal_data *tdata = data;
@@ -153,7 +159,7 @@
{
return 0;
}
-#endif /* IS_REACHABLE(CONFIG_THERMAL) && defined(CONFIG_THERMAL_OF) */
+#endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
/* sysfs attribute management */