regulator: Check status before disabling

When disabling regulator when they are unused, check before is they are
enabled.
While here don't check the enable_cnt on the regulator entry as it is
checked by regnode_stop.
This solve the panic on any board using a fixed regulator that is driven
by a gpio when the regulator is unused.

Tested On: OrangePi One
Pointy Hat to:	    myself
Reported by:	kevans, Milan Obuch (freebsd-arm@dino.sk)

1 files changed, 5 insertions, 3 deletions

diff --git a/sys/dev/extres/regulator/regulator.c b/sys/dev/extres/regulator/regulator.c
index 535665fcd1ec..7cebf27aee6f 100644
--- a/sys/dev/extres/regulator/regulator.c
+++ b/sys/dev/extres/regulator/regulator.c
@@ -166,17 +166,19 @@ static void
 regulator_shutdown(void *dummy)
 {
 	struct regnode *entry;
+	int status, ret;
 	int disable = 1;
 
 	REG_TOPO_SLOCK();
 	TUNABLE_INT_FETCH("hw.regulator.disable_unused", &disable);
 	TAILQ_FOREACH(entry, &regnode_list, reglist_link) {
-		if (entry->enable_cnt == 0 &&
-		    entry->std_param.always_on == 0 && disable) {
+		if (entry->std_param.always_on == 0 && disable) {
 			if (bootverbose)
 				printf("regulator: shuting down %s\n",
 				    entry->name);
-			regnode_stop(entry, 0);
+			ret = regnode_status(entry, &status);
+			if (ret == 0 && status == REGULATOR_STATUS_ENABLED)
+				regnode_stop(entry, 0);
 		}
 	}
 	REG_TOPO_UNLOCK();