clk: Add some more lockdep assertions

We don't check to make sure the enable_lock is held across
enable/disable and we don't check if the prepare_lock is held
across prepare/unprepare. Add some asserts to catch any future
locking problems.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/clk.c

@@ -543,6 +543,8 @@ EXPORT_SYMBOL_GPL(__clk_mux_determine_rate_closest);
 
 static void clk_core_unprepare(struct clk_core *core)
 {
+	lockdep_assert_held(&prepare_lock);
+
 	if (!core)
 		return;
 
@@ -589,6 +591,8 @@ static int clk_core_prepare(struct clk_core *core)
 {
 	int ret = 0;
 
+	lockdep_assert_held(&prepare_lock);
+
 	if (!core)
 		return 0;
 
@@ -644,6 +648,8 @@ EXPORT_SYMBOL_GPL(clk_prepare);
 
 static void clk_core_disable(struct clk_core *core)
 {
+	lockdep_assert_held(&enable_lock);
+
 	if (!core)
 		return;
 
@@ -692,6 +698,8 @@ static int clk_core_enable(struct clk_core *core)
 {
 	int ret = 0;
 
+	lockdep_assert_held(&enable_lock);
+
 	if (!core)
 		return 0;