clk: Use lockdep asserts to find missing hold of prepare_lock

Add lockdep asserts for holding the prepare_lock to all functions
marking this as a requirement in description. Add this to private and
exported functions so all locking misuse could be detected during
debugging.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Michael Turquette <mturquette@linaro.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index eb0152961d3c..b0313cb4369c 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -480,6 +480,8 @@ static void clk_unprepare_unused_subtree(struct clk_core *clk)
 {
         struct clk_core *child;
 
+        lockdep_assert_held(&prepare_lock);
+
         hlist_for_each_entry(child, &clk->children, child_node)
                 clk_unprepare_unused_subtree(child);
 
@@ -503,6 +505,8 @@ static void clk_disable_unused_subtree(struct clk_core *clk)
         struct clk_core *child;
         unsigned long flags;
 
+        lockdep_assert_held(&prepare_lock);
+
         hlist_for_each_entry(child, &clk->children, child_node)
                 clk_disable_unused_subtree(child);
 
@@ -1106,6 +1110,8 @@ static unsigned long clk_core_round_rate_nolock(struct clk_core *clk,
         struct clk_core *parent;
         struct clk_hw *parent_hw;
 
+        lockdep_assert_held(&prepare_lock);
+
         if (!clk)
                 return 0;
 
@@ -1245,6 +1251,8 @@ static void __clk_recalc_accuracies(struct clk_core *clk)
         unsigned long parent_accuracy = 0;
         struct clk_core *child;
 
+        lockdep_assert_held(&prepare_lock);
+
         if (clk->parent)
                 parent_accuracy = clk->parent->accuracy;
 
@@ -1318,6 +1326,8 @@ static void __clk_recalc_rates(struct clk_core *clk, unsigned long msg)
         unsigned long parent_rate = 0;
         struct clk_core *child;
 
+        lockdep_assert_held(&prepare_lock);
+
         old_rate = clk->rate;
 
         if (clk->parent)
@@ -1525,6 +1535,8 @@ static int __clk_speculate_rates(struct clk_core *clk,
         unsigned long new_rate;
         int ret = NOTIFY_DONE;
 
+        lockdep_assert_held(&prepare_lock);
+
         new_rate = clk_recalc(clk, parent_rate);
 
         /* abort rate change if a driver returns NOTIFY_BAD or NOTIFY_STOP */
@@ -2488,6 +2500,8 @@ static void __clk_release(struct kref *ref)
         struct clk_core *clk = container_of(ref, struct clk_core, ref);
         int i = clk->num_parents;
 
+        lockdep_assert_held(&prepare_lock);
+
         kfree(clk->parents);
         while (--i >= 0)
                 kfree_const(clk->parent_names[i]);