commit 63589e92c2d975cc63222e5bd4a9a1fa2a1187ac
author Stephen Boyd <sboyd@codeaurora.org> Wed Mar 26 16:06:37 2014 -0700
committer Mike Turquette <mturquette@linaro.org> Wed Apr 30 11:51:50 2014 -0700
tree c534ea7df24e67a08b94f86cf99e8ce437c7f9af
parent 8f2c2db132cf5f4ffb4b9702ddb7e6bc5a343814

clk: Ignore error and NULL pointers passed to clk_{unprepare, disable}()

This simplifies error paths in drivers that use optional clocks
by allowing the NULL or error pointer to be passed
unconditionally.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

drivers/clk/clk.c

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 3c02be7..4d56220 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -822,6 +822,9 @@
  */
 void clk_unprepare(struct clk *clk)
 {
+	if (IS_ERR_OR_NULL(clk))
+		return;
+
 	clk_prepare_lock();
 	__clk_unprepare(clk);
 	clk_prepare_unlock();
@@ -883,9 +886,6 @@
 	if (!clk)
 		return;
 
-	if (WARN_ON(IS_ERR(clk)))
-		return;
-
 	if (WARN_ON(clk->enable_count == 0))
 		return;
 
@@ -914,6 +914,9 @@
 {
 	unsigned long flags;
 
+	if (IS_ERR_OR_NULL(clk))
+		return;
+
 	flags = clk_enable_lock();
 	__clk_disable(clk);
 	clk_enable_unlock(flags);