clk: handle NULL struct clk gracefully
At some point changes to clk_set_rate and clk_set_parent introduced a
bug whereby NULL struct clk pointers were treated as an error. This is
in violation of the API in include/linux/clk.h. Reintroduce graceful
handling of NULL clk's by bailing from clk_set_rate and clk_set_parent
with return codes of zero.
Signed-off-by: Mike Turquette <mturquette@linaro.org>
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index bc02037..7c43762 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1428,6 +1428,9 @@
struct clk *top, *fail_clk;
int ret = 0;
+ if (!clk)
+ return 0;
+
/* prevent racing with updates to the clock topology */
clk_prepare_lock();
@@ -1567,7 +1570,10 @@
u8 p_index = 0;
unsigned long p_rate = 0;
- if (!clk || !clk->ops)
+ if (!clk)
+ return 0;
+
+ if (!clk->ops)
return -EINVAL;
/* verify ops for for multi-parent clks */
