CLK: Check and do not allow to register clock twice

Signed-off-by: Andrey Panov <rockford@yandex.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 584e2f3242..b77d0221c3 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -212,6 +212,16 @@ struct clk *clk_get_parent(struct clk *clk)
 
 int clk_register(struct clk *clk)
 {
+	struct clk *c;
+
+	list_for_each_entry(c, &clks, list) {
+		if (!strcmp(c->name, clk->name)) {
+			pr_err("%s clk %s is already registered, skipping!\n",
+				__func__, clk->name);
+			return -EBUSY;
+		}
+	}
+
 	clk->parents = xzalloc(sizeof(struct clk *) * clk->num_parents);
 
 	list_add_tail(&clk->list, &clks);