[PATCH] arm: Add clk_get_rate input parameter null check

[Wang Qing]

The input parameter of clk_get_rate() is checked with IS_ERR(),
so here we need to check null on clk.

Signed-off-by: Wang Qing <wangqing@xxxxxxxx>
---
 arch/arm/mach-ep93xx/clock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c
index 2810eb5..4313b2f
--- a/arch/arm/mach-ep93xx/clock.c
+++ b/arch/arm/mach-ep93xx/clock.c
@@ -321,6 +321,9 @@ static unsigned long get_uart_rate(struct clk *clk)
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+	if (!clk)
+		return 0;
+
 	if (clk->get_rate)
 		return clk->get_rate(clk);
 
-- 
2.7.4