[PATCH] clk: Fix incorrect rate comparison in clk_set_rate()

[Alexander Shiyan <eagle.alexander923@gmail.com>]

The original condition in clk_set_rate() compared the current clock rate
against clk_round_rate(clk, rate). However, when the clock driver doesn't
implement .round_rate(), clk_round_rate() falls back to returning the
current clock rate via clk_get_rate(). This created a situation where:
clk_get_rate(clk) == clk_round_rate(clk, rate)
would always evaluate to true when .round_rate() is unimplemented.

Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com>
---
 drivers/clk/clk.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index bd36878280..8ecfe35094 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -169,7 +169,8 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);
 
-	if (clk_get_rate(clk) == clk_round_rate(clk, rate))
+	if (clk_get_rate(clk) ==
+	    (clk->ops->round_rate ? clk_round_rate(clk, rate) : rate))
 		return 0;
 
 	if (!clk->ops->set_rate)
-- 
2.39.1