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Date: Mon, 3 Dec 2012 16:14:37 +0800 From: Haojian Zhuang <haojian.zhuang@...il.com> To: mturquette@...com, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Cc: Haojian Zhuang <haojian.zhuang@...il.com> Subject: [PATCH] clk: factor: calculate rate by do_div clk->rate = parent->rate / div * mult The formula is OK. But it may overflow while we do operate with unsigned long. So use do_div instead. Signed-off-by: Haojian Zhuang <haojian.zhuang@...il.com> --- drivers/clk/clk-fixed-factor.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c index a489985..1ef271e 100644 --- a/drivers/clk/clk-fixed-factor.c +++ b/drivers/clk/clk-fixed-factor.c @@ -28,8 +28,11 @@ static unsigned long clk_factor_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { struct clk_fixed_factor *fix = to_clk_fixed_factor(hw); + unsigned long long int rate; - return parent_rate * fix->mult / fix->div; + rate = (unsigned long long int)parent_rate * fix->mult; + do_div(rate, fix->div); + return (unsigned long)rate; } static long clk_factor_round_rate(struct clk_hw *hw, unsigned long rate, -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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