From 5585f7317573873f95c1bb7748322c62a6c3a919 Mon Sep 17 00:00:00 2001 From: Dinh Nguyen Date: Wed, 19 Feb 2014 15:11:10 -0600 Subject: [PATCH] clk: socfpga: Fix integer overflow in clock calculation Use 64-bit integer for calculating clock rate. Also use do_div for the 64-bit division. Signed-off-by: Graham Moore Signed-off-by: Dinh Nguyen Cc: Steffen Trumtrar Signed-off-by: Mike Turquette --- drivers/clk/socfpga/clk-pll.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/clk/socfpga/clk-pll.c b/drivers/clk/socfpga/clk-pll.c index 362004e..834b6e9 100644 --- a/drivers/clk/socfpga/clk-pll.c +++ b/drivers/clk/socfpga/clk-pll.c @@ -44,7 +44,8 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk, unsigned long parent_rate) { struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk); - unsigned long divf, divq, vco_freq, reg; + unsigned long divf, divq, reg; + unsigned long long vco_freq; unsigned long bypass; reg = readl(socfpgaclk->hw.reg); @@ -54,8 +55,9 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk, divf = (reg & SOCFPGA_PLL_DIVF_MASK) >> SOCFPGA_PLL_DIVF_SHIFT; divq = (reg & SOCFPGA_PLL_DIVQ_MASK) >> SOCFPGA_PLL_DIVQ_SHIFT; - vco_freq = parent_rate * (divf + 1); - return vco_freq / (1 + divq); + vco_freq = (unsigned long long)parent_rate * (divf + 1); + do_div(vco_freq, (1 + divq)); + return (unsigned long)vco_freq; } static struct clk_ops clk_pll_ops = { -- 2.7.4