Messages in this thread | | | Date | Mon, 22 Nov 2021 15:27:14 +0200 | From | Abel Vesa <> | Subject | Re: [PATCH v2] clk: imx: Use div64_ul instead of do_div |
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On 21-11-18 08:06:34, cgel.zte@gmail.com wrote: > From: Changcheng Deng <deng.changcheng@zte.com.cn> > > do_div() does a 64-by-32 division. Here the divisor is an unsigned long > which on some platforms is 64 bit wide. So use div64_ul instead of do_div > to avoid a possible truncation. > > Reported-by: Zeal Robot <zealci@zte.com.cn> > Signed-off-by: Changcheng Deng <deng.changcheng@zte.com.cn>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
> --- > drivers/clk/imx/clk-pllv3.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c > index 20ee9611ba6e..55497e0585a6 100644 > --- a/drivers/clk/imx/clk-pllv3.c > +++ b/drivers/clk/imx/clk-pllv3.c > @@ -247,7 +247,7 @@ static long clk_pllv3_av_round_rate(struct clk_hw *hw, unsigned long rate, > div = rate / parent_rate; > temp64 = (u64) (rate - div * parent_rate); > temp64 *= mfd; > - do_div(temp64, parent_rate); > + temp64 = div64_ul(temp64, parent_rate); > mfn = temp64; > > temp64 = (u64)parent_rate; > @@ -277,7 +277,7 @@ static int clk_pllv3_av_set_rate(struct clk_hw *hw, unsigned long rate, > div = rate / parent_rate; > temp64 = (u64) (rate - div * parent_rate); > temp64 *= mfd; > - do_div(temp64, parent_rate); > + temp64 = div64_ul(temp64, parent_rate); > mfn = temp64; > > val = readl_relaxed(pll->base); > @@ -334,7 +334,7 @@ static struct clk_pllv3_vf610_mf clk_pllv3_vf610_rate_to_mf( > /* rate = parent_rate * (mfi + mfn/mfd) */ > temp64 = rate - parent_rate * mf.mfi; > temp64 *= mf.mfd; > - do_div(temp64, parent_rate); > + temp64 = div64_ul(temp64, parent_rate); > mf.mfn = temp64; > } > > -- > 2.25.1 >
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