[PATCH AUTOSEL 5.16 162/217] PM: AVS: qcom-cpr: Use div64_ul instead of do_div

From: Sasha Levin
Date: Mon Jan 17 2022 - 21:35:49 EST


From: Changcheng Deng <deng.changcheng@xxxxxxxxxx>

[ Upstream commit 92c550f9ffd2884bb5def52b5c0485a35e452784 ]

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@xxxxxxxxxx>
Signed-off-by: Changcheng Deng <deng.changcheng@xxxxxxxxxx>
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211125014311.45942-1-deng.changcheng@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/soc/qcom/cpr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/cpr.c b/drivers/soc/qcom/cpr.c
index 1d818a8ba2089..e9b854ed1bdfd 100644
--- a/drivers/soc/qcom/cpr.c
+++ b/drivers/soc/qcom/cpr.c
@@ -1010,7 +1010,7 @@ static int cpr_interpolate(const struct corner *corner, int step_volt,
return corner->uV;

temp = f_diff * (uV_high - uV_low);
- do_div(temp, f_high - f_low);
+ temp = div64_ul(temp, f_high - f_low);

/*
* max_volt_scale has units of uV/MHz while freq values
--
2.34.1