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PM: AVS: qcom-cpr: Use div64_ul instead of do_div
author
Changcheng Deng
<deng.changcheng@zte.com.cn>
Thu, 25 Nov 2021 01:43:11 +0000
(
01:43
+0000)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Thu, 27 Jan 2022 10:04:46 +0000
(11:04 +0100)
[ 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@zte.com.cn>
Signed-off-by: Changcheng Deng <deng.changcheng@zte.com.cn>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link:
https://lore.kernel.org/r/20211125014311.45942-1-deng.changcheng@zte.com.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/soc/qcom/cpr.c
patch
|
blob
|
history
diff --git
a/drivers/soc/qcom/cpr.c
b/drivers/soc/qcom/cpr.c
index
4ce8e81
..
84dd934
100644
(file)
--- 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