This is a note to let you know that I've just added the patch titled
PM: AVS: qcom-cpr: Use div64_ul instead of do_div
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pm-avs-qcom-cpr-use-div64_ul-instead-of-do_div.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0136610e36946d2ecb6aa2efefd30bee8ed040bf
Author: Changcheng Deng <deng.changcheng@xxxxxxxxxx>
Date: Thu Nov 25 01:43:11 2021 +0000
PM: AVS: qcom-cpr: Use div64_ul instead of do_div
[ 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>
diff --git a/drivers/soc/qcom/cpr.c b/drivers/soc/qcom/cpr.c
index b24cc77d1889f..6298561bc29c9 100644
--- a/drivers/soc/qcom/cpr.c
+++ b/drivers/soc/qcom/cpr.c
@@ -1043,7 +1043,7 @@ 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
