linux-kernel - [PATCH] power: supply: da9150: use div64_u64() instead of do

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Message-Id: <1644395986-4349-1-git-send-email-wangqing@vivo.com>
Date:   Wed,  9 Feb 2022 00:39:46 -0800
From:   Qing Wang <wangqing@...o.com>
To:     Support Opensource <support.opensource@...semi.com>,
        Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] power: supply: da9150: use div64_u64() instead of do_div()

From: Wang Qing <wangqing@...o.com>

do_div() does a 64-by-32 division.
When the divisor is u64, do_div() truncates it to 32 bits, this means it
can test non-zero and be truncated to zero for division.

fix do_div.cocci warning:
do_div() does a 64-by-32 division, please consider using div64_u64 instead.

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 drivers/power/supply/da9150-fg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/supply/da9150-fg.c b/drivers/power/supply/da9150-fg.c
index 6e36782..896491a
--- a/drivers/power/supply/da9150-fg.c
+++ b/drivers/power/supply/da9150-fg.c
@@ -250,7 +250,7 @@ static int da9150_fg_current_avg(struct da9150_fg *fg,
 	div = (u64) (sd_gain * shunt_val * 65536ULL);
 	do_div(div, 1000000);
 	res = (u64) (iavg * 1000000ULL);
-	do_div(res, div);
+	div64_u64(res, div);
 
 	val->intval = (int) res;
 
-- 
2.7.4