linux-kernel - [PATCH] staging: iio: Use div64_ul instead of do

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Date:   Wed, 19 Oct 2022 14:38:29 +0900
From:   Kang Minchul <tegongkang@...il.com>
To:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-iio@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Kang Minchul <tegongkang@...il.com>
Subject: [PATCH] staging: iio: Use div64_ul instead of do_div

Using div64_ul instead of do_div (64-by-32 division) is more
recommended by coccicheck because this can avoid potential truncation.

So this commit changes do_div to div64_ul and
remove coccicheck warnings.

Signed-off-by: Kang Minchul <tegongkang@...il.com>
---
 drivers/staging/iio/frequency/ad9832.c          | 2 +-
 drivers/staging/iio/frequency/ad9834.c          | 2 +-
 drivers/staging/iio/impedance-analyzer/ad5933.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
index 6f9eebd6c7ee..cd038480f63c 100644
--- a/drivers/staging/iio/frequency/ad9832.c
+++ b/drivers/staging/iio/frequency/ad9832.c
@@ -122,7 +122,7 @@ static unsigned long ad9832_calc_freqreg(unsigned long mclk, unsigned long fout)
 {
 	unsigned long long freqreg = (u64)fout *
 				     (u64)((u64)1L << AD9832_FREQ_BITS);
-	do_div(freqreg, mclk);
+	freqreg = div64_ul(freqreg, mclk);
 	return freqreg;
 }
 
diff --git a/drivers/staging/iio/frequency/ad9834.c b/drivers/staging/iio/frequency/ad9834.c
index 2b4267a87e65..cfe933ef40d0 100644
--- a/drivers/staging/iio/frequency/ad9834.c
+++ b/drivers/staging/iio/frequency/ad9834.c
@@ -102,7 +102,7 @@ static unsigned int ad9834_calc_freqreg(unsigned long mclk, unsigned long fout)
 {
 	unsigned long long freqreg = (u64)fout * (u64)BIT(AD9834_FREQ_BITS);
 
-	do_div(freqreg, mclk);
+	freqreg = div64_ul(freqreg, mclk);
 	return freqreg;
 }
 
diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c
index f177b20f0f2d..730bb31a20d8 100644
--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
@@ -196,7 +196,7 @@ static int ad5933_set_freq(struct ad5933_state *st,
 	} dat;
 
 	freqreg = (u64)freq * (u64)(1 << 27);
-	do_div(freqreg, st->mclk_hz / 4);
+	freqreg = div64_ul(freqreg, st->mclk_hz / 4);
 
 	switch (reg) {
 	case AD5933_REG_FREQ_START:
-- 
2.34.1