[PATCH] staging: iio: ad5933: Use div64_ul instead of do_div

Deepak R Varma
2022-10-27T21:29:04Z

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. Issue was identified using the
coccicheck tool.

Signed-off-by: Deepak R Varma <drv@mailo.com>
---
drivers/staging/iio/impedance-analyzer/ad5933.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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