target/linux/generic/backport-4.19/506-v5.1-iio-chemical-sps30-Explicity-truncate-constant-by-ma.patch

   1 From 78b75ab3f8c9dfac563b81105a1b838ec37a940e Mon Sep 17 00:00:00 2001
   2 From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
   3 Date: Sun, 13 Oct 2019 10:55:15 +0100
   4 Subject: [PATCH] iio: chemical: sps30: Explicity truncate constant by masking
   5
   6 When breaking up a constant to write to two 8 bit registers
   7 it isn't obvious to sparse that it was intentional.
   8
   9 CHECK   drivers/iio/chemical/sps30.c
  10 drivers/iio/chemical/sps30.c:120:30: warning: cast truncates bits from constant value (8004 becomes 4)
  11
  12 So in the interests of minimising noisy warnings, let us add
  13 a mask.
  14
  15 Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
  16 Acked-by: Tomasz Duszynski <tduszyns@gmail.com>
  17 ---
  18  drivers/iio/chemical/sps30.c | 2 +-
  19  1 file changed, 1 insertion(+), 1 deletion(-)
  20
  21 diff --git a/drivers/iio/chemical/sps30.c b/drivers/iio/chemical/sps30.c
  22 index edbb956e81e8..acb9f8ecbb3d 100644
  23 --- a/drivers/iio/chemical/sps30.c
  24 +++ b/drivers/iio/chemical/sps30.c
  25 @@ -117,7 +117,7 @@ static int sps30_do_cmd(struct sps30_state *state, u16 cmd, u8 *data, int size)
  26                 break;
  27         case SPS30_READ_AUTO_CLEANING_PERIOD:
  28                 buf[0] = SPS30_AUTO_CLEANING_PERIOD >> 8;
  29 -               buf[1] = (u8)SPS30_AUTO_CLEANING_PERIOD;
  30 +               buf[1] = (u8)(SPS30_AUTO_CLEANING_PERIOD & 0xff);
  31                 /* fall through */
  32         case SPS30_READ_DATA_READY_FLAG:
  33         case SPS30_READ_DATA: