diff options
| author | Nathan Chancellor <nathan@kernel.org> | 2021-10-15 13:13:06 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2021-10-15 22:22:54 -0700 |
| commit | a02dcde595f7cbd240ccd64de96034ad91cffc40 (patch) | |
| tree | 24fdcd33767fb1d1c5da58ea711c28eafa7c0a2d /drivers | |
| parent | 3378a07daa6cdd11e042797454c706d1c69f9ca6 (diff) | |
Input: touchscreen - avoid bitwise vs logical OR warning
A new warning in clang points out a few places in this driver where a
bitwise OR is being used with boolean types:
drivers/input/touchscreen.c:81:17: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-x",
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This use of a bitwise OR is intentional, as bitwise operations do not
short circuit, which allows all the calls to touchscreen_get_prop_u32()
to happen so that the last parameter is initialized while coalescing the
results of the calls to make a decision after they are all evaluated.
To make this clearer to the compiler, use the '|=' operator to assign
the result of each touchscreen_get_prop_u32() call to data_present,
which keeps the meaning of the code the same but makes it obvious that
every one of these calls is expected to happen.
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reported-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20211014205757.3474635-1-nathan@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/input/touchscreen.c | 42 |
1 files changed, 21 insertions, 21 deletions
diff --git a/drivers/input/touchscreen.c b/drivers/input/touchscreen.c index dd18cb917c4d..4620e20d0190 100644 --- a/drivers/input/touchscreen.c +++ b/drivers/input/touchscreen.c @@ -80,27 +80,27 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch, data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-x", input_abs_get_min(input, axis_x), - &minimum) | - touchscreen_get_prop_u32(dev, "touchscreen-size-x", - input_abs_get_max(input, - axis_x) + 1, - &maximum) | - touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x", - input_abs_get_fuzz(input, axis_x), - &fuzz); + &minimum); + data_present |= touchscreen_get_prop_u32(dev, "touchscreen-size-x", + input_abs_get_max(input, + axis_x) + 1, + &maximum); + data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x", + input_abs_get_fuzz(input, axis_x), + &fuzz); if (data_present) touchscreen_set_params(input, axis_x, minimum, maximum - 1, fuzz); data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-y", input_abs_get_min(input, axis_y), - &minimum) | - touchscreen_get_prop_u32(dev, "touchscreen-size-y", - input_abs_get_max(input, - axis_y) + 1, - &maximum) | - touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y", - input_abs_get_fuzz(input, axis_y), - &fuzz); + &minimum); + data_present |= touchscreen_get_prop_u32(dev, "touchscreen-size-y", + input_abs_get_max(input, + axis_y) + 1, + &maximum); + data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y", + input_abs_get_fuzz(input, axis_y), + &fuzz); if (data_present) touchscreen_set_params(input, axis_y, minimum, maximum - 1, fuzz); @@ -108,11 +108,11 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch, data_present = touchscreen_get_prop_u32(dev, "touchscreen-max-pressure", input_abs_get_max(input, axis), - &maximum) | - touchscreen_get_prop_u32(dev, - "touchscreen-fuzz-pressure", - input_abs_get_fuzz(input, axis), - &fuzz); + &maximum); + data_present |= touchscreen_get_prop_u32(dev, + "touchscreen-fuzz-pressure", + input_abs_get_fuzz(input, axis), + &fuzz); if (data_present) touchscreen_set_params(input, axis, 0, maximum, fuzz); |