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Input: touchscreen - avoid bitwise vs logical OR warning
commit a02dcde595
upstream.
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>
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
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commit
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1 changed files with 9 additions and 9 deletions
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@ -81,8 +81,8 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
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touchscreen_get_prop_u32(dev, "touchscreen-size-x",
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input_abs_get_max(input,
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axis) + 1,
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&maximum) |
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touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x",
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&maximum);
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data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x",
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input_abs_get_fuzz(input, axis),
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&fuzz);
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if (data_present)
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@ -95,8 +95,8 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
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touchscreen_get_prop_u32(dev, "touchscreen-size-y",
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input_abs_get_max(input,
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axis) + 1,
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&maximum) |
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touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y",
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&maximum);
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data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y",
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input_abs_get_fuzz(input, axis),
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&fuzz);
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if (data_present)
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@ -106,11 +106,11 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
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data_present = touchscreen_get_prop_u32(dev,
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"touchscreen-max-pressure",
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input_abs_get_max(input, axis),
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&maximum) |
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touchscreen_get_prop_u32(dev,
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"touchscreen-fuzz-pressure",
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input_abs_get_fuzz(input, axis),
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&fuzz);
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&maximum);
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data_present |= touchscreen_get_prop_u32(dev,
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"touchscreen-fuzz-pressure",
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input_abs_get_fuzz(input, axis),
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&fuzz);
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if (data_present)
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touchscreen_set_params(input, axis, 0, maximum, fuzz);
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