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HID: core: don't use negative operands when shift

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The recent C standard in 6.5.7 paragraph 4 defines that operands for
bitwise shift operators should be non-negative, otherwise it's an
undefined behaviour.

Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Andy Shevchenko 2017-06-13 12:22:22 +03:00 committed by Jiri Kosina
parent 91b9ae48aa
commit 08585e43d2
1 changed files with 1 additions and 1 deletions
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2
drivers/hid/hid-core.c
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@ -1046,7 +1046,7 @@ static s32 snto32(__u32 value, unsigned n)
case 16: return ((__s16)value);
case 32: return ((__s32)value);
}
return value & (1 << (n - 1)) ? value | (-1 << n) : value;
return value & (1 << (n - 1)) ? value | (~0U << n) : value;
}
s32 hid_snto32(__u32 value, unsigned n)