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Keep the checks, but then call sign_extend32() to perform the actual conversion. Signed-off-by: Dmitry Torokhov --- drivers/hid/hid-core.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 00942d40fe08..5f62df91030d 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1313,9 +1313,7 @@ int hid_open_report(struct hid_device *device) EXPORT_SYMBOL_GPL(hid_open_report); /* - * Convert a signed n-bit integer to signed 32-bit integer. Common - * cases are done through the compiler, the screwed things has to be - * done by hand. + * Convert a signed n-bit integer to signed 32-bit integer. */ static s32 snto32(__u32 value, unsigned n) @@ -1326,12 +1324,7 @@ static s32 snto32(__u32 value, unsigned n) if (n > 32) n = 32; - switch (n) { - case 8: return ((__s8)value); - case 16: return ((__s16)value); - case 32: return ((__s32)value); - } - return value & (1 << (n - 1)) ? value | (~0U << n) : value; + return sign_extend32(value, n - 1); } s32 hid_snto32(__u32 value, unsigned n)