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Rasmus Villemoes authored
The line above makes vel a 12-bit quantity (st->rx[] is u8). The intention is to sign-extend vel using bit 11 as the sign bit. But because of C's promotion rules "vel = (vel << 4) >> 4;" is actually a no-op, since vel is promoted to int before the inner shift. sign_extend32 works equally well for 8 and 16 bits types, so use that. Signed-off-by:
Rasmus Villemoes <linux@rasmusvillemoes.dk> Acked-by:
Lars-Peter Clausen <lars@metafoo.de> Signed-off-by:
Jonathan Cameron <jic23@kernel.org>
f7067a5a