staging: iio: ad2s1200: Fix sign extension

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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>

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Rasmus Villemoes 2015-01-23 00:09:56 +01:00 • committed by Jonathan Cameron

parent 89bb35e200

commit f7067a5ad7

1 changed files with 2 additions and 1 deletions

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drivers/staging/iio/resolver/ad2s1200.c

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