From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Date: Thu, 22 Jan 2015 23:09:56 +0000 (+0100)
Subject: staging: iio: ad2s1200: Fix sign extension
X-Git-Tag: omap-for-v4.1/wl12xx-dt~47^2~4^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f7067a5ad717d4dbb4faa3ec56744152f6ba97ad;p=pandora-kernel.git

staging: iio: ad2s1200: Fix sign extension

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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