From 71c6efd9930bd87249d007120425341d1293303d Mon Sep 17 00:00:00 2001
From: "Orczykowski, Juergen" <juergen.orczykowski@siemens.com>
Date: Tue, 8 May 2007 00:37:25 -0700
Subject: [PATCH] intelfb: fix ring space calculation

If there is less than RING_MIN_FREE available in the ring buffer,
dinfo->ring_space is set to a big value forcing wait_ring to return.

Fix by making ring space = 0 if ring space < RING_MIN_FREE.

Signed-off-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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