From 95aebcb2da73079f9ecb7f4e353af71ff1f04c05 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 4 May 2017 14:08:45 +0100
Subject: [PATCH] drm/i915: Report the ring->space from intel_ring_update_space()
Git-commit: 95aebcb2da73079f9ecb7f4e353af71ff1f04c05
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900

Some callers immediately want to know the current ring->space after
calling intel_ring_update_space(), which we can freely provide via the
return parameter.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170504130846.4807-2-chris@chris-wilson.co.uk
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_ringbuffer.c |   12 ++++++++----
 drivers/gpu/drm/i915/intel_ringbuffer.h |    2 +-
 2 files changed, 9 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -52,9 +52,14 @@ static unsigned int __intel_ring_space(u
 	return (head - tail - CACHELINE_BYTES) & (size - 1);
 }
 
-void intel_ring_update_space(struct intel_ring *ring)
+unsigned int intel_ring_update_space(struct intel_ring *ring)
 {
-	ring->space = __intel_ring_space(ring->head, ring->emit, ring->size);
+	unsigned int space;
+
+	space = __intel_ring_space(ring->head, ring->emit, ring->size);
+
+	ring->space = space;
+	return space;
 }
 
 static int
@@ -1659,8 +1664,7 @@ static int wait_for_space(struct drm_i91
 
 	lockdep_assert_held(&req->i915->drm.struct_mutex);
 
-	intel_ring_update_space(ring);
-	if (ring->space >= bytes)
+	if (intel_ring_update_space(ring) >= bytes)
 		return 0;
 
 	/*
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -486,7 +486,7 @@ int intel_ring_pin(struct intel_ring *ri
 		   struct drm_i915_private *i915,
 		   unsigned int offset_bias);
 void intel_ring_reset(struct intel_ring *ring, u32 tail);
-void intel_ring_update_space(struct intel_ring *ring);
+unsigned int intel_ring_update_space(struct intel_ring *ring);
 void intel_ring_unpin(struct intel_ring *ring);
 void intel_ring_free(struct intel_ring *ring);