[PATCH 11/16] drm/i915: not finding a fence is a non-recoverable condition

[Chris Wilson <chris@chris-wilson.co.uk>]

From: Daniel Vetter <daniel.vetter@ffwll.ch>

This happens in two cases:
- userspace got its fence accounting wrong or
- the kernel got its fence accounting wrong.

In both cases there's absolutely no point in calling evict_everything,
that will not magically bring back the missing fence. So return a
different (hopefully somewhat sensible) error code.

This has the added benefit that out-of-gtt can be distinguish from
broken fence accounting by simply looking at the ioctl return code.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 67ddda0..dd0cfac 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2663,7 +2663,7 @@ i915_gem_object_get_fence(struct drm_i915_gem_object *obj,
 
 	reg = i915_find_fence_reg(dev, pipelined);
 	if (reg == NULL)
-		return -ENOSPC;
+		return -EDEADLK;
 
 	ret = i915_gem_object_flush_fence(obj, pipelined);
 	if (ret)
-- 
1.7.5.1