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drm/i915: Return error from i915_gem_object_get_fence_reg() when failing.

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Previously, the caller would continue along without knowing that the
function failed, resulting in potential mis-rendering.  Right now vm_fault
just returns SIGBUS in that case, and we may need to disable signal handling
to avoid that happening.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
Eric Anholt 2009-01-27 10:33:49 -08:00 committed by Dave Airlie
parent ab657db12d
commit d9ddcb96e0
1 changed files with 13 additions and 7 deletions
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20
drivers/gpu/drm/i915/i915_gem.c
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@ -52,7 +52,7 @@ static void i915_gem_object_free_page_list(struct drm_gem_object *obj);
static int i915_gem_object_wait_rendering(struct drm_gem_object *obj);
static int i915_gem_object_bind_to_gtt(struct drm_gem_object *obj,
unsigned alignment);
static void i915_gem_object_get_fence_reg(struct drm_gem_object *obj);
static int i915_gem_object_get_fence_reg(struct drm_gem_object *obj);
static void i915_gem_clear_fence_reg(struct drm_gem_object *obj);
static int i915_gem_evict_something(struct drm_device *dev);
static int i915_gem_phys_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
@ -585,8 +585,11 @@ int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
/* Need a new fence register? */
if (obj_priv->fence_reg == I915_FENCE_REG_NONE &&
obj_priv->tiling_mode != I915_TILING_NONE)
i915_gem_object_get_fence_reg(obj);
obj_priv->tiling_mode != I915_TILING_NONE) {
ret = i915_gem_object_get_fence_reg(obj);
if (ret != 0)
return VM_FAULT_SIGBUS;
}
pfn = ((dev->agp->base + obj_priv->gtt_offset) >> PAGE_SHIFT) +
page_offset;
@ -1513,7 +1516,7 @@ static void i830_write_fence_reg(struct drm_i915_fence_reg *reg)
* It then sets up the reg based on the object's properties: address, pitch
* and tiling format.
*/
static void
static int
i915_gem_object_get_fence_reg(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
@ -1563,10 +1566,11 @@ try_again:
* objects to finish before trying again.
*/
if (i == dev_priv->num_fence_regs) {
ret = i915_gem_object_wait_rendering(reg->obj);
ret = i915_gem_object_set_to_gtt_domain(reg->obj, 0);
if (ret) {
WARN(ret, "wait_rendering failed: %d\n", ret);
return;
WARN(ret != -ERESTARTSYS,
"switch to GTT domain failed: %d\n", ret);
return ret;
}
goto try_again;
}
@ -1591,6 +1595,8 @@ try_again:
i915_write_fence_reg(reg);
else
i830_write_fence_reg(reg);
return 0;
}
/**