On Mon, Jul 07, 2014 at 06:21:48PM -0700, Matt Roper wrote:
> This should hopefully simplify the display code slightly and also
> solves at least one mistake in intel_pipe_set_base() where
> to_intel_framebuffer(fb)->obj is referenced during local variable
> initialization, before 'if (!fb)' gets checked.
>
> Potential uses of this macro were identified via the following
> Coccinelle patch:
>
> @@
> expression E;
> @@
> * to_intel_framebuffer(E)->obj
>
> @@
> expression E;
> identifier I;
> @@
> I = to_intel_framebuffer(E);
> ...
> * I->obj
>
> Signed-off-by: Matt Roper <matthew.d.ro...@intel.com>
The only drawback is that I am suddenly nervous of potential NULL
objs...
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index 8c3dcdf..bc2519f 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2356,7 +2356,7 @@ static void intel_find_plane_obj(struct intel_crtc
> *intel_crtc,
> struct drm_device *dev = intel_crtc->base.dev;
> struct drm_crtc *c;
> struct intel_crtc *i;
> - struct intel_framebuffer *fb;
> + struct drm_i915_gem_object *obj;
>
> if (!intel_crtc->base.primary->fb)
> return;
> @@ -2380,11 +2380,11 @@ static void intel_find_plane_obj(struct intel_crtc
> *intel_crtc,
> if (!i->active || !c->primary->fb)
> continue;
>
> - fb = to_intel_framebuffer(c->primary->fb);
> - if (i915_gem_obj_ggtt_offset(fb->obj) == plane_config->base) {
> + obj = intel_fb_obj(c->primary->fb);
I would move this before the c->primary->fb test and rewrite the check
in terms of obj.
if (!i->active)
continue;
obj = intel_fb_obj(c->primary->fb);
if (obj == NULL)
continue;
> + if (i915_gem_obj_ggtt_offset(obj) == plane_config->base) {
> drm_framebuffer_reference(c->primary->fb);
> intel_crtc->base.primary->fb = c->primary->fb;
> - fb->obj->frontbuffer_bits |=
> INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe);
> + obj->frontbuffer_bits |=
> INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe);
> break;
> }
> }
>
> @@ -9613,7 +9601,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
>
> work->event = event;
> work->crtc = crtc;
> - work->old_fb_obj = to_intel_framebuffer(old_fb)->obj;
> + work->old_fb_obj = intel_fb_obj(old_fb);
> INIT_WORK(&work->work, intel_unpin_work_fn);
Here I would appreciate an
if (WARN_ON(intel_fb_obj(old_fb) == NULL))
return -EBUSY;
at the start of intel_crtc_page_flip.
>
> ret = drm_crtc_vblank_get(crtc);
> @@ -12971,8 +12952,8 @@ void intel_modeset_gem_init(struct drm_device *dev)
> if (!c->primary->fb)
> continue;
>
> - fb = to_intel_framebuffer(c->primary->fb);
> - if (intel_pin_and_fence_fb_obj(dev, fb->obj, NULL)) {
> + obj = intel_fb_obj(c->primary->fb);
Same again, change the check on primary->fb to be a check on obj.
> + if (intel_pin_and_fence_fb_obj(dev, obj, NULL)) {
> DRM_ERROR("failed to pin boot fb on pipe %d\n",
> to_intel_crtc(c)->pipe);
> drm_framebuffer_unreference(c->primary->fb);
Elsewhere a GPF for a NULL pointer is reasonable.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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