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drm/i915: Don't try to look up object for non-existent fb

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crtc->primary->fb may be NULL upon entry to intel_pipe_set_base() if the
primary plane has previously been disabled via the universal plane
interface.  We need to check for NULL before trying to reference
old_fb's obj.

This fixes a regression introduced in

        commit a071fa0064
        Author: Daniel Vetter <daniel.vetter@ffwll.ch>
        Date:   Wed Jun 18 23:28:09 2014 +0200

        drm/i915: Introduce accurate frontbuffer tracking

Testcase: igt/kms_universal_plane
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Matt Roper 2014-06-24 17:05:02 -07:00 committed by Jani Nikula
parent 9c33baa6b3
commit 91565c85b6
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/intel_display.c
View file

@ -2690,6 +2690,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
enum pipe pipe = intel_crtc->pipe;
struct drm_framebuffer *old_fb;
struct drm_i915_gem_object *obj = to_intel_framebuffer(fb)->obj;
struct drm_i915_gem_object *old_obj;
int ret;
if (intel_crtc_has_pending_flip(crtc)) {
@ -2711,11 +2712,12 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
}
old_fb = crtc->primary->fb;
old_obj = old_fb ? to_intel_framebuffer(old_fb)->obj : NULL;
mutex_lock(&dev->struct_mutex);
ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
if (ret == 0)
i915_gem_track_fb(to_intel_framebuffer(old_fb)->obj, obj,
i915_gem_track_fb(old_obj, obj,
INTEL_FRONTBUFFER_PRIMARY(pipe));
mutex_unlock(&dev->struct_mutex);
if (ret != 0) {