When drm_helper_disable_unused_functions calls disable
function of the CRTC, it also sets the crtc->fb pointer
to NULL. This can later (when the mode on that CRTC is setup
again from user space) cause ***_do_set_base functions to
"think" that there is no old buffer and skip the unpinning
code. Consequently, the buffer that has been NULL-ified in
drm_helper_disable_unused_functions will never be unpinned
causing a leak in VRAM.
This patch plugs the leak by unpinning the frame buffer
in crtc_disable function.
Signed-off-by: Ilija Hadzic <ihadzic at research.bell-labs.com>
---
drivers/gpu/drm/radeon/atombios_crtc.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
b/drivers/gpu/drm/radeon/atombios_crtc.c
index bf87f6d..9eb24a3 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -1910,6 +1910,21 @@ static void atombios_crtc_disable(struct drm_crtc *crtc)
int i;
atombios_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
+ if (crtc->fb) {
+ int r;
+ struct radeon_framebuffer *radeon_fb;
+ struct radeon_bo *rbo;
+
+ radeon_fb = to_radeon_framebuffer(crtc->fb);
+ rbo = gem_to_radeon_bo(radeon_fb->obj);
+ r = radeon_bo_reserve(rbo, false);
+ if (unlikely(r))
+ DRM_ERROR("failed to reserve rbo before unpin\n");
+ else {
+ radeon_bo_unpin(rbo);
+ radeon_bo_unreserve(rbo);
+ }
+ }
/* disable the GRPH */
if (ASIC_IS_DCE4(rdev))
WREG32(EVERGREEN_GRPH_ENABLE + radeon_crtc->crtc_offset, 0);
--
1.8.2.1
