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drm/radeon/kms: unpin fb in atombios crtc disable

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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@research.bell-labs.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ilija Hadzic 2013-11-02 23:00:19 -04:00 committed by Alex Deucher
parent 0f57bca922
commit 75b871e2d8
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/radeon/atombios_crtc.c
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@ -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);