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drm/exynos: check crtc's dpms mode at page flip

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when page flip is requested, crtc's dpms mode should be on.
if not on, return -EINVAL so that it doesn't access hardware.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Inki Dae 2012-09-11 18:25:21 +09:00
commit ef6223dc6b
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/exynos/exynos_drm_crtc.c
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@ -207,6 +207,12 @@ static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
DRM_DEBUG_KMS("%s\n", __FILE__);
/* when the page flip is requested, crtc's dpms should be on */
if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
DRM_ERROR("failed page flip request.\n");
return -EINVAL;
}
mutex_lock(&dev->struct_mutex);
if (event) {