On 14/04/14 11:43, Tomi Valkeinen wrote: > On 11/04/14 14:50, Ville Syrjälä wrote: > >>> So the explicit unref done by drm_plane_force_disable() seems a bit out >>> of place. I can't figure out which drm_framebuffer_reference() would be >>> the matching one for the unref done by drm_plane_force_disable(). >>> >>> Any ideas what ref is that? Or is the __drm_framebuffer_unreference() >>> extra in drm_plane_force_disable()? >> >> That's the reference that was taken by the drm_mode_setplane() when it >> succesfully called the .update_plane() hook. > > But drm_mode_setplane() is called via DRM_IOCTL_MODE_SETPLANE, which is > only used for "proper" planes, not for crtc primary planes, right? > > At least I don't see drm_mode_setplane() in my stack traces, and git > grep doesn't show it called via any other means than ioctl. > > I am not using any planes from my app, just the crtc and (indirectly) > its primary plane. So here's a summary of the fb refs and unrefs. It still seems to me that the drm_plane_force_disable does an extra unref. Either that, or omapdrm is missing something that takes the matching reference. A line like this in the summary below: 2) ref36/3 drm_mode_setcrtc / drm_framebuffer_lookup Means that "2" is the number I assigned to that ref, and there's a matching unref with 2) prefix later. ref36/2 means that FB ID 36 was referenced, and ref count is 3. And the rest of the line shows rough idea of the stack trace where the ref/unref happens. # DRM_IOCTL_MODE_ADDFB 2 0) kref_init 1) ref36/2 drm_mode_addfb2 # DRM_IOCTL_MODE_SETCRTC 2) ref36/3 drm_mode_setcrtc / drm_framebuffer_lookup 3) ref36/4 drm_mode_setcrtc / drm_mode_set_config_internal 2) unref36/3 drm_mode_setcrtc # pin new fb 4) ref36/4 apply_worker / omap_plane_pre_apply # BREAK # RELEASE 1) unref36/3 drm_release / drm_fb_release / __drm_framebuffer_unregister 3) unref36/2 drm_release / drm_fb_release / drm_framebuffer_remove / drm_mode_set_config_internal ?) unref36/1 drm_release / drm_fb_release / drm_framebuffer_remove / drm_plane_force_disable 0) unref36/0 drm_release / drm_fb_release / drm_framebuffer_remove # unpin old fb 4) unref36/-1 flip_worker / unpin_worker / drm_framebuffer_unreference All the other unrefs I can explain, except the drm_plane_force_disable() one. Tomi
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