Messages in this thread | | | Date | Mon, 11 Mar 2019 07:22:00 +0100 | From | Gerd Hoffmann <> | Subject | Re: [PATCH] drm/bochs: Fix NULL dereference on atomic_disable helper |
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On Sun, Mar 10, 2019 at 06:21:50PM -0300, Rodrigo Siqueira wrote: > When the subtest basic-plain-flip from IGT project was executed on Bochs > driver, the following bug appears: > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
> ? drm_atomic_helper_commit_modeset_disables+0x396/0x3e0 [drm_kms_helper]
> +static void bochs_crtc_atomic_disable(struct drm_crtc *crtc, > + struct drm_crtc_state *old_state) > +{ > +} > + > static void bochs_crtc_atomic_flush(struct drm_crtc *crtc, > struct drm_crtc_state *old_crtc_state) > { > @@ -66,6 +71,7 @@ static const struct drm_crtc_funcs bochs_crtc_funcs = { > static const struct drm_crtc_helper_funcs bochs_helper_funcs = { > .mode_set_nofb = bochs_crtc_mode_set_nofb, > .atomic_enable = bochs_crtc_atomic_enable, > + .atomic_disable = bochs_crtc_atomic_disable,
Shouldn't we make the callback optional instead of adding empty dummy functions to drivers?
cheers, Gerd
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