Hi Daniel,
On Wed, 16 Mar 2016 16:17:38 +0100
Daniel Vetter <daniel@xxxxxxxx> wrote:
> On Wed, Mar 16, 2016 at 02:57:35PM +0100, Boris Brezillon wrote:
> > Add a ->cleanup_fb() operation to avoid memory leaks when the atomic
> > operation is interrupted after the ->prepare_fb() call.
> >
> > Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> > Fixes 2389fc1 ("drm: atmel-hlcdc: Atomic mode-setting conversion")
> > Reviewed-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> > Tested-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h | 2 ++
> > drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 22 +++++++++++++++++++---
> > 2 files changed, 21 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> > index fed517f..ec64140 100644
> > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> > @@ -81,11 +81,13 @@ struct atmel_hlcdc_plane_properties {
> > * @layer: HLCDC layer structure
> > * @properties: pointer to the property definitions structure
> > * @rotation: current rotation status
> > + * @prepared: flagging the plane has prepared for an atomic update
> > */
> > struct atmel_hlcdc_plane {
> > struct drm_plane base;
> > struct atmel_hlcdc_layer layer;
> > struct atmel_hlcdc_plane_properties *properties;
> > + bool prepared;
> > };
> >
> > static inline struct atmel_hlcdc_plane *
> > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> > index 1ffe9c3..35027d0 100644
> > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> > @@ -715,11 +715,25 @@ static int atmel_hlcdc_plane_prepare_fb(struct drm_plane *p,
> > const struct drm_plane_state *new_state)
> > {
> > struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
> > + int ret;
> >
> > - if (!new_state->fb)
> > - return 0;
> > + ret = atmel_hlcdc_layer_update_start(&plane->layer);
> > + if (!ret)
> > + plane->prepared = true;
>
> Atomic helpers will keep track of this for you, and only call ->cleanup_fb
> on a plane combo where it did (successfully) call ->prepare_fb.
Hm, it's not exactly encoding the same thing. What I want to do here is
call atmel_hlcdc_layer_update_rollback() only if the atomic update has
failed (see below, I set ->prepared back to false in the
->atomic_update() method). AFAICT, ->cleanup_fb() is also called
when the whole operation succeed (and in this case I don't want to
call atmel_hlcdc_layer_update_rollback()).
Let me know if you see a better approach to do that.
Thanks,
Boris
> -Daniel
>
> > +
> > + return ret;
> > +}
> > +
> > +static void atmel_hlcdc_plane_cleanup_fb(struct drm_plane *p,
> > + const struct drm_plane_state *old_state)
> > +{
> > + struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
> > +
> > + if (!plane->prepared)
> > + return;
> >
> > - return atmel_hlcdc_layer_update_start(&plane->layer);
> > + atmel_hlcdc_layer_update_rollback(&plane->layer);
> > + plane->prepared = false;
> > }
> >
> > static void atmel_hlcdc_plane_atomic_update(struct drm_plane *p,
> > @@ -739,6 +753,7 @@ static void atmel_hlcdc_plane_atomic_update(struct drm_plane *p,
> > atmel_hlcdc_plane_update_disc_area(plane, state);
> >
> > atmel_hlcdc_layer_update_commit(&plane->layer);
> > + plane->prepared = false;
> > }
> >
> > static void atmel_hlcdc_plane_atomic_disable(struct drm_plane *p,
> > @@ -844,6 +859,7 @@ static void atmel_hlcdc_plane_init_properties(struct atmel_hlcdc_plane *plane,
> >
> > static struct drm_plane_helper_funcs atmel_hlcdc_layer_plane_helper_funcs = {
> > .prepare_fb = atmel_hlcdc_plane_prepare_fb,
> > + .cleanup_fb = atmel_hlcdc_plane_cleanup_fb,
> > .atomic_check = atmel_hlcdc_plane_atomic_check,
> > .atomic_update = atmel_hlcdc_plane_atomic_update,
> > .atomic_disable = atmel_hlcdc_plane_atomic_disable,
> > --
> > 2.5.0
> >
>
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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