[PATCH 2/2] drm/atomic: Make atomic iterators less surprising
Dmitry Osipenko
digetx at gmail.com
Wed Sep 27 12:53:17 UTC 2017
On 27.09.2017 11:35, Maarten Lankhorst wrote:
> Commit 669c9215afea ("drm/atomic: Make async plane update checks work as
> intended, v2.") assumed incorrectly that if only 1 plane is matched in
> the loop, the variables will be set to that plane. In reality we reset
> them to NULL every time a new plane was iterated. This behavior is
> surprising, so fix this by making the for loops only assign the
> variables on a match.
>
> Cc: Dmitry Osipenko <digetx at gmail.com>
> Fixes: 669c9215afea ("drm/atomic: Make async plane update checks work as intended, v2.")
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> ---
> include/drm/drm_atomic.h | 85 ++++++++++++++++++++++++------------------------
> 1 file changed, 42 insertions(+), 43 deletions(-)
>
> diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
> index 6fae95f28e10..5afd6e364fb6 100644
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -585,12 +585,12 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
> */
> #define for_each_oldnew_connector_in_state(__state, connector, old_connector_state, new_connector_state, __i) \
> for ((__i) = 0; \
> - (__i) < (__state)->num_connector && \
> - ((connector) = (__state)->connectors[__i].ptr, \
> - (old_connector_state) = (__state)->connectors[__i].old_state, \
> - (new_connector_state) = (__state)->connectors[__i].new_state, 1); \
> - (__i)++) \
> - for_each_if (connector)
> + (__i) < (__state)->num_connector; \
> + (__i)++) \
> + for_each_if ((__state)->connectors[__i].ptr && \
> + ((connector) = (__state)->connectors[__i].ptr, \
> + (old_connector_state) = (__state)->connectors[__i].old_state, \
> + (new_connector_state) = (__state)->connectors[__i].new_state, 1))
>
> /**
> * for_each_old_connector_in_state - iterate over all connectors in an atomic update
> @@ -606,11 +606,11 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
> */
> #define for_each_old_connector_in_state(__state, connector, old_connector_state, __i) \
> for ((__i) = 0; \
> - (__i) < (__state)->num_connector && \
> - ((connector) = (__state)->connectors[__i].ptr, \
> - (old_connector_state) = (__state)->connectors[__i].old_state, 1); \
> - (__i)++) \
> - for_each_if (connector)
> + (__i) < (__state)->num_connector; \
> + (__i)++) \
> + for_each_if ((__state)->connectors[__i].ptr && \
> + ((connector) = (__state)->connectors[__i].ptr, \
> + (old_connector_state) = (__state)->connectors[__i].old_state, 1))
>
> /**
> * for_each_new_connector_in_state - iterate over all connectors in an atomic update
> @@ -626,11 +626,11 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
> */
> #define for_each_new_connector_in_state(__state, connector, new_connector_state, __i) \
> for ((__i) = 0; \
> - (__i) < (__state)->num_connector && \
> - ((connector) = (__state)->connectors[__i].ptr, \
> - (new_connector_state) = (__state)->connectors[__i].new_state, 1); \
> - (__i)++) \
> - for_each_if (connector)
> + (__i) < (__state)->num_connector; \
> + (__i)++) \
> + for_each_if ((__state)->connectors[__i].ptr && \
> + ((connector) = (__state)->connectors[__i].ptr, \
> + (new_connector_state) = (__state)->connectors[__i].new_state, 1))
>
> /**
> * for_each_oldnew_crtc_in_state - iterate over all CRTCs in an atomic update
> @@ -646,12 +646,12 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
> */
> #define for_each_oldnew_crtc_in_state(__state, crtc, old_crtc_state, new_crtc_state, __i) \
> for ((__i) = 0; \
> - (__i) < (__state)->dev->mode_config.num_crtc && \
> - ((crtc) = (__state)->crtcs[__i].ptr, \
> - (old_crtc_state) = (__state)->crtcs[__i].old_state, \
> - (new_crtc_state) = (__state)->crtcs[__i].new_state, 1); \
> + (__i) < (__state)->dev->mode_config.num_crtc; \
> (__i)++) \
> - for_each_if (crtc)
> + for_each_if ((__state)->crtcs[__i].ptr && \
> + ((crtc) = (__state)->crtcs[__i].ptr, \
> + (old_crtc_state) = (__state)->crtcs[__i].old_state, \
> + (new_crtc_state) = (__state)->crtcs[__i].new_state, 1))
>
> /**
> * for_each_old_crtc_in_state - iterate over all CRTCs in an atomic update
> @@ -666,11 +666,11 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
> */
> #define for_each_old_crtc_in_state(__state, crtc, old_crtc_state, __i) \
> for ((__i) = 0; \
> - (__i) < (__state)->dev->mode_config.num_crtc && \
> - ((crtc) = (__state)->crtcs[__i].ptr, \
> - (old_crtc_state) = (__state)->crtcs[__i].old_state, 1); \
> + (__i) < (__state)->dev->mode_config.num_crtc; \
> (__i)++) \
> - for_each_if (crtc)
> + for_each_if ((__state)->crtcs[__i].ptr && \
> + ((crtc) = (__state)->crtcs[__i].ptr, \
> + (old_crtc_state) = (__state)->crtcs[__i].old_state, 1))
>
> /**
> * for_each_new_crtc_in_state - iterate over all CRTCs in an atomic update
> @@ -685,11 +685,11 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
> */
> #define for_each_new_crtc_in_state(__state, crtc, new_crtc_state, __i) \
> for ((__i) = 0; \
> - (__i) < (__state)->dev->mode_config.num_crtc && \
> - ((crtc) = (__state)->crtcs[__i].ptr, \
> - (new_crtc_state) = (__state)->crtcs[__i].new_state, 1); \
> + (__i) < (__state)->dev->mode_config.num_crtc; \
> (__i)++) \
> - for_each_if (crtc)
> + for_each_if ((__state)->crtcs[__i].ptr && \
> + ((crtc) = (__state)->crtcs[__i].ptr, \
> + (new_crtc_state) = (__state)->crtcs[__i].new_state, 1))
>
> /**
> * for_each_oldnew_plane_in_state - iterate over all planes in an atomic update
> @@ -705,12 +705,12 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
> */
> #define for_each_oldnew_plane_in_state(__state, plane, old_plane_state, new_plane_state, __i) \
> for ((__i) = 0; \
> - (__i) < (__state)->dev->mode_config.num_total_plane && \
> - ((plane) = (__state)->planes[__i].ptr, \
> - (old_plane_state) = (__state)->planes[__i].old_state, \
> - (new_plane_state) = (__state)->planes[__i].new_state, 1); \
> + (__i) < (__state)->dev->mode_config.num_total_plane; \
> (__i)++) \
> - for_each_if (plane)
> + for_each_if ((__state)->planes[__i].ptr && \
> + ((plane) = (__state)->planes[__i].ptr, \
> + (old_plane_state) = (__state)->planes[__i].old_state,\
> + (new_plane_state) = (__state)->planes[__i].new_state, 1))
>
> /**
> * for_each_old_plane_in_state - iterate over all planes in an atomic update
> @@ -725,12 +725,11 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
> */
> #define for_each_old_plane_in_state(__state, plane, old_plane_state, __i) \
> for ((__i) = 0; \
> - (__i) < (__state)->dev->mode_config.num_total_plane && \
> - ((plane) = (__state)->planes[__i].ptr, \
> - (old_plane_state) = (__state)->planes[__i].old_state, 1); \
> + (__i) < (__state)->dev->mode_config.num_total_plane; \
> (__i)++) \
> - for_each_if (plane)
> -
> + for_each_if ((__state)->planes[__i].ptr && \
> + ((plane) = (__state)->planes[__i].ptr, \
> + (old_plane_state) = (__state)->planes[__i].old_state, 1))
> /**
> * for_each_new_plane_in_state - iterate over all planes in an atomic update
> * @__state: &struct drm_atomic_state pointer
> @@ -744,11 +743,11 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
> */
> #define for_each_new_plane_in_state(__state, plane, new_plane_state, __i) \
> for ((__i) = 0; \
> - (__i) < (__state)->dev->mode_config.num_total_plane && \
> - ((plane) = (__state)->planes[__i].ptr, \
> - (new_plane_state) = (__state)->planes[__i].new_state, 1); \
> + (__i) < (__state)->dev->mode_config.num_total_plane; \
> (__i)++) \
> - for_each_if (plane)
> + for_each_if ((__state)->planes[__i].ptr && \
> + ((plane) = (__state)->planes[__i].ptr, \
> + (new_plane_state) = (__state)->planes[__i].new_state, 1))
>
> /**
> * for_each_oldnew_private_obj_in_state - iterate over all private objects in an atomic update
>
This variant also works.
Tested-by: Dmitry Osipenko <digetx at gmail.com>
--
Dmitry
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