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373701b1fc
We have serious dangling else bugs waiting to happen in our for_each_
style macros with ifs. Consider, for example,
#define drm_for_each_plane_mask(plane, dev, plane_mask) \
list_for_each_entry((plane), &(dev)->mode_config.plane_list, head) \
if ((plane_mask) & (1 << drm_plane_index(plane)))
If this is used in context:
if (condition)
drm_for_each_plane_mask(plane, dev, plane_mask);
else
foo();
foo() will be called for each plane *not* in plane_mask, if condition
holds, and not at all if condition doesn't hold.
Fix this by reversing the conditions in the macros, and adding an else
branch for the "for each" block, so that other if/else blocks can't
interfere. Provide a "for_each_if" helper macro to make it easier to get
this right.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448392916-2281-1-git-send-email-jani.nikula@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
178 lines
6.3 KiB
C
178 lines
6.3 KiB
C
/*
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* Copyright (C) 2014 Red Hat
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* Copyright (C) 2014 Intel Corp.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rob Clark <robdclark@gmail.com>
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* Daniel Vetter <daniel.vetter@ffwll.ch>
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*/
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#ifndef DRM_ATOMIC_H_
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#define DRM_ATOMIC_H_
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#include <drm/drm_crtc.h>
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struct drm_atomic_state * __must_check
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drm_atomic_state_alloc(struct drm_device *dev);
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void drm_atomic_state_clear(struct drm_atomic_state *state);
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void drm_atomic_state_free(struct drm_atomic_state *state);
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int __must_check
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drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state);
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void drm_atomic_state_default_clear(struct drm_atomic_state *state);
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void drm_atomic_state_default_release(struct drm_atomic_state *state);
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struct drm_crtc_state * __must_check
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drm_atomic_get_crtc_state(struct drm_atomic_state *state,
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struct drm_crtc *crtc);
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int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
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struct drm_crtc_state *state, struct drm_property *property,
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uint64_t val);
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struct drm_plane_state * __must_check
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drm_atomic_get_plane_state(struct drm_atomic_state *state,
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struct drm_plane *plane);
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int drm_atomic_plane_set_property(struct drm_plane *plane,
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struct drm_plane_state *state, struct drm_property *property,
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uint64_t val);
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struct drm_connector_state * __must_check
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drm_atomic_get_connector_state(struct drm_atomic_state *state,
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struct drm_connector *connector);
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int drm_atomic_connector_set_property(struct drm_connector *connector,
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struct drm_connector_state *state, struct drm_property *property,
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uint64_t val);
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/**
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* drm_atomic_get_existing_crtc_state - get crtc state, if it exists
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* @state: global atomic state object
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* @crtc: crtc to grab
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*
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* This function returns the crtc state for the given crtc, or NULL
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* if the crtc is not part of the global atomic state.
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*/
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static inline struct drm_crtc_state *
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drm_atomic_get_existing_crtc_state(struct drm_atomic_state *state,
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struct drm_crtc *crtc)
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{
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return state->crtc_states[drm_crtc_index(crtc)];
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}
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/**
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* drm_atomic_get_existing_plane_state - get plane state, if it exists
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* @state: global atomic state object
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* @plane: plane to grab
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*
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* This function returns the plane state for the given plane, or NULL
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* if the plane is not part of the global atomic state.
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*/
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static inline struct drm_plane_state *
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drm_atomic_get_existing_plane_state(struct drm_atomic_state *state,
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struct drm_plane *plane)
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{
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return state->plane_states[drm_plane_index(plane)];
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}
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/**
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* drm_atomic_get_existing_connector_state - get connector state, if it exists
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* @state: global atomic state object
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* @connector: connector to grab
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*
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* This function returns the connector state for the given connector,
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* or NULL if the connector is not part of the global atomic state.
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*/
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static inline struct drm_connector_state *
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drm_atomic_get_existing_connector_state(struct drm_atomic_state *state,
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struct drm_connector *connector)
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{
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int index = drm_connector_index(connector);
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if (index >= state->num_connector)
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return NULL;
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return state->connector_states[index];
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}
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int __must_check
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drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
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struct drm_display_mode *mode);
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int __must_check
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drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
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struct drm_property_blob *blob);
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int __must_check
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drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
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struct drm_crtc *crtc);
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void drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
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struct drm_framebuffer *fb);
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int __must_check
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drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
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struct drm_crtc *crtc);
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int __must_check
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drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
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struct drm_crtc *crtc);
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int __must_check
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drm_atomic_add_affected_planes(struct drm_atomic_state *state,
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struct drm_crtc *crtc);
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int
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drm_atomic_connectors_for_crtc(struct drm_atomic_state *state,
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struct drm_crtc *crtc);
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void drm_atomic_legacy_backoff(struct drm_atomic_state *state);
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void
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drm_atomic_clean_old_fb(struct drm_device *dev, unsigned plane_mask, int ret);
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int __must_check drm_atomic_check_only(struct drm_atomic_state *state);
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int __must_check drm_atomic_commit(struct drm_atomic_state *state);
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int __must_check drm_atomic_async_commit(struct drm_atomic_state *state);
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#define for_each_connector_in_state(state, connector, connector_state, __i) \
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for ((__i) = 0; \
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(__i) < (state)->num_connector && \
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((connector) = (state)->connectors[__i], \
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(connector_state) = (state)->connector_states[__i], 1); \
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(__i)++) \
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for_each_if (connector)
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#define for_each_crtc_in_state(state, crtc, crtc_state, __i) \
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for ((__i) = 0; \
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(__i) < (state)->dev->mode_config.num_crtc && \
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((crtc) = (state)->crtcs[__i], \
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(crtc_state) = (state)->crtc_states[__i], 1); \
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(__i)++) \
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for_each_if (crtc_state)
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#define for_each_plane_in_state(state, plane, plane_state, __i) \
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for ((__i) = 0; \
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(__i) < (state)->dev->mode_config.num_total_plane && \
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((plane) = (state)->planes[__i], \
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(plane_state) = (state)->plane_states[__i], 1); \
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(__i)++) \
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for_each_if (plane_state)
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static inline bool
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drm_atomic_crtc_needs_modeset(struct drm_crtc_state *state)
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{
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return state->mode_changed || state->active_changed ||
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state->connectors_changed;
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}
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#endif /* DRM_ATOMIC_H_ */
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