diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2015-11-24 21:21:55 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-11-25 09:29:21 +0100 |
| commit | 373701b1fc7d7c0013ae4fffd8103615c150751e (patch) | |
| tree | 8ac8879cb421dd4ae80cb9a7bc377e222e2d91df /include/drm/drm_crtc.h | |
| parent | ed293f7754934b26c6f3db0dbc39ec2ed990f286 (diff) | |
| download | lwn-373701b1fc7d7c0013ae4fffd8103615c150751e.tar.gz lwn-373701b1fc7d7c0013ae4fffd8103615c150751e.zip | |
drm: fix potential dangling else problems in for_each_ macros
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>
Diffstat (limited to 'include/drm/drm_crtc.h')
| -rw-r--r-- | include/drm/drm_crtc.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 173535a35d65..4765df331002 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1170,7 +1170,7 @@ struct drm_mode_config { */ #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))) + for_each_if ((plane_mask) & (1 << drm_plane_index(plane))) #define obj_to_crtc(x) container_of(x, struct drm_crtc, base) @@ -1547,7 +1547,7 @@ static inline struct drm_property *drm_property_find(struct drm_device *dev, /* Plane list iterator for legacy (overlay only) planes. */ #define drm_for_each_legacy_plane(plane, dev) \ list_for_each_entry(plane, &(dev)->mode_config.plane_list, head) \ - if (plane->type == DRM_PLANE_TYPE_OVERLAY) + for_each_if (plane->type == DRM_PLANE_TYPE_OVERLAY) #define drm_for_each_plane(plane, dev) \ list_for_each_entry(plane, &(dev)->mode_config.plane_list, head) |