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drm: Add drm_mode_init() 

Add a variant of drm_mode_copy() that explicitly clears out
the list head of the destination mode. Helpful to guarantee
we don't have stack garbage left in there for on-stack modes.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220218100403.7028-2-ville.syrjala@linux.intel.com
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
This commit is contained in:
Ville Syrjälä 2022-02-18 12:03:42 +02:00
parent b861de2469
commit 2d3eec8970
2 changed files with 19 additions and 0 deletions
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17
drivers/gpu/drm/drm_modes.c
View File

@ -941,6 +941,23 @@ void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *
}
EXPORT_SYMBOL(drm_mode_copy);
/**
* drm_mode_init - initialize the mode from another mode
* @dst: mode to overwrite
* @src: mode to copy
*
* Copy an existing mode into another mode, zeroing the
* list head of the destination mode. Typically used
* to guarantee the list head is not left with stack
* garbage in on-stack modes.
*/
void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
{
memset(dst, 0, sizeof(*dst));
drm_mode_copy(dst, src);
}
EXPORT_SYMBOL(drm_mode_init);
/**
* drm_mode_duplicate - allocate and duplicate an existing mode
* @dev: drm_device to allocate the duplicated mode for

2
include/drm/drm_modes.h
View File

@ -492,6 +492,8 @@ void drm_mode_set_crtcinfo(struct drm_display_mode *p,
int adjust_flags);
void drm_mode_copy(struct drm_display_mode *dst,
const struct drm_display_mode *src);
void drm_mode_init(struct drm_display_mode *dst,
const struct drm_display_mode *src);
struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
const struct drm_display_mode *mode);
bool drm_mode_match(const struct drm_display_mode *mode1,