diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2022-02-18 12:03:42 +0200 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2022-03-14 17:36:59 +0200 |
| commit | 2d3eec8970335148278a6e350bc4840374f06471 (patch) | |
| tree | 3b7c51954ad57b43bca092091ce6493176f7fd1c /drivers/gpu/drm/drm_modes.c | |
| parent | b861de246912e10c5bda32cb100bff429a5e1ec4 (diff) | |
| download | lwn-2d3eec8970335148278a6e350bc4840374f06471.tar.gz lwn-2d3eec8970335148278a6e350bc4840374f06471.zip | |
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>
Diffstat (limited to 'drivers/gpu/drm/drm_modes.c')
| -rw-r--r-- | drivers/gpu/drm/drm_modes.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index 3f819c7a021b..6e7e10f16ec0 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -942,6 +942,23 @@ 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 * @mode: mode to duplicate |