Am 10.07.23 um 12:24 schrieb Sui Jingfeng:
Because smatch warnings:
drivers/gpu/drm/loongson/lsdc_plane.c:199
lsdc_cursor_plane_atomic_async_check()
warn: variable dereferenced before check 'state' (see line 180)
vim +/state +199 drivers/gpu/drm/loongson/lsdc_plane.c
174 static int
lsdc_cursor_plane_atomic_async_check(struct drm_plane *plane,
175 struct drm_atomic_state *state)
176 {
177 struct drm_plane_state *new_state;
178 struct drm_crtc_state *crtc_state;
179
180 new_state = drm_atomic_get_new_plane_state(state, plane);
^^^^^
state is dereferenced inside this function
181
182 if (!plane->state || !plane->state->fb) {
183 drm_dbg(plane->dev, "%s: state is NULL\n", plane->name);
184 return -EINVAL;
185 }
186
187 if (new_state->crtc_w != new_state->crtc_h) {
188 drm_dbg(plane->dev, "unsupported cursor size: %ux%u\n",
189 new_state->crtc_w, new_state->crtc_h);
190 return -EINVAL;
191 }
192
193 if (new_state->crtc_w != 64 && new_state->crtc_w != 32) {
194 drm_dbg(plane->dev, "unsupported cursor size: %ux%u\n",
195 new_state->crtc_w, new_state->crtc_h);
196 return -EINVAL;
197 }
198
199 if (state) {
^^^^^
Checked too late!
Reported-by: Dan Carpenter <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]/
Signed-off-by: Sui Jingfeng <[email protected]>
Acked-by: Thomas Zimmermann <[email protected]>BTW, you're posting these patches for loongson, but that driver is not yet in our tree?
Best regards Thomas
--- drivers/gpu/drm/loongson/lsdc_plane.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/drivers/gpu/drm/loongson/lsdc_plane.c b/drivers/gpu/drm/loongson/lsdc_plane.c index 2ab3db982aa3..0d5094633222 100644 --- a/drivers/gpu/drm/loongson/lsdc_plane.c +++ b/drivers/gpu/drm/loongson/lsdc_plane.c @@ -196,13 +196,7 @@ static int lsdc_cursor_plane_atomic_async_check(struct drm_plane *plane, return -EINVAL; }- if (state) {- crtc_state = drm_atomic_get_existing_crtc_state(state, new_state->crtc); - } else { - crtc_state = plane->crtc->state; - drm_dbg(plane->dev, "%s: atomic state is NULL\n", plane->name); - } - + crtc_state = drm_atomic_get_existing_crtc_state(state, new_state->crtc); if (!crtc_state->active) return -EINVAL;
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)
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