Hello Paul Cercueil,
The patch fc1acf317b01: "drm/ingenic: Add support for the IPU" from
Jul 16, 2020, leads to the following static checker warning:
drivers/gpu/drm/ingenic/ingenic-drm-drv.c:232 ingenic_drm_crtc_atomic_check()
error: potentially dereferencing uninitialized 'ipu_state'.
drivers/gpu/drm/ingenic/ingenic-drm-drv.c
197 static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
198 struct drm_crtc_state *state)
199 {
200 struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
201 struct drm_plane_state *f1_state, *f0_state, *ipu_state;
202 long rate;
203
204 if (!drm_atomic_crtc_needs_modeset(state))
205 return 0;
206
207 if (state->mode.hdisplay > priv->soc_info->max_width ||
208 state->mode.vdisplay > priv->soc_info->max_height)
209 return -EINVAL;
210
211 rate = clk_round_rate(priv->pix_clk,
212 state->adjusted_mode.clock * 1000);
213 if (rate < 0)
214 return rate;
215
216 if (priv->soc_info->has_osd) {
217 f1_state = drm_atomic_get_plane_state(state->state, &priv->f1);
218 f0_state = drm_atomic_get_plane_state(state->state, &priv->f0);
219
220 if (IS_ENABLED(CONFIG_DRM_INGENIC_IPU) && priv->ipu_plane) {
Do we need to check both the CONFIG and the priv->ipu_plane or would it
be sufficient to just check if (priv->ipu_plane) {?
221 ipu_state = drm_atomic_get_plane_state(state->state, priv->ipu_plane);
222
223 /* IPU and F1 planes cannot be enabled at the same time. */
224 if (f1_state->fb && ipu_state->fb) {
225 dev_dbg(priv->dev, "Cannot enable both F1 and IPU\n");
226 return -EINVAL;
227 }
228 }
229
230 /* If all the planes are disabled, we won't get a VBLANK IRQ */
231 priv->no_vblank = !f1_state->fb && !f0_state->fb &&
232 !(priv->ipu_plane && ipu_state->fb);
^^^^^^^^^^^^^^^
Because here we're only checking "priv->ipu_plane".
233 }
234
235 return 0;
236 }
regards,
dan carpenter
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