drm/meson: fix canvas release in bind function

Allocated canvases may not be released on the error exit path of
meson_drv_bind_master(), leading to resource leaking. Rewrite exit path
to release canvases on error.

Fixes: 2bf6b5b0 ("drm/meson: exclusively use the canvas provider module")
Signed-off-by: Yao Zi <ziyao@disroot.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240703155826.10385-2-ziyao@disroot.orgSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240703155826.10385-2-ziyao@disroot.org

drivers/gpu/drm/meson/meson_drv.c

@@ -250,29 +250,20 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 	if (ret)
 		goto free_drm;
 	ret = meson_canvas_alloc(priv->canvas, &priv->canvas_id_vd1_0);
-	if (ret) {
-		meson_canvas_free(priv->canvas, priv->canvas_id_osd1);
-		goto free_drm;
-	}
+	if (ret)
+		goto free_canvas_osd1;
 	ret = meson_canvas_alloc(priv->canvas, &priv->canvas_id_vd1_1);
-	if (ret) {
-		meson_canvas_free(priv->canvas, priv->canvas_id_osd1);
-		meson_canvas_free(priv->canvas, priv->canvas_id_vd1_0);
-		goto free_drm;
-	}
+	if (ret)
+		goto free_canvas_vd1_0;
 	ret = meson_canvas_alloc(priv->canvas, &priv->canvas_id_vd1_2);
-	if (ret) {
-		meson_canvas_free(priv->canvas, priv->canvas_id_osd1);
-		meson_canvas_free(priv->canvas, priv->canvas_id_vd1_0);
-		meson_canvas_free(priv->canvas, priv->canvas_id_vd1_1);
-		goto free_drm;
-	}
+	if (ret)
+		goto free_canvas_vd1_1;
 
 	priv->vsync_irq = platform_get_irq(pdev, 0);
 
 	ret = drm_vblank_init(drm, 1);
 	if (ret)
-		goto free_drm;
+		goto free_canvas_vd1_2;
 
 	/* Assign limits per soc revision/package */
 	for (i = 0 ; i < ARRAY_SIZE(meson_drm_soc_attrs) ; ++i) {
@@ -288,11 +279,11 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 	 */
 	ret = drm_aperture_remove_framebuffers(&meson_driver);
 	if (ret)
-		goto free_drm;
+		goto free_canvas_vd1_2;
 
 	ret = drmm_mode_config_init(drm);
 	if (ret)
-		goto free_drm;
+		goto free_canvas_vd1_2;
 	drm->mode_config.max_width = 3840;
 	drm->mode_config.max_height = 2160;
 	drm->mode_config.funcs = &meson_mode_config_funcs;
@@ -307,7 +298,7 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 	if (priv->afbcd.ops) {
 		ret = priv->afbcd.ops->init(priv);
 		if (ret)
-			goto free_drm;
+			goto free_canvas_vd1_2;
 	}
 
 	/* Encoder Initialization */
@@ -371,6 +362,14 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 exit_afbcd:
 	if (priv->afbcd.ops)
 		priv->afbcd.ops->exit(priv);
+free_canvas_vd1_2:
+	meson_canvas_free(priv->canvas, priv->canvas_id_vd1_2);
+free_canvas_vd1_1:
+	meson_canvas_free(priv->canvas, priv->canvas_id_vd1_1);
+free_canvas_vd1_0:
+	meson_canvas_free(priv->canvas, priv->canvas_id_vd1_0);
+free_canvas_osd1:
+	meson_canvas_free(priv->canvas, priv->canvas_id_osd1);
 free_drm:
 	drm_dev_put(drm);