drm: Propagate error code from fb_create()

Change the interface to expect a PTR_ERR specifing the real error code
as opposed to assuming a NULL return => -EINVAL. Just once the user may
not be at fault!
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_crtc.c

@@ -1682,9 +1682,9 @@ int drm_mode_addfb(struct drm_device *dev,
 	/* TODO setup destructor callback */
 
 	fb = dev->mode_config.funcs->fb_create(dev, file_priv, r);
-	if (!fb) {
+	if (IS_ERR(fb)) {
 		DRM_ERROR("could not create framebuffer\n");
-		ret = -EINVAL;
+		ret = PTR_ERR(fb);
 		goto out;
 	}
 

drivers/gpu/drm/i915/intel_display.c

@@ -5312,18 +5312,18 @@ intel_user_framebuffer_create(struct drm_device *dev,
 
 	obj = drm_gem_object_lookup(dev, filp, mode_cmd->handle);
 	if (!obj)
-		return NULL;
+		return ERR_PTR(-ENOENT);
 
 	intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
 	if (!intel_fb)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	ret = intel_framebuffer_init(dev, intel_fb,
 				     mode_cmd, obj);
 	if (ret) {
 		drm_gem_object_unreference_unlocked(obj);
 		kfree(intel_fb);
-		return NULL;
+		return ERR_PTR(ret);
 	}
 
 	return &intel_fb->base;

drivers/gpu/drm/i915/intel_fb.c

@@ -119,7 +119,9 @@ static int intelfb_create(struct intel_fbdev *ifbdev,
 
 	info->par = ifbdev;
 
-	intel_framebuffer_init(dev, &ifbdev->ifb, &mode_cmd, fbo);
+	ret = intel_framebuffer_init(dev, &ifbdev->ifb, &mode_cmd, fbo);
+	if (ret)
+		goto out_unpin;
 
 	fb = &ifbdev->ifb.base;
 

drivers/gpu/drm/nouveau/nouveau_display.c

@@ -84,16 +84,16 @@ nouveau_user_framebuffer_create(struct drm_device *dev,
 
 	gem = drm_gem_object_lookup(dev, file_priv, mode_cmd->handle);
 	if (!gem)
-		return NULL;
+		return ERR_PTR(-ENOENT);
 
 	nouveau_fb = kzalloc(sizeof(struct nouveau_framebuffer), GFP_KERNEL);
 	if (!nouveau_fb)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	ret = nouveau_framebuffer_init(dev, nouveau_fb, mode_cmd, nouveau_gem_object(gem));
 	if (ret) {
 		drm_gem_object_unreference(gem);
-		return NULL;
+		return ERR_PTR(ret);
 	}
 
 	return &nouveau_fb->base;

drivers/gpu/drm/radeon/radeon_display.c

@@ -888,13 +888,12 @@ radeon_user_framebuffer_create(struct drm_device *dev,
 	if (obj ==  NULL) {
 		dev_err(&dev->pdev->dev, "No GEM object associated to handle 0x%08X, "
 			"can't create framebuffer\n", mode_cmd->handle);
-		return NULL;
+		return ERR_PTR(-ENOENT);
 	}
 
 	radeon_fb = kzalloc(sizeof(*radeon_fb), GFP_KERNEL);
-	if (radeon_fb == NULL) {
-		return NULL;
-	}
+	if (radeon_fb == NULL)
+		return ERR_PTR(-ENOMEM);
 
 	radeon_framebuffer_init(dev, radeon_fb, mode_cmd, obj);
 

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -737,7 +737,7 @@ static struct drm_framebuffer *vmw_kms_fb_create(struct drm_device *dev,
 
 	if (ret) {
 		DRM_ERROR("failed to create vmw_framebuffer: %i\n", ret);
-		return NULL;
+		return ERR_PTR(ret);
 	}
 	return &vfb->base;
 
@@ -747,7 +747,7 @@ static struct drm_framebuffer *vmw_kms_fb_create(struct drm_device *dev,
 	ret = vmw_user_dmabuf_lookup(tfile, mode_cmd->handle, &bo);
 	if (ret) {
 		DRM_ERROR("failed to find buffer: %i\n", ret);
-		return NULL;
+		return ERR_PTR(-ENOENT);
 	}
 
 	ret = vmw_kms_new_framebuffer_dmabuf(dev_priv, bo, &vfb,
@@ -758,7 +758,7 @@ static struct drm_framebuffer *vmw_kms_fb_create(struct drm_device *dev,
 
 	if (ret) {
 		DRM_ERROR("failed to create vmw_framebuffer: %i\n", ret);
-		return NULL;
+		return ERR_PTR(ret);
 	}
 
 	return &vfb->base;
@@ -768,7 +768,7 @@ static struct drm_framebuffer *vmw_kms_fb_create(struct drm_device *dev,
 	/* vmw_user_surface_lookup takes one ref */
 	vmw_surface_unreference(&surface);
 
-	return NULL;
+	return ERR_PTR(-EINVAL);
 }
 
 static struct drm_mode_config_funcs vmw_kms_funcs = {