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>

6 files changed, 18 insertions, 17 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 4c68f76993d8..bdd0d903872a 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/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;
         }
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ae1718549eec..ec8336a4b7de 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/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;
diff --git a/drivers/gpu/drm/i915/intel_fb.c b/drivers/gpu/drm/i915/intel_fb.c
index 3e18c9e7729b..1d2d67ce4a84 100644
--- a/drivers/gpu/drm/i915/intel_fb.c
+++ b/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;
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 74e6b4ed12c0..2e11fd65b4dd 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/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;
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index d49a14891f83..6130ec9ed502 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/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);
 
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 437ac786277a..64d7f47df868 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/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 @@ try_dmabuf:
         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 @@ try_dmabuf:
 
         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 @@ err_not_scanout:
         /* 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 = {