drm/fb-helper: Propagate errors from initial config failure

Make drm_fb_helper_initial_config() return an int rather than a bool so
that the error can be properly propagated. While at it, update drivers
to propagate errors further rather than just ignore them.

v2:
- cirrus: No cleanup is required, the top-level cirrus_driver_load()
  will do it as part of cirrus_driver_unload() in its cleanup path.
  Reported-by: Fengguang Wu <fengguang.wu@intel.com>

Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
[danvet: Squash in simplification patch from kbuild.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

13 files changed, 140 insertions, 51 deletions

diff --git a/drivers/gpu/drm/ast/ast_fb.c b/drivers/gpu/drm/ast/ast_fb.c
index 5c60ae524c45..ff68eefae273 100644
--- a/drivers/gpu/drm/ast/ast_fb.c
+++ b/drivers/gpu/drm/ast/ast_fb.c
@@ -335,18 +335,27 @@ int ast_fbdev_init(struct drm_device *dev)
 
         ret = drm_fb_helper_init(dev, &afbdev->helper,
                                  1, 1);
-        if (ret) {
-                kfree(afbdev);
-                return ret;
-        }
+        if (ret)
+                goto free;
 
-        drm_fb_helper_single_add_all_connectors(&afbdev->helper);
+        ret = drm_fb_helper_single_add_all_connectors(&afbdev->helper);
+        if (ret)
+                goto fini;
 
         /* disable all the possible outputs/crtcs before entering KMS mode */
         drm_helper_disable_unused_functions(dev);
 
-        drm_fb_helper_initial_config(&afbdev->helper, 32);
+        ret = drm_fb_helper_initial_config(&afbdev->helper, 32);
+        if (ret)
+                goto fini;
+
         return 0;
+
+fini:
+        drm_fb_helper_fini(&afbdev->helper);
+free:
+        kfree(afbdev);
+        return ret;
 }
 
 void ast_fbdev_fini(struct drm_device *dev)
diff --git a/drivers/gpu/drm/bochs/bochs_fbdev.c b/drivers/gpu/drm/bochs/bochs_fbdev.c
index 61dbf09dff5d..976d9798dc99 100644
--- a/drivers/gpu/drm/bochs/bochs_fbdev.c
+++ b/drivers/gpu/drm/bochs/bochs_fbdev.c
@@ -207,12 +207,22 @@ int bochs_fbdev_init(struct bochs_device *bochs)
         if (ret)
                 return ret;
 
-        drm_fb_helper_single_add_all_connectors(&bochs->fb.helper);
+        ret = drm_fb_helper_single_add_all_connectors(&bochs->fb.helper);
+        if (ret)
+                goto fini;
+
         drm_helper_disable_unused_functions(bochs->dev);
-        drm_fb_helper_initial_config(&bochs->fb.helper, 32);
+
+        ret = drm_fb_helper_initial_config(&bochs->fb.helper, 32);
+        if (ret)
+                goto fini;
 
         bochs->fb.initialized = true;
         return 0;
+
+fini:
+        drm_fb_helper_fini(&bochs->fb.helper);
+        return ret;
 }
 
 void bochs_fbdev_fini(struct bochs_device *bochs)
diff --git a/drivers/gpu/drm/cirrus/cirrus_fbdev.c b/drivers/gpu/drm/cirrus/cirrus_fbdev.c
index 502a89eb54b5..13ddf1c4bb8e 100644
--- a/drivers/gpu/drm/cirrus/cirrus_fbdev.c
+++ b/drivers/gpu/drm/cirrus/cirrus_fbdev.c
@@ -317,17 +317,17 @@ int cirrus_fbdev_init(struct cirrus_device *cdev)
 
         ret = drm_fb_helper_init(cdev->dev, &gfbdev->helper,
                                  cdev->num_crtc, CIRRUSFB_CONN_LIMIT);
-        if (ret) {
-                kfree(gfbdev);
+        if (ret)
+                return ret;
+
+        ret = drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
+        if (ret)
                 return ret;
-        }
-        drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
 
         /* disable all the possible outputs/crtcs before entering KMS mode */
         drm_helper_disable_unused_functions(cdev->dev);
-        drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);
 
-        return 0;
+        return drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);
 }
 
 void cirrus_fbdev_fini(struct cirrus_device *cdev)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 52ce26d6b4fb..876f1ef0acd1 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1688,7 +1688,7 @@ out:
  * RETURNS:
  * Zero if everything went ok, nonzero otherwise.
  */
-bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
+int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
 {
         struct drm_device *dev = fb_helper->dev;
         int count = 0;
diff --git a/drivers/gpu/drm/gma500/framebuffer.c b/drivers/gpu/drm/gma500/framebuffer.c
index ddd90ddbc200..2d42ce6d3757 100644
--- a/drivers/gpu/drm/gma500/framebuffer.c
+++ b/drivers/gpu/drm/gma500/framebuffer.c
@@ -593,6 +593,7 @@ int psb_fbdev_init(struct drm_device *dev)
 {
         struct psb_fbdev *fbdev;
         struct drm_psb_private *dev_priv = dev->dev_private;
+        int ret;
 
         fbdev = kzalloc(sizeof(struct psb_fbdev), GFP_KERNEL);
         if (!fbdev) {
@@ -604,16 +605,29 @@ int psb_fbdev_init(struct drm_device *dev)
 
         drm_fb_helper_prepare(dev, &fbdev->psb_fb_helper, &psb_fb_helper_funcs);
 
-        drm_fb_helper_init(dev, &fbdev->psb_fb_helper, dev_priv->ops->crtcs,
-                                                        INTELFB_CONN_LIMIT);
+        ret = drm_fb_helper_init(dev, &fbdev->psb_fb_helper,
+                                 dev_priv->ops->crtcs, INTELFB_CONN_LIMIT);
+        if (ret)
+                goto free;
 
-        drm_fb_helper_single_add_all_connectors(&fbdev->psb_fb_helper);
+        ret = drm_fb_helper_single_add_all_connectors(&fbdev->psb_fb_helper);
+        if (ret)
+                goto fini;
 
         /* disable all the possible outputs/crtcs before entering KMS mode */
         drm_helper_disable_unused_functions(dev);
 
-        drm_fb_helper_initial_config(&fbdev->psb_fb_helper, 32);
+        ret = drm_fb_helper_initial_config(&fbdev->psb_fb_helper, 32);
+        if (ret)
+                goto fini;
+
         return 0;
+
+fini:
+        drm_fb_helper_fini(&fbdev->psb_fb_helper);
+free:
+        kfree(fbdev);
+        return ret;
 }
 
 static void psb_fbdev_fini(struct drm_device *dev)
diff --git a/drivers/gpu/drm/mgag200/mgag200_fb.c b/drivers/gpu/drm/mgag200/mgag200_fb.c
index 4415af3666ab..c36b8304042b 100644
--- a/drivers/gpu/drm/mgag200/mgag200_fb.c
+++ b/drivers/gpu/drm/mgag200/mgag200_fb.c
@@ -303,14 +303,22 @@ int mgag200_fbdev_init(struct mga_device *mdev)
         if (ret)
                 return ret;
 
-        drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
+        ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
+        if (ret)
+                goto fini;
 
         /* disable all the possible outputs/crtcs before entering KMS mode */
         drm_helper_disable_unused_functions(mdev->dev);
 
-        drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
+        ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
+        if (ret)
+                goto fini;
 
         return 0;
+
+fini:
+        drm_fb_helper_fini(&mfbdev->helper);
+        return ret;
 }
 
 void mgag200_fbdev_fini(struct mga_device *mdev)
diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c
index 1f3af13ccede..115b509a4a00 100644
--- a/drivers/gpu/drm/msm/msm_fbdev.c
+++ b/drivers/gpu/drm/msm/msm_fbdev.c
@@ -241,17 +241,23 @@ struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
                 goto fail;
         }
 
-        drm_fb_helper_single_add_all_connectors(helper);
+        ret = drm_fb_helper_single_add_all_connectors(helper);
+        if (ret)
+                goto fini;
 
         /* disable all the possible outputs/crtcs before entering KMS mode */
         drm_helper_disable_unused_functions(dev);
 
-        drm_fb_helper_initial_config(helper, 32);
+        ret = drm_fb_helper_initial_config(helper, 32);
+        if (ret)
+                goto fini;
 
         priv->fbdev = helper;
 
         return helper;
 
+fini:
+        drm_fb_helper_fini(helper);
 fail:
         kfree(fbdev);
         return NULL;
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index 3ed12a8cfc91..5a7705dcd67e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -539,12 +539,12 @@ nouveau_fbcon_init(struct drm_device *dev)
 
         ret = drm_fb_helper_init(dev, &fbcon->helper,
                                  dev->mode_config.num_crtc, 4);
-        if (ret) {
-                kfree(fbcon);
-                return ret;
-        }
+        if (ret)
+                goto free;
 
-        drm_fb_helper_single_add_all_connectors(&fbcon->helper);
+        ret = drm_fb_helper_single_add_all_connectors(&fbcon->helper);
+        if (ret)
+                goto fini;
 
         if (drm->device.info.ram_size <= 32 * 1024 * 1024)
                 preferred_bpp = 8;
@@ -557,8 +557,17 @@ nouveau_fbcon_init(struct drm_device *dev)
         /* disable all the possible outputs/crtcs before entering KMS mode */
         drm_helper_disable_unused_functions(dev);
 
-        drm_fb_helper_initial_config(&fbcon->helper, preferred_bpp);
+        ret = drm_fb_helper_initial_config(&fbcon->helper, preferred_bpp);
+        if (ret)
+                goto fini;
+
         return 0;
+
+fini:
+        drm_fb_helper_fini(&fbcon->helper);
+free:
+        kfree(fbcon);
+        return ret;
 }
 
 void
diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c
index 8436c6857cda..d292d24b3a6e 100644
--- a/drivers/gpu/drm/omapdrm/omap_fbdev.c
+++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
@@ -334,17 +334,23 @@ struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
                 goto fail;
         }
 
-        drm_fb_helper_single_add_all_connectors(helper);
+        ret = drm_fb_helper_single_add_all_connectors(helper);
+        if (ret)
+                goto fini;
 
         /* disable all the possible outputs/crtcs before entering KMS mode */
         drm_helper_disable_unused_functions(dev);
 
-        drm_fb_helper_initial_config(helper, 32);
+        ret = drm_fb_helper_initial_config(helper, 32);
+        if (ret)
+                goto fini;
 
         priv->fbdev = helper;
 
         return helper;
 
+fini:
+        drm_fb_helper_fini(helper);
 fail:
         kfree(fbdev);
         return NULL;
diff --git a/drivers/gpu/drm/qxl/qxl_fb.c b/drivers/gpu/drm/qxl/qxl_fb.c
index 3d7c1d00a424..f778c0e8ae3c 100644
--- a/drivers/gpu/drm/qxl/qxl_fb.c
+++ b/drivers/gpu/drm/qxl/qxl_fb.c
@@ -686,14 +686,24 @@ int qxl_fbdev_init(struct qxl_device *qdev)
         ret = drm_fb_helper_init(qdev->ddev, &qfbdev->helper,
                                  qxl_num_crtc /* num_crtc - QXL supports just 1 */,
                                  QXLFB_CONN_LIMIT);
-        if (ret) {
-                kfree(qfbdev);
-                return ret;
-        }
+        if (ret)
+                goto free;
+
+        ret = drm_fb_helper_single_add_all_connectors(&qfbdev->helper);
+        if (ret)
+                goto fini;
+
+        ret = drm_fb_helper_initial_config(&qfbdev->helper, bpp_sel);
+        if (ret)
+                goto fini;
 
-        drm_fb_helper_single_add_all_connectors(&qfbdev->helper);
-        drm_fb_helper_initial_config(&qfbdev->helper, bpp_sel);
         return 0;
+
+fini:
+        drm_fb_helper_fini(&qfbdev->helper);
+free:
+        kfree(qfbdev);
+        return ret;
 }
 
 void qxl_fbdev_fini(struct qxl_device *qdev)
diff --git a/drivers/gpu/drm/radeon/radeon_fb.c b/drivers/gpu/drm/radeon/radeon_fb.c
index 29b9220ec399..3000bc4c136b 100644
--- a/drivers/gpu/drm/radeon/radeon_fb.c
+++ b/drivers/gpu/drm/radeon/radeon_fb.c
@@ -390,18 +390,27 @@ int radeon_fbdev_init(struct radeon_device *rdev)
         ret = drm_fb_helper_init(rdev->ddev, &rfbdev->helper,
                                  rdev->num_crtc,
                                  RADEONFB_CONN_LIMIT);
-        if (ret) {
-                kfree(rfbdev);
-                return ret;
-        }
+        if (ret)
+                goto free;
 
-        drm_fb_helper_single_add_all_connectors(&rfbdev->helper);
+        ret = drm_fb_helper_single_add_all_connectors(&rfbdev->helper);
+        if (ret)
+                goto fini;
 
         /* disable all the possible outputs/crtcs before entering KMS mode */
         drm_helper_disable_unused_functions(rdev->ddev);
 
-        drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel);
+        ret = drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel);
+        if (ret)
+                goto fini;
+
         return 0;
+
+fini:
+        drm_fb_helper_fini(&rfbdev->helper);
+free:
+        kfree(rfbdev);
+        return ret;
 }
 
 void radeon_fbdev_fini(struct radeon_device *rdev)
diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index 8cbcb4589bd3..5fc16cecd3ba 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -589,19 +589,27 @@ int udl_fbdev_init(struct drm_device *dev)
 
         ret = drm_fb_helper_init(dev, &ufbdev->helper,
                                  1, 1);
-        if (ret) {
-                kfree(ufbdev);
-                return ret;
-
-        }
+        if (ret)
+                goto free;
 
-        drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
+        ret = drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
+        if (ret)
+                goto fini;
 
         /* disable all the possible outputs/crtcs before entering KMS mode */
         drm_helper_disable_unused_functions(dev);
 
-        drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
+        ret = drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
+        if (ret)
+                goto fini;
+
         return 0;
+
+fini:
+        drm_fb_helper_fini(&ufbdev->helper);
+free:
+        kfree(ufbdev);
+        return ret;
 }
 
 void udl_fbdev_cleanup(struct drm_device *dev)
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index b597068103aa..21b944c456f6 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -125,7 +125,7 @@ void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 
 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
-bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
+int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
 int drm_fb_helper_debug_enter(struct fb_info *info);
 int drm_fb_helper_debug_leave(struct fb_info *info);