From 366e39b4d2c53b198b072f984caa0ebc4220ad4d Mon Sep 17 00:00:00 2001 From: Lukas Wunner Date: Wed, 18 Nov 2015 16:29:51 +0100 Subject: [PATCH] drm/i915: Tear down fbdev if initialization fails MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Currently if intelfb_create() errors out, it unrefs the bo even though the fb now owns that reference. (Spotted by Ville Syrjälä.) We should unref the fb instead of the bo. However the fb was not necessarily allocated by intelfb_create(), it could be inherited from BIOS (the fb struct was then allocated by dev_priv->display.get_initial_plane_config()) and be in active use by a crtc. In this case we should call drm_framebuffer_remove() instead of _unreference() to also disable the crtc. Daniel Vetter suggested that "fbdev teardown code will take care of it. The correct approach is probably to not unref anything at all". But if fbdev initialization fails, the fbdev isn't torn down and occupies memory even though it's unusable. Therefore clobber it in intel_fbdev_initial_config(). (Currently we ignore a negative return value there.) The idea is that if fbdev initialization fails, the driver behaves as if CONFIG_DRM_FBDEV_EMULATION wasn't set. Should X11 manage to start up without errors, it will at least be able to use the memory that would otherwise be hogged by the unusable fbdev. Also, log errors in intelfb_create(). Don't call async_synchronize_full() in intel_fbdev_fini() when called from intel_fbdev_initial_config() to avoid deadlock. v2: Instead of calling drm_framebuffer_unreference() (if fb was not inherited from BIOS), call intel_fbdev_fini(). v3: Rebase on e00bf69644ba (drm/i915: Move the fbdev async_schedule() into intel_fbdev.c), call async_synchronize_full() conditionally instead of moving it into i915_driver_unload(). Cc: Daniel Vetter Signed-off-by: Lukas Wunner Link: http://patchwork.freedesktop.org/patch/msgid/49ce5f0daead24b7598ec78591731046c333c18d.1447938059.git.lukas@wunner.de Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_fbdev.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c index cdbef32897f0..7ccde58f8c98 100644 --- a/drivers/gpu/drm/i915/intel_fbdev.c +++ b/drivers/gpu/drm/i915/intel_fbdev.c @@ -227,6 +227,7 @@ static int intelfb_create(struct drm_fb_helper *helper, info = drm_fb_helper_alloc_fbi(helper); if (IS_ERR(info)) { + DRM_ERROR("Failed to allocate fb_info\n"); ret = PTR_ERR(info); goto out_unpin; } @@ -253,6 +254,7 @@ static int intelfb_create(struct drm_fb_helper *helper, ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj), size); if (!info->screen_base) { + DRM_ERROR("Failed to remap framebuffer into virtual memory\n"); ret = -ENOSPC; goto out_destroy_fbi; } @@ -285,7 +287,6 @@ out_destroy_fbi: drm_fb_helper_release_fbi(helper); out_unpin: i915_gem_object_ggtt_unpin(obj); - drm_gem_object_unreference(&obj->base); mutex_unlock(&dev->struct_mutex); return ret; } @@ -713,7 +714,9 @@ static void intel_fbdev_initial_config(void *data, async_cookie_t cookie) struct intel_fbdev *ifbdev = dev_priv->fbdev; /* Due to peculiar init order wrt to hpd handling this is separate. */ - drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp); + if (drm_fb_helper_initial_config(&ifbdev->helper, + ifbdev->preferred_bpp)) + intel_fbdev_fini(dev_priv->dev); } void intel_fbdev_initial_config_async(struct drm_device *dev) @@ -729,7 +732,8 @@ void intel_fbdev_fini(struct drm_device *dev) flush_work(&dev_priv->fbdev_suspend_work); - async_synchronize_full(); + if (!current_is_async()) + async_synchronize_full(); intel_fbdev_destroy(dev, dev_priv->fbdev); kfree(dev_priv->fbdev); dev_priv->fbdev = NULL; -- 2.20.1