From 27892bbdc9233f33bf0f44e08aab8f12e0dec142 Mon Sep 17 00:00:00 2001 From: Clint Taylor Date: Wed, 18 Jan 2017 13:38:43 -0800 Subject: [PATCH] drm/i915: prevent crash with .disable_display parameter The .disable_display parameter was causing a fatal crash when fbdev was dereferenced during driver init. V1: protection in i915_drv.c V2: Moved protection to intel_fbdev.c Fixes: 43cee314345a ("drm/i915/fbdev: Limit the global async-domain synchronization") Testcase: igt/drv_module_reload/basic-no-display Cc: Chris Wilson Signed-off-by: Clint Taylor Link: http://patchwork.freedesktop.org/patch/msgid/1484775523-29428-1-git-send-email-clinton.a.taylor@intel.com Reviewed-by: Chris Wilson Cc: Lukas Wunner Cc: Daniel Vetter Cc: Jani Nikula Cc: # v4.8+ Signed-off-by: Chris Wilson (cherry picked from commit 5b8cd0755f8a06a851c436a013e7be0823fb155a) Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/intel_fbdev.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c index beb0898..8cf2d80 100644 --- a/drivers/gpu/drm/i915/intel_fbdev.c +++ b/drivers/gpu/drm/i915/intel_fbdev.c @@ -742,6 +742,9 @@ void intel_fbdev_initial_config_async(struct drm_device *dev) { struct intel_fbdev *ifbdev = to_i915(dev)->fbdev; + if (!ifbdev) + return; + ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev); } -- 2.7.4