This reverts commit a7442b93cf32c1e1ddb721a26cd1f92302e2a222. With the patch applied SNB, IVB and ILK are experiencing hard machine hangs. Original patch was to fix "just" kernel panics so it's not a good trade-off. Proper fix for the panic is on the way, lets revert until then. Fixes: a7442b93cf32 ("drm/i915: Fix races on fbdev") Cc: Lukas Wunner <lukas@xxxxxxxxx> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Tomi Sarvela <tomi.p.sarvela@xxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Acked-by: Lukas Wunner <lukas@xxxxxxxxx> Tested-by: Tomi Sarvela <tomi.p.sarvela@xxxxxxxxx> Suggested-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/i915_dma.c | 8 +++++--- drivers/gpu/drm/i915/intel_fbdev.c | 3 --- 2 files changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index a66ce49..b377753 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -493,9 +493,11 @@ static int i915_load_modeset_init(struct drm_device *dev) * Some ports require correctly set-up hpd registers for detection to * work properly (leading to ghost connected connector status), e.g. VGA * on gm45. Hence we can only set up the initial fbdev config after hpd - * irqs are fully enabled. We protect the fbdev initial config scanning - * against hotplug events by waiting in intel_fbdev_output_poll_changed - * until the asynchronous thread has finished. + * irqs are fully enabled. Now we should scan for the initial config + * only once hotplug handling is enabled, but due to screwed-up locking + * around kms/fbdev init we can't protect the fdbev initial config + * scanning against hotplug events. Hence do this first and ignore the + * tiny window where we will loose hotplug notifactions. */ intel_fbdev_initial_config_async(dev); diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c index 4cf04ce..79ac202 100644 --- a/drivers/gpu/drm/i915/intel_fbdev.c +++ b/drivers/gpu/drm/i915/intel_fbdev.c @@ -810,8 +810,6 @@ void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous void intel_fbdev_output_poll_changed(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; - - async_synchronize_full(); if (dev_priv->fbdev) drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper); } @@ -823,7 +821,6 @@ void intel_fbdev_restore_mode(struct drm_device *dev) struct intel_fbdev *ifbdev = dev_priv->fbdev; struct drm_fb_helper *fb_helper; - async_synchronize_full(); if (!ifbdev) return; -- 2.5.5 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx