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Revert "drm/i915: Fix races on fbdev"

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This reverts commit a7442b93cf.

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: a7442b93cf ("drm/i915: Fix races on fbdev")
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tomi Sarvela <tomi.p.sarvela@intel.com>
Cc: stable@vger.kernel.org
Acked-by: Lukas Wunner <lukas@wunner.de>
Tested-by: Tomi Sarvela <tomi.p.sarvela@intel.com>
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459510861-29035-1-git-send-email-joonas.lahtinen@linux.intel.com
This commit is contained in:
Joonas Lahtinen 2016-04-01 14:41:01 +03:00
parent e37788fdb2
commit 934458c2c9
2 changed files with 5 additions and 6 deletions
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8
drivers/gpu/drm/i915/i915_dma.c
View file

@ -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);

3
drivers/gpu/drm/i915/intel_fbdev.c
View file

@ -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;