From: Daniel Vetter Date: Wed, 24 Apr 2013 09:13:35 +0000 (+0200) Subject: drm/i915: disable interrupts earlier in the driver unload code X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fd0c06420d39958032655a04cfd194d5a7b38f83;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git drm/i915: disable interrupts earlier in the driver unload code Our rps code relies on the interrupts being off to prevent re-arming of the work items at inopportune moments. Also drop the redundant cancel_work for the main rps work, disable_gt_powersave already takes care of that. Finally add a WARN_ON to ensure we obey that piece of ordering constraint. Long term I want to lock down the setup/teardown code in a similar way to how we painstakingly check modeset sequence constraints already. v2: Disable polling after hpd handling is shut down - since Egbert's hpd irq storm handling the hotplug work can re-arm the polling handler. Spotted by Jani Nikula. Cc: Jesse Barnes Cc: Jani Nikula Reviewed-by: Jani Nikula Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 74156e231fd5..988e543ec45b 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -9530,12 +9530,23 @@ void intel_modeset_cleanup(struct drm_device *dev) struct drm_crtc *crtc; struct intel_crtc *intel_crtc; + /* + * Interrupts and polling as the first thing to avoid creating havoc. + * Too much stuff here (turning of rps, connectors, ...) would + * experience fancy races otherwise. + */ + drm_irq_uninstall(dev); + cancel_work_sync(&dev_priv->hotplug_work); + /* + * Due to the hpd irq storm handling the hotplug work can re-arm the + * poll handlers. Hence disable polling after hpd handling is shut down. + */ drm_kms_helper_poll_fini(dev); + mutex_lock(&dev->struct_mutex); intel_unregister_dsm_handler(); - list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { /* Skip inactive CRTCs */ if (!crtc->fb) @@ -9553,12 +9564,6 @@ void intel_modeset_cleanup(struct drm_device *dev) mutex_unlock(&dev->struct_mutex); - /* Disable the irq before mode object teardown, for the irq might - * enqueue unpin/hotplug work. */ - drm_irq_uninstall(dev); - cancel_work_sync(&dev_priv->hotplug_work); - cancel_work_sync(&dev_priv->rps.work); - /* flush any delayed tasks or pending work */ flush_scheduled_work(); diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 8b7f050decdd..bb45122173dd 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3671,6 +3671,9 @@ void intel_disable_gt_powersave(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; + /* Interrupts should be disabled already to avoid re-arming. */ + WARN_ON(dev->irq_enabled); + if (IS_IRONLAKE_M(dev)) { ironlake_disable_drps(dev); ironlake_disable_rc6(dev);