From: Daniel Vetter Date: Fri, 20 Aug 2010 16:26:46 +0000 (+0200) Subject: drm/i915: unload: fix hotplug_work races X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6c0d93500eb50098e4e35b8b79e073f2f2f5b773;p=linux.git drm/i915: unload: fix hotplug_work races hotplug_work is queued by the hotplug interrupt and only either emits a hotplug uevent or queues a crt poll slow-work. No other locking. So it's safe to cancel this work _after_ irq's have been turned off. But before the modesetting objects are destroyed because the hotplug function accesses them (without locking). The current code (for kms) only switches irqs off after modesetting teardown, hence move the irq teardown into the modeset cleanup right before the crtc cleanup. Signed-off-by: Daniel Vetter Signed-off-by: Chris Wilson --- diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 736cca8a03d48..45236e7166692 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -2275,7 +2275,7 @@ int i915_driver_unload(struct drm_device *dev) dev_priv->child_dev = NULL; dev_priv->child_dev_num = 0; } - drm_irq_uninstall(dev); + vga_switcheroo_unregister_client(dev->pdev); vga_client_register(dev->pdev, NULL, NULL, NULL); } diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 7c9103030036d..20be935830b0b 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -6073,6 +6073,11 @@ 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); + drm_mode_config_cleanup(dev); }