On Fri, Dec 18, 2015 at 12:38:59PM -0800, yu.dai@xxxxxxxxx wrote: > From: Alex Dai <yu.dai@xxxxxxxxx> > > The device struct_mutex needs to be held before releasing any GEM > objects allocated by GuC. > > WARNING: CPU: 0 PID: 1575 at include/drm/drm_gem.h:217 gem_release_guc_obj+0x5f/0x70 [i915]() > Call Trace: > [<ffffffff813c8b64>] dump_stack+0x44/0x60 > [<ffffffff8107d642>] warn_slowpath_common+0x82/0xc0 > [<ffffffff8107d78a>] warn_slowpath_null+0x1a/0x20 > [<ffffffffc02369ef>] gem_release_guc_obj+0x5f/0x70 [i915] > [<ffffffffc02380ba>] i915_guc_submission_fini+0x1a/0x70 [i915] > [<ffffffffc0235d09>] intel_guc_ucode_fini+0x29/0xa0 [i915] > [<ffffffffc029595d>] i915_driver_unload+0x14d/0x290 [i915] > [<ffffffffc00912a9>] drm_dev_unregister+0x29/0xb0 [drm] > [<ffffffffc00919d3>] drm_put_dev+0x23/0x60 [drm] > [<ffffffffc01d51b5>] i915_pci_remove+0x15/0x20 [i915] > [<ffffffff81419b49>] pci_device_remove+0x39/0xc0 > [<ffffffff81527f51>] __device_release_driver+0xa1/0x150 > [<ffffffff81528a85>] driver_detach+0xb5/0xc0 > [<ffffffff815279b5>] bus_remove_driver+0x55/0xd0 > [<ffffffff8152921c>] driver_unregister+0x2c/0x50 > [<ffffffff814181e9>] pci_unregister_driver+0x29/0x90 > [<ffffffffc0093174>] drm_pci_exit+0x94/0xb0 [drm] > [<ffffffffc02960c4>] i915_exit+0x20/0xf5c [i915] > [<ffffffff81102bc5>] SyS_delete_module+0x1b5/0x210 > [<ffffffff817fc2b6>] entry_SYSCALL_64_fastpath+0x16/0x75 > ---[ end trace f711c4eb63588bb7 ]--- > > v1: Add backtrace log. > When resending a patch, please add everyone who commented on the previous patch to the Cc: list here. Thanks, Daniel > Signed-off-by: Alex Dai <yu.dai@xxxxxxxxx> > > diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c > index 625272f4..4748651 100644 > --- a/drivers/gpu/drm/i915/intel_guc_loader.c > +++ b/drivers/gpu/drm/i915/intel_guc_loader.c > @@ -631,10 +631,10 @@ void intel_guc_ucode_fini(struct drm_device *dev) > struct drm_i915_private *dev_priv = dev->dev_private; > struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw; > > + mutex_lock(&dev->struct_mutex); > direct_interrupts_to_host(dev_priv); > i915_guc_submission_fini(dev); > > - mutex_lock(&dev->struct_mutex); > if (guc_fw->guc_fw_obj) > drm_gem_object_unreference(&guc_fw->guc_fw_obj->base); > guc_fw->guc_fw_obj = NULL; > -- > 2.5.0 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
