From: Sean Christopherson Date: Fri, 11 Nov 2022 00:22:25 +0000 (+0000) Subject: drm/i915/gvt: Unconditionally put reference to KVM when detaching vGPU X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3c9fd44b9330adc5006653566f3d386784b2080e;p=linux.git drm/i915/gvt: Unconditionally put reference to KVM when detaching vGPU Always put the KVM reference when closing a vCPU device, as intel_vgpu_open_device() succeeds if and only if the KVM pointer is valid and a reference to KVM is acquired. And if that doesn't hold true, the call to kvm_page_track_unregister_notifier() a few lines earlier is doomed. Reviewed-by: Kevin Tian Signed-off-by: Sean Christopherson Signed-off-by: Zhenyu Wang Link: http://patchwork.freedesktop.org/patch/msgid/20221111002225.2418386-3-seanjc@google.com --- diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index e67d5267fde07..714221f9a1315 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -714,15 +714,14 @@ static void intel_vgpu_close_device(struct vfio_device *vfio_dev) kvm_page_track_unregister_notifier(vgpu->vfio_device.kvm, &vgpu->track_node); + kvm_put_kvm(vgpu->vfio_device.kvm); + kvmgt_protect_table_destroy(vgpu); gvt_cache_destroy(vgpu); intel_vgpu_release_msi_eventfd_ctx(vgpu); vgpu->attached = false; - - if (vgpu->vfio_device.kvm) - kvm_put_kvm(vgpu->vfio_device.kvm); } static u64 intel_vgpu_get_bar_addr(struct intel_vgpu *vgpu, int bar)