Commit df630b8c authored by Peter Xu's avatar Peter Xu Committed by Paolo Bonzini
Browse files

KVM: x86: clear bus pointer when destroyed

When releasing the bus, let's clear the bus pointers to mark it out. If
any further device unregister happens on this bus, we know that we're
done if we found the bus being released already.

Signed-off-by: default avatarPeter Xu <>
Signed-off-by: default avatarRadim Krčmář <>
parent 3aa53859
......@@ -727,8 +727,10 @@ static void kvm_destroy_vm(struct kvm *kvm)
for (i = 0; i < KVM_NR_BUSES; i++)
for (i = 0; i < KVM_NR_BUSES; i++) {
kvm->buses[i] = NULL;
mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
......@@ -3579,6 +3581,14 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
struct kvm_io_bus *new_bus, *bus;
bus = kvm->buses[bus_idx];
* It's possible the bus being released before hand. If so,
* we're done here.
if (!bus)
return 0;
r = -ENOENT;
for (i = 0; i < bus->dev_count; i++)
if (bus->range[i].dev == dev) {
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