KVM: x86: clear bus pointer when destroyed

commit df630b8c1e851b5e265dc2ca9c87222e342c093b upstream.

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: Peter Xu <peterx@redhat.com>
Signed-off-by: Radim KrÄ\8dmáÅ\99 <rkrcmar@redhat.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f71c4ad425c652cbbb7362fc650904697ad0f6fe..e9128725ff11c4ba07062575a3ba7214c8e9b72b 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -607,8 +607,10 @@ static void kvm_destroy_vm(struct kvm *kvm)
        list_del(&kvm->vm_list);
        raw_spin_unlock(&kvm_lock);
        kvm_free_irq_routing(kvm);
-       for (i = 0; i < KVM_NR_BUSES; i++)
+       for (i = 0; i < KVM_NR_BUSES; i++) {
                kvm_io_bus_destroy(kvm->buses[i]);
+               kvm->buses[i] = NULL;
+       }
        kvm_coalesced_mmio_free(kvm);
 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
        mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
@@ -2959,6 +2961,14 @@ 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) {