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authorPeter Xu <peterx@redhat.com>2017-03-15 16:01:17 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2017-03-21 17:11:18 +0100
commitdf630b8c1e851b5e265dc2ca9c87222e342c093b (patch)
treea033e928a091f3d9368da2c6a33e524f4bd62e66 /virt
parent3aa53859d23e1b9cf1a60f82a9008e35ef10bd6a (diff)
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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: Peter Xu <peterx@redhat.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a17d78759727..7445566fadc1 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -727,8 +727,10 @@ static void kvm_destroy_vm(struct kvm *kvm)
list_del(&kvm->vm_list);
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);
@@ -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) {