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| author |   Paolo Bonzini <pbonzini@redhat.com> | 2018-08-06 17:31:36 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-08-06 17:31:36 +0200 |
| commit | d2ce98ca0a192e1bcb89068adfe6cb736f5e351c (patch) | |
| tree | 888ccaba7b3e09bf4b81324dff38a65f5667296c /virt | |
| parent | Merge tag 'kvm-s390-next-4.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD (diff) | |
| parent | Linux 4.18-rc6 (diff) | |
| download | linux-dev-d2ce98ca0a192e1bcb89068adfe6cb736f5e351c.tar.xz linux-dev-d2ce98ca0a192e1bcb89068adfe6cb736f5e351c.zip | |
Merge tag 'v4.18-rc6' into HEAD
Pull bug fixes into the KVM development tree to avoid nasty conflicts.
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/eventfd.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 90d30fbe95ae..b20b751286fc 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -119,8 +119,12 @@ irqfd_shutdown(struct work_struct *work) { struct kvm_kernel_irqfd *irqfd = container_of(work, struct kvm_kernel_irqfd, shutdown); + struct kvm *kvm = irqfd->kvm; u64 cnt; + /* Make sure irqfd has been initalized in assign path. */ + synchronize_srcu(&kvm->irq_srcu); + /* * Synchronize with the wait-queue and unhook ourselves to prevent * further events. @@ -387,7 +391,6 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) idx = srcu_read_lock(&kvm->irq_srcu); irqfd_update(kvm, irqfd); - srcu_read_unlock(&kvm->irq_srcu, idx); list_add_tail(&irqfd->list, &kvm->irqfds.items); @@ -402,11 +405,6 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) if (events & EPOLLIN) schedule_work(&irqfd->inject); - /* - * do not drop the file until the irqfd is fully initialized, otherwise - * we might race against the EPOLLHUP - */ - fdput(f); #ifdef CONFIG_HAVE_KVM_IRQ_BYPASS if (kvm_arch_has_irq_bypass()) { irqfd->consumer.token = (void *)irqfd->eventfd; @@ -421,6 +419,13 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) } #endif + srcu_read_unlock(&kvm->irq_srcu, idx); + + /* + * do not drop the file until the irqfd is fully initialized, otherwise + * we might race against the EPOLLHUP + */ + fdput(f); return 0; fail: |