KVM: convert slots_lock to a mutex

[firefly-linux-kernel-4.4.55.git] / virt / kvm / kvm_main.c

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 659bc12ad16ac1a9a06235bdd5a12bc238ae416f..2b7cd6c0d9cab3cb97aea6dd694205d94b98606d 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -429,7 +429,7 @@ static struct kvm *kvm_create_vm(void)
        kvm_eventfd_init(kvm);
        mutex_init(&kvm->lock);
        mutex_init(&kvm->irq_lock);
-       init_rwsem(&kvm->slots_lock);
+       mutex_init(&kvm->slots_lock);
        atomic_set(&kvm->users_count, 1);
        spin_lock(&kvm_lock);
        list_add(&kvm->vm_list, &vm_list);
@@ -763,9 +763,9 @@ int kvm_set_memory_region(struct kvm *kvm,
 {
        int r;
 
-       down_write(&kvm->slots_lock);
+       mutex_lock(&kvm->slots_lock);
        r = __kvm_set_memory_region(kvm, mem, user_alloc);
-       up_write(&kvm->slots_lock);
+       mutex_unlock(&kvm->slots_lock);
        return r;
 }
 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
@@ -1997,7 +1997,7 @@ int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
        return -EOPNOTSUPP;
 }
 
-/* Caller must have write lock on slots_lock. */
+/* Caller must hold slots_lock. */
 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
                            struct kvm_io_device *dev)
 {
@@ -2019,7 +2019,7 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
        return 0;
 }
 
-/* Caller must have write lock on slots_lock. */
+/* Caller must hold slots_lock. */
 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
                              struct kvm_io_device *dev)
 {