kvm: Fix kvm_get_page_retry_io __gup retval check

Confusion around -EBUSY and zero (inside a BUG_ON no less).

Reported-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andres Lagar-Cavilla <andreslc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 3f16f569169e..a1cf53ee0d28 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1146,7 +1146,7 @@ int kvm_get_user_page_io(struct task_struct *tsk, struct mm_struct *mm,
         npages = __get_user_pages(tsk, mm, addr, 1, flags, pagep, NULL,
                                   &locked);
         if (!locked) {
-                VM_BUG_ON(npages != -EBUSY);
+                VM_BUG_ON(npages);
 
                 if (!pagep)
                         return 0;