KVM: ensure that debugfs entries have been created

by checking the return value from kvm_init_debug, we
can ensure that the entries under debugfs for KVM have
been created correctly.

Signed-off-by: Yang Bai <hamo.by@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 0835c4b..7287bf5 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2654,15 +2654,29 @@ static const struct file_operations *stat_fops[] = {
        [KVM_STAT_VM]   = &vm_stat_fops,
 };
 
-static void kvm_init_debug(void)
+static int kvm_init_debug(void)
 {
+       int r = -EFAULT;
        struct kvm_stats_debugfs_item *p;
 
        kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
-       for (p = debugfs_entries; p->name; ++p)
+       if (kvm_debugfs_dir == NULL)
+               goto out;
+
+       for (p = debugfs_entries; p->name; ++p) {
                p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
                                                (void *)(long)p->offset,
                                                stat_fops[p->kind]);
+               if (p->dentry == NULL)
+                       goto out_dir;
+       }
+
+       return 0;
+
+out_dir:
+       debugfs_remove_recursive(kvm_debugfs_dir);
+out:
+       return r;
 }
 
 static void kvm_exit_debug(void)
@@ -2806,10 +2820,16 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
        kvm_preempt_ops.sched_in = kvm_sched_in;
        kvm_preempt_ops.sched_out = kvm_sched_out;
 
-       kvm_init_debug();
+       r = kvm_init_debug();
+       if (r) {
+               printk(KERN_ERR "kvm: create debugfs files failed\n");
+               goto out_undebugfs;
+       }
 
        return 0;
 
+out_undebugfs:
+       unregister_syscore_ops(&kvm_syscore_ops);
 out_unreg:
        kvm_async_pf_deinit();
 out_free: