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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>
This commit is contained in:
Hamo 2011-12-15 14:23:16 +08:00 committed by Avi Kivity
parent d546cb406e
commit 4f69b6805c
1 changed files with 23 additions and 3 deletions
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26
virt/kvm/kvm_main.c
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@ -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: