diff --git a/net/irda/irnet/irnet_ppp.c b/net/irda/irnet/irnet_ppp.c
index 7c22c126f0ea..6b3602de359a 100644
--- a/net/irda/irnet/irnet_ppp.c
+++ b/net/irda/irnet/irnet_ppp.c
@@ -698,9 +698,11 @@ dev_irnet_ioctl(
 
       /* Query PPP channel and unit number */
     case PPPIOCGCHAN:
+      lock_kernel();
       if(ap->ppp_open && !put_user(ppp_channel_index(&ap->chan),
 						(int __user *)argp))
 	err = 0;
+      unlock_kernel();
       break;
     case PPPIOCGUNIT:
       lock_kernel();