lockd: Do not start the lockd thread before we've set nlmsvc_rqst->rq_task

This fixes an Oopsable race when starting lockd.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index b416b3355807..09857b48d0c3 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -306,7 +306,7 @@ static int lockd_start_svc(struct svc_serv *serv)
         svc_sock_update_bufs(serv);
         serv->sv_maxconn = nlm_max_connections;
 
-        nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, "%s", serv->sv_name);
+        nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
         if (IS_ERR(nlmsvc_task)) {
                 error = PTR_ERR(nlmsvc_task);
                 printk(KERN_WARNING
@@ -314,6 +314,7 @@ static int lockd_start_svc(struct svc_serv *serv)
                 goto out_task;
         }
         nlmsvc_rqst->rq_task = nlmsvc_task;
+        wake_up_process(nlmsvc_task);
 
         dprintk("lockd_up: service started\n");
         return 0;