NFSD: Clear signals before exiting the nfsd() thread

  Fixes the error "RPC: failed to contact portmap (errno -512)." when the
  server later tries to unregister from the portmapper.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---
 nfssvc.c |    2 ++
 1 files changed, 2 insertions(+)

Index: linux-2.6.12-rc1/fs/nfsd/nfssvc.c
===================================================================
--- linux-2.6.12-rc1.orig/fs/nfsd/nfssvc.c
+++ linux-2.6.12-rc1/fs/nfsd/nfssvc.c
@@ -258,6 +258,8 @@ nfsd(struct svc_rqst *rqstp)
 				break;
 		err = signo;
 	}
+	/* Clear signals before calling lockd_down() and svc_exit_thread() */
+	flush_signals(current);
 
 	lock_kernel();