NFSv4: Add lockdep checks to nfs4_wait_clnt_recover()
Attempt to detect deadlocks due to caller holding locks on clp->cl_sem
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 35bfcce..1712d03 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2711,11 +2711,15 @@
might_sleep();
+ rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
+
rpc_clnt_sigmask(clnt, &oldset);
res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
nfs4_wait_bit_interruptible,
TASK_INTERRUPTIBLE);
rpc_clnt_sigunmask(clnt, &oldset);
+
+ rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
return res;
}