NFSv4.1 end back channel session draining

We need to ensure that we clear NFS4_SLOT_TBL_DRAINING on the back
channel when we're done recovering the session.

Regression introduced by commit 774d5f14e (NFSv4.1 Fix a pNFS session
draining deadlock)

Signed-off-by: Andy Adamson <andros@netapp.com>
[Trond: Changed order to start back-channel first. Minor code cleanup]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org [>=3.10]

1 files changed, 11 insertions, 12 deletions

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 5244ffd304e8..b0e42d7a19a1 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -228,19 +228,8 @@ static int nfs41_setup_state_renewal(struct nfs_client *clp)
         return status;
 }
 
-/*
- * Back channel returns NFS4ERR_DELAY for new requests when
- * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
- * is ended.
- */
-static void nfs4_end_drain_session(struct nfs_client *clp)
+static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
 {
-        struct nfs4_session *ses = clp->cl_session;
-        struct nfs4_slot_table *tbl;
-
-        if (ses == NULL)
-                return;
-        tbl = &ses->fc_slot_table;
         if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
                 spin_lock(&tbl->slot_tbl_lock);
                 nfs41_wake_slot_table(tbl);
@@ -248,6 +237,16 @@ static void nfs4_end_drain_session(struct nfs_client *clp)
         }
 }
 
+static void nfs4_end_drain_session(struct nfs_client *clp)
+{
+        struct nfs4_session *ses = clp->cl_session;
+
+        if (ses != NULL) {
+                nfs4_end_drain_slot_table(&ses->bc_slot_table);
+                nfs4_end_drain_slot_table(&ses->fc_slot_table);
+        }
+}
+
 /*
  * Signal state manager thread if session fore channel is drained
  */