Merge tag 'nfs-for-4.9-3' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client bugfixes from Anna Schumaker:
 "Most of these fix regressions in 4.9, and none are going to stable
  this time around.

  Bugfixes:
   - Trim extra slashes in v4 nfs_paths to fix tools that use this
   - Fix a -Wmaybe-uninitialized warnings
   - Fix suspicious RCU usages
   - Fix Oops when mounting multiple servers at once
   - Suppress a false-positive pNFS error
   - Fix a DMAR failure in NFS over RDMA"

* tag 'nfs-for-4.9-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  xprtrdma: Fix DMAR failure in frwr_op_map() after reconnect
  fs/nfs: Fix used uninitialized warn in nfs4_slot_seqid_in_use()
  NFS: Don't print a pNFS error if we aren't using pNFS
  NFS: Ignore connections that have cl_rpcclient uninitialized
  SUNRPC: Fix suspicious RCU usage
  NFSv4.1: work around -Wmaybe-uninitialized warning
  NFS: Trim extra slash in v4 nfs_path

4 files changed, 12 insertions, 7 deletions

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 7555ba889d1f..ebecfb8fba06 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -314,7 +314,8 @@ static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *dat
 		/* Match the full socket address */
 		if (!rpc_cmp_addr_port(sap, clap))
 			/* Match all xprt_switch full socket addresses */
-			if (!rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
+			if (IS_ERR(clp->cl_rpcclient) ||
+                            !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
 							   sap))
 				continue;
 
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index c8162c660c44..5551e8ef67fd 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -98,7 +98,7 @@ rename_retry:
 		return end;
 	}
 	namelen = strlen(base);
-	if (flags & NFS_PATH_CANONICAL) {
+	if (*end == '/') {
 		/* Strip off excess slashes in base string */
 		while (namelen > 0 && base[namelen - 1] == '/')
 			namelen--;
diff --git a/fs/nfs/nfs4session.c b/fs/nfs/nfs4session.c
index b62973045a3e..a61350f75c74 100644
--- a/fs/nfs/nfs4session.c
+++ b/fs/nfs/nfs4session.c
@@ -178,12 +178,14 @@ static int nfs4_slot_get_seqid(struct nfs4_slot_table  *tbl, u32 slotid,
 	__must_hold(&tbl->slot_tbl_lock)
 {
 	struct nfs4_slot *slot;
+	int ret;
 
 	slot = nfs4_lookup_slot(tbl, slotid);
-	if (IS_ERR(slot))
-		return PTR_ERR(slot);
-	*seq_nr = slot->seq_nr;
-	return 0;
+	ret = PTR_ERR_OR_ZERO(slot);
+	if (!ret)
+		*seq_nr = slot->seq_nr;
+
+	return ret;
 }
 
 /*
@@ -196,7 +198,7 @@ static int nfs4_slot_get_seqid(struct nfs4_slot_table  *tbl, u32 slotid,
 static bool nfs4_slot_seqid_in_use(struct nfs4_slot_table *tbl,
 		u32 slotid, u32 seq_nr)
 {
-	u32 cur_seq;
+	u32 cur_seq = 0;
 	bool ret = false;
 
 	spin_lock(&tbl->slot_tbl_lock);
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 56b2d96f9103..259ef85f435a 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -146,6 +146,8 @@ set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
 	u32 id;
 	int i;
 
+	if (fsinfo->nlayouttypes == 0)
+		goto out_no_driver;
 	if (!(server->nfs_client->cl_exchange_flags &
 		 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
 		printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",