[PATCH 3.16.y-ckt 157/180] xprtrdma: Prevent infinite loop in rpcrdma_ep_create()

[Luis Henriques]

3.16.7-ckt11 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chuck Lever <chuck.lever at oracle.com>

commit 41f97028969e4c88efa5fcf58bc6125210413a6d upstream.

If a provider advertizes a zero max_fast_reg_page_list_len, FRWR
depth detection loops forever. Instead of just failing the mount,
try other memory registration modes.

Fixes: 0fc6c4e7bb28 ("xprtrdma: mind the device's max fast . . .")
Reported-by: Devesh Sharma <Devesh.Sharma at Emulex.Com>
Signed-off-by: Chuck Lever <chuck.lever at oracle.com>
Tested-by: Devesh Sharma <Devesh.Sharma at Emulex.Com>
Tested-by: Meghana Cheripady <Meghana.Cheripady at Emulex.Com>
Tested-by: Veeresh U. Kokatnur <veereshuk at chelsio.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker at Netapp.com>
[ luis: backported to 3.16:
  - devattr struct isn't a pointer ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 net/sunrpc/xprtrdma/verbs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 13dbd1c389ff..9ec12f834c43 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -541,9 +541,10 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
 
 	if (memreg == RPCRDMA_FRMR) {
 		/* Requires both frmr reg and local dma lkey */
-		if ((devattr.device_cap_flags &
+		if (((devattr.device_cap_flags &
 		     (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) !=
-		    (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) {
+		    (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) ||
+		      (devattr.max_fast_reg_page_list_len == 0)) {
 			dprintk("RPC:       %s: FRMR registration "
 				"not supported by HCA\n", __func__);
 			memreg = RPCRDMA_MTHCAFMR;