[ofa-general] [PATCH -stable] IB/core: Ignore membership bit in ib_find_pkey()

[Moni Shoua]

ib_find_pkey() is used as a replacement for ib_find_cached_pkey(), and
the original function ignored the membership bit when searching for a
P_Key, so ib_find_pkey() should ignore the bit too.

In particular, IPoIB turns on the P_Key membership bit of limited
membership P_Keys when creating a child interface and looks for the
full membership P_key.  This broke if a port was a partial member of a
partition when IPoIB switched from ib_find_cached_pkey() to
ib_find_pkey(), and this change fixes things again.

Signed-off-by: Moni Shoua <monis at voltaire.com>
Signed-off-by: Roland Dreier <rolandd at cisco.com>
---

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 3ada17c..2506c43 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -702,7 +702,7 @@ int ib_find_pkey(struct ib_device *device,
 		if (ret)
 			return ret;
 
-		if (pkey == tmp_pkey) {
+		if ((pkey & 0x7fff) == (tmp_pkey & 0x7fff)) {
 			*index = i;
 			return 0;
 		}