[IB] mthca: Don't enter QP into MCG more than once.
Avoid entering a QP as member of a multicast group multiple times.
Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/mthca/mthca_mcg.c b/drivers/infiniband/hw/mthca/mthca_mcg.c
index 9a0612a9..b47ea7d 100644
--- a/drivers/infiniband/hw/mthca/mthca_mcg.c
+++ b/drivers/infiniband/hw/mthca/mthca_mcg.c
@@ -185,7 +185,12 @@
}
for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
- if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
+ if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31))) {
+ mthca_dbg(dev, "QP %06x already a member of MGM\n",
+ ibqp->qp_num);
+ err = 0;
+ goto out;
+ } else if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
break;
}