3 files changed, 34 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_cq.c b/drivers/infiniband/hw/mthca/mthca_cq.c
index e393681ba7d4..149b36901239 100644
--- a/drivers/infiniband/hw/mthca/mthca_cq.c
+++ b/drivers/infiniband/hw/mthca/mthca_cq.c
@@ -39,6 +39,8 @@
 #include <linux/init.h>
 #include <linux/hardirq.h>
 
+#include <asm/io.h>
+
 #include <rdma/ib_pack.h>
 
 #include "mthca_dev.h"
@@ -210,6 +212,11 @@ static inline void update_cons_index(struct mthca_dev *dev, struct mthca_cq *cq,
                 mthca_write64(doorbell,
                               dev->kar + MTHCA_CQ_DOORBELL,
                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
+                /*
+                 * Make sure doorbells don't leak out of CQ spinlock
+                 * and reach the HCA out of order:
+                 */
+                mmiowb();
         }
 }
 
diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c
index 5e5c58b9920b..6a7822e0fc19 100644
--- a/drivers/infiniband/hw/mthca/mthca_qp.c
+++ b/drivers/infiniband/hw/mthca/mthca_qp.c
@@ -39,6 +39,8 @@
 #include <linux/string.h>
 #include <linux/slab.h>
 
+#include <asm/io.h>
+
 #include <rdma/ib_verbs.h>
 #include <rdma/ib_cache.h>
 #include <rdma/ib_pack.h>
@@ -1732,6 +1734,11 @@ out:
                 mthca_write64(doorbell,
                               dev->kar + MTHCA_SEND_DOORBELL,
                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
+                /*
+                 * Make sure doorbells don't leak out of SQ spinlock
+                 * and reach the HCA out of order:
+                 */
+                mmiowb();
         }
 
         qp->sq.next_ind = ind;
@@ -1851,6 +1858,12 @@ out:
         qp->rq.next_ind = ind;
         qp->rq.head    += nreq;
 
+        /*
+         * Make sure doorbells don't leak out of RQ spinlock and reach
+         * the HCA out of order:
+         */
+        mmiowb();
+
         spin_unlock_irqrestore(&qp->rq.lock, flags);
         return err;
 }
@@ -2112,6 +2125,12 @@ out:
                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
         }
 
+        /*
+         * Make sure doorbells don't leak out of SQ spinlock and reach
+         * the HCA out of order:
+         */
+        mmiowb();
+
         spin_unlock_irqrestore(&qp->sq.lock, flags);
         return err;
 }
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index 92a72f521528..f5d7677d1079 100644
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -35,6 +35,8 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 
+#include <asm/io.h>
+
 #include "mthca_dev.h"
 #include "mthca_cmd.h"
 #include "mthca_memfree.h"
@@ -595,6 +597,12 @@ int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
         }
 
+        /*
+         * Make sure doorbells don't leak out of SRQ spinlock and
+         * reach the HCA out of order:
+         */
+        mmiowb();
+
         spin_unlock_irqrestore(&srq->lock, flags);
         return err;
 }