RDMA/qedr: Remove CQ spinlock from CM completion handlers

There is only a single event queue that triggers the completion
events for the RDMA CM and it is being processed serially. This means
that inherently there can no parallelism of CQ completion handler
callbacks, hence the lock is redundant.

Signed-off-by: Ram Amrani <Ram.Amrani@cavium.com>
Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/qedr/qedr.h

@@ -251,9 +251,6 @@ struct qedr_cq {
 
 	u16 icid;
 
-	/* Lock to protect completion handler */
-	spinlock_t comp_handler_lock;
-
 	/* Lock to protect multiplem CQ's */
 	spinlock_t cq_lock;
 	u8 arm_flags;

drivers/infiniband/hw/qedr/qedr_cm.c

@@ -87,11 +87,8 @@ void qedr_ll2_tx_cb(void *_qdev, struct qed_roce_ll2_packet *pkt)
 	qedr_inc_sw_gsi_cons(&qp->sq);
 	spin_unlock_irqrestore(&qp->q_lock, flags);
 
-	if (cq->ibcq.comp_handler) {
-		spin_lock_irqsave(&cq->comp_handler_lock, flags);
+	if (cq->ibcq.comp_handler)
 		(*cq->ibcq.comp_handler) (&cq->ibcq, cq->ibcq.cq_context);
-		spin_unlock_irqrestore(&cq->comp_handler_lock, flags);
-	}
 }
 
 void qedr_ll2_rx_cb(void *_dev, struct qed_roce_ll2_packet *pkt,
@@ -113,11 +110,8 @@ void qedr_ll2_rx_cb(void *_dev, struct qed_roce_ll2_packet *pkt,
 
 	spin_unlock_irqrestore(&qp->q_lock, flags);
 
-	if (cq->ibcq.comp_handler) {
-		spin_lock_irqsave(&cq->comp_handler_lock, flags);
+	if (cq->ibcq.comp_handler)
 		(*cq->ibcq.comp_handler) (&cq->ibcq, cq->ibcq.cq_context);
-		spin_unlock_irqrestore(&cq->comp_handler_lock, flags);
-	}
 }
 
 static void qedr_destroy_gsi_cq(struct qedr_dev *dev,