RDMA/cxgb3: Don't pass irq flags to flush_qp()

Since flush_qp() is always called with irqs disabled, all the locking
inside flush_qp() and __flush_qp() doesn't need irq save/restore.

Further, passing the flag variable from iwch_modify_qp() is just wrong
and causes a WARN_ON() in local_bh_enable().

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/cxgb3/iwch_qp.c

@@ -803,7 +803,7 @@ int iwch_post_terminate(struct iwch_qp *qhp, struct respQ_msg_t *rsp_msg)
  * Assumes qhp lock is held.
  */
 static void __flush_qp(struct iwch_qp *qhp, struct iwch_cq *rchp,
-				struct iwch_cq *schp, unsigned long *flag)
+				struct iwch_cq *schp)
 {
 	int count;
 	int flushed;
@@ -812,44 +812,44 @@ static void __flush_qp(struct iwch_qp *qhp, struct iwch_cq *rchp,
 	PDBG("%s qhp %p rchp %p schp %p\n", __func__, qhp, rchp, schp);
 	/* take a ref on the qhp since we must release the lock */
 	atomic_inc(&qhp->refcnt);
-	spin_unlock_irqrestore(&qhp->lock, *flag);
+	spin_unlock(&qhp->lock);
 
 	/* locking hierarchy: cq lock first, then qp lock. */
-	spin_lock_irqsave(&rchp->lock, *flag);
+	spin_lock(&rchp->lock);
 	spin_lock(&qhp->lock);
 	cxio_flush_hw_cq(&rchp->cq);
 	cxio_count_rcqes(&rchp->cq, &qhp->wq, &count);
 	flushed = cxio_flush_rq(&qhp->wq, &rchp->cq, count);
 	spin_unlock(&qhp->lock);
-	spin_unlock_irqrestore(&rchp->lock, *flag);
+	spin_unlock(&rchp->lock);
 	if (flushed) {
-		spin_lock_irqsave(&rchp->comp_handler_lock, *flag);
+		spin_lock(&rchp->comp_handler_lock);
 		(*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context);
-		spin_unlock_irqrestore(&rchp->comp_handler_lock, *flag);
+		spin_unlock(&rchp->comp_handler_lock);
 	}
 
 	/* locking hierarchy: cq lock first, then qp lock. */
-	spin_lock_irqsave(&schp->lock, *flag);
+	spin_lock(&schp->lock);
 	spin_lock(&qhp->lock);
 	cxio_flush_hw_cq(&schp->cq);
 	cxio_count_scqes(&schp->cq, &qhp->wq, &count);
 	flushed = cxio_flush_sq(&qhp->wq, &schp->cq, count);
 	spin_unlock(&qhp->lock);
-	spin_unlock_irqrestore(&schp->lock, *flag);
+	spin_unlock(&schp->lock);
 	if (flushed) {
-		spin_lock_irqsave(&schp->comp_handler_lock, *flag);
+		spin_lock(&schp->comp_handler_lock);
 		(*schp->ibcq.comp_handler)(&schp->ibcq, schp->ibcq.cq_context);
-		spin_unlock_irqrestore(&schp->comp_handler_lock, *flag);
+		spin_unlock(&schp->comp_handler_lock);
 	}
 
 	/* deref */
 	if (atomic_dec_and_test(&qhp->refcnt))
 	        wake_up(&qhp->wait);
 
-	spin_lock_irqsave(&qhp->lock, *flag);
+	spin_lock(&qhp->lock);
 }
 
-static void flush_qp(struct iwch_qp *qhp, unsigned long *flag)
+static void flush_qp(struct iwch_qp *qhp)
 {
 	struct iwch_cq *rchp, *schp;
 
@@ -859,19 +859,19 @@ static void flush_qp(struct iwch_qp *qhp, unsigned long *flag)
 	if (qhp->ibqp.uobject) {
 		cxio_set_wq_in_error(&qhp->wq);
 		cxio_set_cq_in_error(&rchp->cq);
-		spin_lock_irqsave(&rchp->comp_handler_lock, *flag);
+		spin_lock(&rchp->comp_handler_lock);
 		(*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context);
-		spin_unlock_irqrestore(&rchp->comp_handler_lock, *flag);
+		spin_unlock(&rchp->comp_handler_lock);
 		if (schp != rchp) {
 			cxio_set_cq_in_error(&schp->cq);
-			spin_lock_irqsave(&schp->comp_handler_lock, *flag);
+			spin_lock(&schp->comp_handler_lock);
 			(*schp->ibcq.comp_handler)(&schp->ibcq,
 						   schp->ibcq.cq_context);
-			spin_unlock_irqrestore(&schp->comp_handler_lock, *flag);
+			spin_unlock(&schp->comp_handler_lock);
 		}
 		return;
 	}
-	__flush_qp(qhp, rchp, schp, flag);
+	__flush_qp(qhp, rchp, schp);
 }
 
 
@@ -1030,7 +1030,7 @@ int iwch_modify_qp(struct iwch_dev *rhp, struct iwch_qp *qhp,
 			break;
 		case IWCH_QP_STATE_ERROR:
 			qhp->attr.state = IWCH_QP_STATE_ERROR;
-			flush_qp(qhp, &flag);
+			flush_qp(qhp);
 			break;
 		default:
 			ret = -EINVAL;
@@ -1078,7 +1078,7 @@ int iwch_modify_qp(struct iwch_dev *rhp, struct iwch_qp *qhp,
 		}
 		switch (attrs->next_state) {
 			case IWCH_QP_STATE_IDLE:
-				flush_qp(qhp, &flag);
+				flush_qp(qhp);
 				qhp->attr.state = IWCH_QP_STATE_IDLE;
 				qhp->attr.llp_stream_handle = NULL;
 				put_ep(&qhp->ep->com);
@@ -1132,7 +1132,7 @@ err:
 	free=1;
 	wake_up(&qhp->wait);
 	BUG_ON(!ep);
-	flush_qp(qhp, &flag);
+	flush_qp(qhp);
 out:
 	spin_unlock_irqrestore(&qhp->lock, flag);