RDMA/iw_cxgb4: fix SRQ access from dump_qp()

dump_qp() is wrongly trying to dump SRQ structures as QP when SRQ is used
by the application. This patch matches the QPID before dumping them.  Also
removes unwanted SRQ id addition to QP id xarray.

Fixes: 2f43129127 ("cxgb4: Convert qpidr to XArray")
Link: https://lore.kernel.org/r/20190930074119.20046-1-bharat@chelsio.com
Signed-off-by: Rahul Kundu <rahul.kundu@chelsio.com>
Signed-off-by: Potnuri Bharat Teja <bharat@chelsio.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/cxgb4/device.c

@@ -242,10 +242,13 @@ static void set_ep_sin6_addrs(struct c4iw_ep *ep,
 	}
 }
 
-static int dump_qp(struct c4iw_qp *qp, struct c4iw_debugfs_data *qpd)
+static int dump_qp(unsigned long id, struct c4iw_qp *qp,
+		   struct c4iw_debugfs_data *qpd)
 {
 	int space;
 	int cc;
+	if (id != qp->wq.sq.qid)
+		return 0;
 
 	space = qpd->bufsize - qpd->pos - 1;
 	if (space == 0)
@@ -350,7 +353,7 @@ static int qp_open(struct inode *inode, struct file *file)
 
 	xa_lock_irq(&qpd->devp->qps);
 	xa_for_each(&qpd->devp->qps, index, qp)
-		dump_qp(qp, qpd);
+		dump_qp(index, qp, qpd);
 	xa_unlock_irq(&qpd->devp->qps);
 
 	qpd->buf[qpd->pos++] = 0;

drivers/infiniband/hw/cxgb4/qp.c

@@ -2737,15 +2737,11 @@ int c4iw_create_srq(struct ib_srq *ib_srq, struct ib_srq_init_attr *attrs,
 	if (CHELSIO_CHIP_VERSION(rhp->rdev.lldi.adapter_type) > CHELSIO_T6)
 		srq->flags = T4_SRQ_LIMIT_SUPPORT;
 
-	ret = xa_insert_irq(&rhp->qps, srq->wq.qid, srq, GFP_KERNEL);
-	if (ret)
-		goto err_free_queue;
-
 	if (udata) {
 		srq_key_mm = kmalloc(sizeof(*srq_key_mm), GFP_KERNEL);
 		if (!srq_key_mm) {
 			ret = -ENOMEM;
-			goto err_remove_handle;
+			goto err_free_queue;
 		}
 		srq_db_key_mm = kmalloc(sizeof(*srq_db_key_mm), GFP_KERNEL);
 		if (!srq_db_key_mm) {
@@ -2789,8 +2785,6 @@ err_free_srq_db_key_mm:
 	kfree(srq_db_key_mm);
 err_free_srq_key_mm:
 	kfree(srq_key_mm);
-err_remove_handle:
-	xa_erase_irq(&rhp->qps, srq->wq.qid);
 err_free_queue:
 	free_srq_queue(srq, ucontext ? &ucontext->uctx : &rhp->rdev.uctx,
 		       srq->wr_waitp);
@@ -2813,8 +2807,6 @@ void c4iw_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata)
 	rhp = srq->rhp;
 
 	pr_debug("%s id %d\n", __func__, srq->wq.qid);
-
-	xa_erase_irq(&rhp->qps, srq->wq.qid);
 	ucontext = rdma_udata_to_drv_context(udata, struct c4iw_ucontext,
 					     ibucontext);
 	free_srq_queue(srq, ucontext ? &ucontext->uctx : &rhp->rdev.uctx,