RDMA/bnxt_re: Avoid resource leak in case the NQ registration fails

In case the NQ alloc/enable fails, free up the already allocated/enabled
NQ before reporting failure. Also, track the alloc/enable using proper
state checking.
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/bnxt_re/bnxt_re.h

@@ -119,6 +119,8 @@ struct bnxt_re_dev {
 #define BNXT_RE_FLAG_HAVE_L2_REF		3
 #define BNXT_RE_FLAG_RCFW_CHANNEL_EN		4
 #define BNXT_RE_FLAG_QOS_WORK_REG		5
+#define BNXT_RE_FLAG_RESOURCES_ALLOCATED	7
+#define BNXT_RE_FLAG_RESOURCES_INITIALIZED	8
 #define BNXT_RE_FLAG_ISSUE_ROCE_STATS          29
 	struct net_device		*netdev;
 	unsigned int			version, major, minor;

drivers/infiniband/hw/bnxt_re/main.c

@@ -863,10 +863,8 @@ static void bnxt_re_cleanup_res(struct bnxt_re_dev *rdev)
 {
 	int i;
 
-	if (rdev->nq[0].hwq.max_elements) {
-		for (i = 1; i < rdev->num_msix; i++)
-			bnxt_qplib_disable_nq(&rdev->nq[i - 1]);
-	}
+	for (i = 1; i < rdev->num_msix; i++)
+		bnxt_qplib_disable_nq(&rdev->nq[i - 1]);
 
 	if (rdev->qplib_res.rcfw)
 		bnxt_qplib_cleanup_res(&rdev->qplib_res);
@@ -875,6 +873,7 @@ static void bnxt_re_cleanup_res(struct bnxt_re_dev *rdev)
 static int bnxt_re_init_res(struct bnxt_re_dev *rdev)
 {
 	int rc = 0, i;
+	int num_vec_enabled = 0;
 
 	bnxt_qplib_init_res(&rdev->qplib_res);
 
@@ -890,9 +889,13 @@ static int bnxt_re_init_res(struct bnxt_re_dev *rdev)
 				"Failed to enable NQ with rc = 0x%x", rc);
 			goto fail;
 		}
+		num_vec_enabled++;
 	}
 	return 0;
 fail:
+	for (i = num_vec_enabled; i >= 0; i--)
+		bnxt_qplib_disable_nq(&rdev->nq[i]);
+
 	return rc;
 }
 
@@ -924,6 +927,7 @@ static void bnxt_re_free_res(struct bnxt_re_dev *rdev)
 static int bnxt_re_alloc_res(struct bnxt_re_dev *rdev)
 {
 	int rc = 0, i;
+	int num_vec_created = 0;
 
 	/* Configure and allocate resources for qplib */
 	rdev->qplib_res.rcfw = &rdev->rcfw;
@@ -950,7 +954,7 @@ static int bnxt_re_alloc_res(struct bnxt_re_dev *rdev)
 		if (rc) {
 			dev_err(rdev_to_dev(rdev), "Alloc Failed NQ%d rc:%#x",
 				i, rc);
-			goto dealloc_dpi;
+			goto free_nq;
 		}
 		rc = bnxt_re_net_ring_alloc
 			(rdev, rdev->nq[i].hwq.pbl[PBL_LVL_0].pg_map_arr,
@@ -963,14 +967,17 @@ static int bnxt_re_alloc_res(struct bnxt_re_dev *rdev)
 			dev_err(rdev_to_dev(rdev),
 				"Failed to allocate NQ fw id with rc = 0x%x",
 				rc);
+			bnxt_qplib_free_nq(&rdev->nq[i]);
 			goto free_nq;
 		}
+		num_vec_created++;
 	}
 	return 0;
 free_nq:
-	for (i = 0; i < rdev->num_msix - 1; i++)
+	for (i = num_vec_created; i >= 0; i--) {
+		bnxt_re_net_ring_free(rdev, rdev->nq[i].ring_id);
 		bnxt_qplib_free_nq(&rdev->nq[i]);
-dealloc_dpi:
+	}
 	bnxt_qplib_dealloc_dpi(&rdev->qplib_res,
 			       &rdev->qplib_res.dpi_tbl,
 			       &rdev->dpi_privileged);
@@ -1205,8 +1212,11 @@ static void bnxt_re_ib_unreg(struct bnxt_re_dev *rdev)
 	if (test_and_clear_bit(BNXT_RE_FLAG_QOS_WORK_REG, &rdev->flags))
 		cancel_delayed_work_sync(&rdev->worker);
 
-	bnxt_re_cleanup_res(rdev);
-	bnxt_re_free_res(rdev);
+	if (test_and_clear_bit(BNXT_RE_FLAG_RESOURCES_INITIALIZED,
+			       &rdev->flags))
+		bnxt_re_cleanup_res(rdev);
+	if (test_and_clear_bit(BNXT_RE_FLAG_RESOURCES_ALLOCATED, &rdev->flags))
+		bnxt_re_free_res(rdev);
 
 	if (test_and_clear_bit(BNXT_RE_FLAG_RCFW_CHANNEL_EN, &rdev->flags)) {
 		rc = bnxt_qplib_deinit_rcfw(&rdev->rcfw);
@@ -1335,12 +1345,15 @@ static int bnxt_re_ib_reg(struct bnxt_re_dev *rdev)
 		pr_err("Failed to allocate resources: %#x\n", rc);
 		goto fail;
 	}
+	set_bit(BNXT_RE_FLAG_RESOURCES_ALLOCATED, &rdev->flags);
 	rc = bnxt_re_init_res(rdev);
 	if (rc) {
 		pr_err("Failed to initialize resources: %#x\n", rc);
 		goto fail;
 	}
 
+	set_bit(BNXT_RE_FLAG_RESOURCES_INITIALIZED, &rdev->flags);
+
 	if (!rdev->is_virtfn) {
 		rc = bnxt_re_setup_qos(rdev);
 		if (rc)