[dpdk-stable] patch 'net/mlx4: fix minor resource leak during init' has been queued to stable release 18.05.1

[Christian Ehrhardt <christian.ehrhardt@canonical.com>]

Hi,

FYI, your patch has been queued to stable release 18.05.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/01/18. So please
shout if anyone has objections.

Thanks.

Christian Ehrhardt <christian.ehrhardt@canonical.com>

---
>From 9afac427152c69e97ec2113aad3dd7cc5c47156b Mon Sep 17 00:00:00 2001
From: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Date: Tue, 22 May 2018 17:36:59 +0200
Subject: [PATCH] net/mlx4: fix minor resource leak during init

[ upstream commit 66f2ac0f8b857d880185fa32ba7229181be4d536 ]

Temporary IB device context and list are not freed in case of a successful
initialization of the device.

This issue is caused by the two following commits, the first of which
causes initialization to return early, while the second one goes a bit
overboard while switching to negative errno values; an internal variable
(err) is needed to tell success from failure at the end of the function
since rte_errno is not reliable enough.

Fixes: f2318196c71a ("net/mlx4: remove limitation on number of instances")
Fixes: 9d14b27308a0 ("net/mlx4: standardize on negative errno values")

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
 drivers/net/mlx4/mlx4.c | 37 +++++++++++++++++++------------------
 1 file changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index a29814b3b..d151a9055 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -575,14 +575,14 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 	ibv_dev = list[i];
 	DEBUG("device opened");
 	if (mlx4_glue->query_device(attr_ctx, &device_attr)) {
-		rte_errno = ENODEV;
+		err = ENODEV;
 		goto error;
 	}
 	INFO("%u port(s) detected", device_attr.phys_port_cnt);
 	conf.ports.present |= (UINT64_C(1) << device_attr.phys_port_cnt) - 1;
 	if (mlx4_args(pci_dev->device.devargs, &conf)) {
 		ERROR("failed to process device arguments");
-		rte_errno = EINVAL;
+		err = EINVAL;
 		goto error;
 	}
 	/* Use all ports when none are defined */
@@ -590,7 +590,7 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 		conf.ports.enabled = conf.ports.present;
 	/* Retrieve extended device attributes. */
 	if (mlx4_glue->query_device_ex(attr_ctx, NULL, &device_attr_ex)) {
-		rte_errno = ENODEV;
+		err = ENODEV;
 		goto error;
 	}
 	assert(device_attr.max_sge >= MLX4_MAX_SGE);
@@ -609,18 +609,18 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 		DEBUG("using port %u", port);
 		ctx = mlx4_glue->open_device(ibv_dev);
 		if (ctx == NULL) {
-			rte_errno = ENODEV;
+			err = ENODEV;
 			goto port_error;
 		}
 		/* Check port status. */
 		err = mlx4_glue->query_port(ctx, port, &port_attr);
 		if (err) {
-			rte_errno = err;
-			ERROR("port query failed: %s", strerror(rte_errno));
+			err = ENODEV;
+			ERROR("port query failed: %s", strerror(err));
 			goto port_error;
 		}
 		if (port_attr.link_layer != IBV_LINK_LAYER_ETHERNET) {
-			rte_errno = ENOTSUP;
+			err = ENOTSUP;
 			ERROR("port %d is not configured in Ethernet mode",
 			      port);
 			goto port_error;
@@ -630,15 +630,16 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 			      port, mlx4_glue->port_state_str(port_attr.state),
 			      port_attr.state);
 		/* Make asynchronous FD non-blocking to handle interrupts. */
-		if (mlx4_fd_set_non_blocking(ctx->async_fd) < 0) {
+		err = mlx4_fd_set_non_blocking(ctx->async_fd);
+		if (err) {
 			ERROR("cannot make asynchronous FD non-blocking: %s",
-			      strerror(rte_errno));
+			      strerror(err));
 			goto port_error;
 		}
 		/* Allocate protection domain. */
 		pd = mlx4_glue->alloc_pd(ctx);
 		if (pd == NULL) {
-			rte_errno = ENOMEM;
+			err = ENOMEM;
 			ERROR("PD allocation failure");
 			goto port_error;
 		}
@@ -647,7 +648,7 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 				   sizeof(*priv),
 				   RTE_CACHE_LINE_SIZE);
 		if (priv == NULL) {
-			rte_errno = ENOMEM;
+			err = ENOMEM;
 			ERROR("priv allocation failure");
 			goto port_error;
 		}
@@ -677,9 +678,10 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 		DEBUG("FCS stripping toggling is %ssupported",
 		      priv->hw_fcs_strip ? "" : "not ");
 		/* Configure the first MAC address by default. */
-		if (mlx4_get_mac(priv, &mac.addr_bytes)) {
+		err = mlx4_get_mac(priv, &mac.addr_bytes);
+		if (err) {
 			ERROR("cannot get MAC address, is mlx4_en loaded?"
-			      " (rte_errno: %s)", strerror(rte_errno));
+			      " (error: %s)", strerror(err));
 			goto port_error;
 		}
 		INFO("port %u MAC address is %02x:%02x:%02x:%02x:%02x:%02x",
@@ -712,8 +714,8 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 			eth_dev = rte_eth_dev_allocate(name);
 		}
 		if (eth_dev == NULL) {
+			err = ENOMEM;
 			ERROR("can not allocate rte ethdev");
-			rte_errno = ENOMEM;
 			goto port_error;
 		}
 		eth_dev->data->dev_private = priv;
@@ -776,8 +778,6 @@ port_error:
 			rte_eth_dev_release_port(eth_dev);
 		break;
 	}
-	if (i == device_attr.phys_port_cnt)
-		return 0;
 	/*
 	 * XXX if something went wrong in the loop above, there is a resource
 	 * leak (ctx, pd, priv, dpdk ethdev) but we can do nothing about it as
@@ -789,8 +789,9 @@ error:
 		claim_zero(mlx4_glue->close_device(attr_ctx));
 	if (list)
 		mlx4_glue->free_device_list(list);
-	assert(rte_errno >= 0);
-	return -rte_errno;
+	if (err)
+		rte_errno = err;
+	return -err;
 }
 
 static const struct rte_pci_id mlx4_pci_id_map[] = {
-- 
2.17.1