[PATCH v3 3/7] net/mana: fix PD resource leak on device close

[longli@linux.microsoft.com]

From: Long Li <longli@microsoft.com>

The Protection Domains (PDs) allocated during device initialization
were not being deallocated on device close, causing a resource leak.

Deallocate both ib_parent_pd and ib_pd in mana_dev_close() before
closing the IB device context. Log errors if deallocation fails,
which would indicate orphaned child resources (QPs, MRs). The close
proceeds regardless because ibv_close_device() will force kernel
cleanup of any remaining resources.

Fixes: 2f5749ead13a ("net/mana: add basic driver with build environment")
Cc: stable@dpdk.org

Signed-off-by: Long Li <longli@microsoft.com>
v3:
- No changes from v2 (was patch 4 in v2)

v2:
- Use local 'err' variable for ibv_dealloc_pd() return value to
  avoid shadowing the outer 'ret' from mana_dev_stop()
---
 drivers/net/mana/mana.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/net/mana/mana.c b/drivers/net/mana/mana.c
index b7ae01b152..67396cda1f 100644
--- a/drivers/net/mana/mana.c
+++ b/drivers/net/mana/mana.c
@@ -282,6 +282,20 @@ mana_dev_close(struct rte_eth_dev *dev)
 	if (ret)
 		return ret;
 
+	if (priv->ib_parent_pd) {
+		int err = ibv_dealloc_pd(priv->ib_parent_pd);
+		if (err)
+			DRV_LOG(ERR, "Failed to deallocate parent PD: %d", err);
+		priv->ib_parent_pd = NULL;
+	}
+
+	if (priv->ib_pd) {
+		int err = ibv_dealloc_pd(priv->ib_pd);
+		if (err)
+			DRV_LOG(ERR, "Failed to deallocate PD: %d", err);
+		priv->ib_pd = NULL;
+	}
+
 	ret = ibv_close_device(priv->ib_ctx);
 	if (ret) {
 		ret = errno;
-- 
2.43.0