[PATCH v2 5/7] net/ena: fix unhandled interrupt config failure

[Shai Brandes <shaibran@amazon.com>]

Fixed the device initialization routine to correctly handle
failure during the registration or enabling of interrupts
when operating in control path interrupt mode.

Fixes: ca1dfa85f0d3 ("net/ena: add control path pure polling mode")
Cc: stable@dpdk.org
Signed-off-by: Shai Brandes <shaibran@amazon.com>
Reviewed-by: Amit Bernstein <amitbern@amazon.com>
Reviewed-by: Yosef Raisman <yraisman@amazon.com>
---
 doc/guides/rel_notes/release_25_07.rst |  2 ++
 drivers/net/ena/ena_ethdev.c           | 20 ++++++++++++++++++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/doc/guides/rel_notes/release_25_07.rst b/doc/guides/rel_notes/release_25_07.rst
index 07b5feabc4..e7fecace4f 100644
--- a/doc/guides/rel_notes/release_25_07.rst
+++ b/doc/guides/rel_notes/release_25_07.rst
@@ -59,6 +59,8 @@ New Features
 
   * Added support for enabling fragment bypass mode for egress packets.
     This mode bypasses the PPS limit enforced by EC2 for fragmented egress packets on every ENI.
+  * Fixed the device initialization routine to correctly handle failure during the registration
+    or enabling of interrupts when operating in control path interrupt mode.
 
 * **Added Mucse rnp net driver.**
 
diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 4caad9006e..f26f08ca85 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -2465,8 +2465,16 @@ static int eth_ena_dev_init(struct rte_eth_dev *eth_dev)
 
 	if (!adapter->control_path_poll_interval) {
 		/* Control path interrupt mode */
-		rte_intr_callback_register(intr_handle, ena_control_path_handler, eth_dev);
-		rte_intr_enable(intr_handle);
+		rc = rte_intr_callback_register(intr_handle, ena_control_path_handler, eth_dev);
+		if (unlikely(rc < 0)) {
+			PMD_DRV_LOG_LINE(ERR, "Failed to register control path interrupt");
+			goto err_stats_destroy;
+		}
+		rc = rte_intr_enable(intr_handle);
+		if (unlikely(rc < 0)) {
+			PMD_DRV_LOG_LINE(ERR, "Failed to enable control path interrupt");
+			goto err_control_path_destroy;
+		}
 		ena_com_set_admin_polling_mode(ena_dev, false);
 	} else {
 		/* Control path polling mode */
@@ -2485,6 +2493,14 @@ static int eth_ena_dev_init(struct rte_eth_dev *eth_dev)
 
 	return 0;
 err_control_path_destroy:
+	if (!adapter->control_path_poll_interval) {
+		rc = rte_intr_callback_unregister_sync(intr_handle,
+					ena_control_path_handler,
+					eth_dev);
+		if (unlikely(rc < 0))
+			PMD_INIT_LOG_LINE(ERR, "Failed to unregister interrupt handler");
+	}
+err_stats_destroy:
 	rte_free(adapter->drv_stats);
 err_indirect_table_destroy:
 	ena_indirect_table_release(adapter);
-- 
2.17.1