[PATCH 1/2] net/iavf: fix missing check for interrupt errors

[Bruce Richardson <bruce.richardson@intel.com>]

When registering interrupts, there was no check if the registration of
the interrupt succeeded. Add in such a check, and go to fallback path
if the check fails. This prevents errors on FreeBSD due to missed
admin queue messages.

Fixes: cd3b124955d4 ("net/iavf: enable interrupt polling")
Cc: stable@dpdk.org

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 drivers/net/intel/iavf/iavf_ethdev.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/net/intel/iavf/iavf_ethdev.c b/drivers/net/intel/iavf/iavf_ethdev.c
index 9cd2b0c867..1ab84b0bfc 100644
--- a/drivers/net/intel/iavf/iavf_ethdev.c
+++ b/drivers/net/intel/iavf/iavf_ethdev.c
@@ -2825,18 +2825,16 @@ iavf_dev_init(struct rte_eth_dev *eth_dev)
 			&eth_dev->data->mac_addrs[0]);
 
 
-	if (vf->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_WB_ON_ITR) {
-		/* register callback func to eal lib */
-		rte_intr_callback_register(pci_dev->intr_handle,
-					   iavf_dev_interrupt_handler,
-					   (void *)eth_dev);
+	if (vf->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_WB_ON_ITR &&
+			/* register callback func to eal lib */
+			rte_intr_callback_register(pci_dev->intr_handle,
+				   iavf_dev_interrupt_handler, (void *)eth_dev) == 0)
 
 		/* enable uio intr after callback register */
 		rte_intr_enable(pci_dev->intr_handle);
-	} else {
+	else
 		rte_eal_alarm_set(IAVF_ALARM_INTERVAL,
 				  iavf_dev_alarm_handler, eth_dev);
-	}
 
 	/* configure and enable device interrupt */
 	iavf_enable_irq0(hw);
-- 
2.43.0