rte_intr_callback_unregister() returns the number of unregistered
callbacks on success. Since the close operation started returning
the ret variable instead of 0, this positive value leaks as the
return value of i40e_dev_close(), so applications checking
rte_eth_dev_close() != 0 treat a successful close as a failure.

Fixes: 62024eb82756 ("ethdev: change stop operation callback to return int")
Cc: stable@dpdk.org
Signed-off-by: SidAli CHERRATI <redacted>
---
 drivers/net/intel/i40e/i40e_ethdev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/intel/i40e/i40e_ethdev.c b/drivers/net/intel/i40e/i40e_ethdev.c
index b6b2d291ee..2fe6b1e118 100644
--- a/drivers/net/intel/i40e/i40e_ethdev.c
+++ b/drivers/net/intel/i40e/i40e_ethdev.c

@@ -2764,6 +2764,7 @@ i40e_dev_close(struct rte_eth_dev *dev)
 		ret = rte_intr_callback_unregister(intr_handle,
 				i40e_dev_interrupt_handler, dev);
 		if (ret >= 0 || ret == -ENOENT) {
+			ret = 0;
 			break;
 		} else if (ret != -EAGAIN) {
 			PMD_INIT_LOG(ERR,

-- 
2.34.1