[PATCH] raw/ntb: add check for DB intr handler registering

[Junfeng Guo <junfeng.guo@intel.com>]

The callback registering of doorbell interrupt handler should be
finished before enabling the interrupt event fd. Thus add the return
value check for this callback registering.

Fixes: 62012a76811e ("raw/ntb: add handshake process")
Cc: stable@dpdk.org

Signed-off-by: Junfeng Guo <junfeng.guo@intel.com>
---
 drivers/raw/ntb/ntb.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/raw/ntb/ntb.c b/drivers/raw/ntb/ntb.c
index cc611dfbb9..0801e6d1ae 100644
--- a/drivers/raw/ntb/ntb.c
+++ b/drivers/raw/ntb/ntb.c
@@ -1403,8 +1403,12 @@ ntb_init_hw(struct rte_rawdev *dev, struct rte_pci_device *pci_dev)
 
 	intr_handle = pci_dev->intr_handle;
 	/* Register callback func to eal lib */
-	rte_intr_callback_register(intr_handle,
-				   ntb_dev_intr_handler, dev);
+	ret = rte_intr_callback_register(intr_handle,
+					 ntb_dev_intr_handler, dev);
+	if (ret) {
+		NTB_LOG(ERR, "Unable to register doorbell intr handler.");
+		return ret;
+	}
 
 	ret = rte_intr_efd_enable(intr_handle, hw->db_cnt);
 	if (ret)
-- 
2.25.1