[dpdk-dev] [PATCH v2] i40evf: fix return value if command fails

[Jingjing Wu <jingjing.wu@intel.com>]

Previously, if message is sent successfully, but no response is
received, function "i40evf_execute_vf_cmd" will return without error.
The root cause is value "err" is overwritten. This patch fixes it.

Fixes: ae19955e7c86 ("i40evf: support reporting PF reset")
Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
---
v2 changes:
 set default err value for each case in switch.

 drivers/net/i40e/i40e_ethdev_vf.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 90682ac..c6efa1a 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -330,8 +330,7 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev, struct vf_cmd_info *args)
 	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
 	struct i40evf_arq_msg_info info;
 	enum i40evf_aq_result ret;
-	int err = -1;
-	int i = 0;
+	int err, i = 0;
 
 	if (_atomic_set_cmd(vf, args->ops))
 		return -1;
@@ -352,19 +351,19 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev, struct vf_cmd_info *args)
 	switch (args->ops) {
 	case I40E_VIRTCHNL_OP_RESET_VF:
 		/*no need to process in this function */
+		err = 0;
 		break;
 	case I40E_VIRTCHNL_OP_VERSION:
 	case I40E_VIRTCHNL_OP_GET_VF_RESOURCES:
 		/* for init adminq commands, need to poll the response */
+		err = -1;
 		do {
 			ret = i40evf_read_pfmsg(dev, &info);
 			if (ret == I40EVF_MSG_CMD) {
 				err = 0;
 				break;
-			} else if (ret == I40EVF_MSG_ERR) {
-				err = -1;
+			} else if (ret == I40EVF_MSG_ERR)
 				break;
-			}
 			rte_delay_ms(ASQ_DELAY_MS);
 			/* If don't read msg or read sys event, continue */
 		} while (i++ < MAX_TRY_TIMES);
@@ -373,6 +372,7 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev, struct vf_cmd_info *args)
 
 	default:
 		/* for other adminq in running time, waiting the cmd done flag */
+		err = -1;
 		do {
 			if (vf->pend_cmd == I40E_VIRTCHNL_OP_UNKNOWN) {
 				err = 0;
-- 
2.4.0