[dpdk-dev] [PATCH v2] net/tap: fix log loss when state fails to be restored

["Min Hu (Connor)" <humin29@huawei.com>]

From: Chengchang Tang <tangchengchang@huawei.com>

After restoring the remote states, the return value of ioctl() is not
checked. Therefore, users cannot know whether the remote state is
restored successfully.

This patch add log for restoring failure.

Fixes: 4810d3af8343 ("net/tap: restore state of remote device when closing")
Cc: stable@dpdk.org

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
---
v2:
* move the variable declaration.
---
 drivers/net/tap/rte_eth_tap.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 68baa18..854abf4 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -1133,8 +1133,11 @@ tap_dev_close(struct rte_eth_dev *dev)
 
 	if (internals->remote_if_index) {
 		/* Restore initial remote state */
-		ioctl(internals->ioctl_sock, SIOCSIFFLAGS,
+		int ret = ioctl(internals->ioctl_sock, SIOCSIFFLAGS,
 				&internals->remote_initial_flags);
+		if (ret)
+			TAP_LOG(ERR, "restore remote state failed: %d", ret);
+
 	}
 
 	rte_mempool_free(internals->gso_ctx_mp);
-- 
2.7.4