[dpdk-dev] [PATCH] kni: unregister an unregisterd net_device could cause a kernel crash

[zhouyangchao]

Signed-off-by: zhouyangchao <zhouyates at gmail.com>
---
 lib/librte_eal/linuxapp/kni/kni_misc.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c b/lib/librte_eal/linuxapp/kni/kni_misc.c
index 67e9b7d..ad4e603 100644
--- a/lib/librte_eal/linuxapp/kni/kni_misc.c
+++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
@@ -361,7 +361,9 @@ kni_dev_remove(struct kni_dev *dev)
 		igb_kni_remove(dev->pci_dev);
 
 	if (dev->net_dev) {
-		unregister_netdev(dev->net_dev);
+		if (dev->netdev->reg_state == NETREG_REGISTERED){
+			unregister_netdev(dev->net_dev);
+		}
 		free_netdev(dev->net_dev);
 	}
 
-- 
1.7.1