[dpdk-dev] [PATCH 3/3] net/virtio: fix crash when number of virtio devices > 1

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

The vtpci_ops assignment needs the 'hw->port_id' as an input parameter.
That said, we should set 'hw->port_id' firstly, then do the vtpci_ops
assignment, while the code does reversely. That would result to a crash
when more than one virtio devices are used, because we keep assigning
proper vtpci_ops to virtio_hw_internal[0]->vtpci_ops, leaving the pointer
for other ports being NULL.

Reverse the order fixes this issue.

Fixes: 9470427c88e1 ("net/virtio: do not store PCI device pointer at shared memory")

Cc: stable@dpdk.org
Reported-by: Lei Yao <lei.a.yao@intel.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---
 drivers/net/virtio/virtio_ethdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 1d51942..68dde08 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1515,6 +1515,7 @@ static int virtio_dev_xstats_get_names(struct rte_eth_dev *dev,
 		return -ENOMEM;
 	}
 
+	hw->port_id = eth_dev->data->port_id;
 	/* For virtio_user case the hw->virtio_user_dev is populated by
 	 * virtio_user_eth_dev_alloc() before eth_virtio_dev_init() is called.
 	 */
@@ -1525,7 +1526,6 @@ static int virtio_dev_xstats_get_names(struct rte_eth_dev *dev,
 			return ret;
 	}
 
-	hw->port_id = eth_dev->data->port_id;
 	eth_dev->data->dev_flags = dev_flags;
 
 	/* reset device and negotiate default features */
-- 
1.9.0