In some situations, when a virtual machine is starting,
vring_state_changed can be called while there was no change in the
queue state. This fix makes sure that there was really a change in the
queue state before calling the callback for EVENT_QUEUE_STATE.
Fixes: ee584e9710b9 ("vhost: add driver on top of the library")
Cc: [email protected]
Signed-off-by: Noa Ezra <[email protected]>
Reviewed-by: Matan Azrad <[email protected]>
---
v2 remove checkpatch warnings
---
drivers/net/vhost/rte_eth_vhost.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/vhost/rte_eth_vhost.c
b/drivers/net/vhost/rte_eth_vhost.c
index cad1e5c..fbe7a37 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -855,6 +855,10 @@ struct vhost_xstats_name_off {
/* won't be NULL */
state = vring_states[eth_dev->data->port_id];
rte_spinlock_lock(&state->lock);
+ if (state->cur[vring] == enable) {
+ rte_spinlock_unlock(&state->lock);
+ return 0;
+ }
state->cur[vring] = enable;
state->max_vring = RTE_MAX(vring, state->max_vring);
--
1.8.3.1
