vhost: initialize log eventfd context pointer

vq log eventfd context pointer needs to be initialized, otherwise
operation may fail or oops if log is enabled but log eventfd not set by
userspace.  When log_ctx for device is created, it is copied to the vq.
This reset was missing.

Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index db21518f7e8d4a66a5d22cb59c4c217352df2a58..6c31c0c9bbb9fb315d76ea807073eb8526648e3a 100644 (file)
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -121,6 +121,7 @@ static void vhost_vq_reset(struct vhost_dev *dev,
        vq->kick = NULL;
        vq->call_ctx = NULL;
        vq->call = NULL;
+       vq->log_ctx = NULL;
 }
 
 long vhost_dev_init(struct vhost_dev *dev,