A deadlock happens when handling VHOST_USER_RESET_OWNER request for the same reason the lock is not taken for VHOST_USER_GET_VRING_BASE.
It is safe not to take the lock, as the queues are no more used by the application when the virtqueues and the device are reset. Fixes: a3688046995f ("vhost: protect active rings from async ring changes") Cc: sta...@dpdk.org Cc: Victor Kaplansky <vict...@redhat.com> Reviewed-by: Tiwei Bie <tiwei....@intel.com> Reviewed-by: Jianfeng Tan <jianfeng....@intel.com> Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com> --- lib/librte_vhost/vhost_user.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c index 65ee33919..90ed2112e 100644 --- a/lib/librte_vhost/vhost_user.c +++ b/lib/librte_vhost/vhost_user.c @@ -1348,16 +1348,16 @@ vhost_user_msg_handler(int vid, int fd) } /* - * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE, - * since it is sent when virtio stops and device is destroyed. - * destroy_device waits for queues to be inactive, so it is safe. - * Otherwise taking the access_lock would cause a dead lock. + * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE + * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops + * and device is destroyed. destroy_device waits for queues to be + * inactive, so it is safe. Otherwise taking the access_lock + * would cause a dead lock. */ switch (msg.request.master) { case VHOST_USER_SET_FEATURES: case VHOST_USER_SET_PROTOCOL_FEATURES: case VHOST_USER_SET_OWNER: - case VHOST_USER_RESET_OWNER: case VHOST_USER_SET_MEM_TABLE: case VHOST_USER_SET_LOG_BASE: case VHOST_USER_SET_LOG_FD: -- 2.14.3