From f02a4b8e6431598612466f76aac64ab492849abf Mon Sep 17 00:00:00 2001 From: Li Feng Date: Mon, 9 Oct 2023 12:47:01 +0800 Subject: vhost-user: fix lost reconnect When the vhost-user is reconnecting to the backend, and if the vhost-user fails at the get_features in vhost_dev_init(), then the reconnect will fail and it will not be retriggered forever. The reason is: When the vhost-user fails at get_features, the vhost_dev_cleanup will be called immediately. vhost_dev_cleanup calls 'memset(hdev, 0, sizeof(struct vhost_dev))'. The reconnect path is: vhost_user_blk_event vhost_user_async_close(.. vhost_user_blk_disconnect ..) qemu_chr_fe_set_handlers <----- clear the notifier callback schedule vhost_user_async_close_bh The vhost->vdev is null, so the vhost_user_blk_disconnect will not be called, then the event fd callback will not be reinstalled. All vhost-user devices have this issue, including vhost-user-blk/scsi. With this patch, if the vdev->vdev is null, the fd callback will still be reinstalled. Fixes: 71e076a07d ("hw/virtio: generalise CHR_EVENT_CLOSED handling") Signed-off-by: Li Feng Reviewed-by: Raphael Norwitz Message-Id: <20231009044735.941655-6-fengli@smartx.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/scsi/vhost-user-scsi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'hw/scsi/vhost-user-scsi.c') diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c index 258fba5c69..4486500cac 100644 --- a/hw/scsi/vhost-user-scsi.c +++ b/hw/scsi/vhost-user-scsi.c @@ -212,7 +212,8 @@ static void vhost_user_scsi_event(void *opaque, QEMUChrEvent event) case CHR_EVENT_CLOSED: /* defer close until later to avoid circular close */ vhost_user_async_close(dev, &vs->conf.chardev, &vsc->dev, - vhost_user_scsi_disconnect); + vhost_user_scsi_disconnect, + vhost_user_scsi_event); break; case CHR_EVENT_BREAK: case CHR_EVENT_MUX_IN: -- cgit 1.4.1