Re: [Qemu-devel] [PATCH] net: clean up network at qemu process termination

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Dec 11, 2012 at 09:45:54PM +0800, Amos Kong wrote:
> We don't clean up network if fails to parse "-device" parameters without
> calling net_cleanup(). I touch a problem, the tap device which is
> created by qemu-ifup script could not be removed by qemu-ifdown script.
> Some similar problems also exist in vl.c
> 
> In this patch, if network initialization successes, a cleanup function
> will be registered to be called at qemu process termination.
> 
> Signed-off-by: Amos Kong <akong@redhat.com>


If there are multiple net clients, this still leaves
the problem where one client is initialized,
the second one fails, and we exit without ifdown.

I think registering before net_init_clients
will fix this case but please do test.

> ---
>  vl.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/vl.c b/vl.c
> index a3ab384..842f987 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -3749,6 +3749,9 @@ int main(int argc, char **argv, char **envp)
>          exit(1);
>      }
>  
> +    /* clean up network at qemu process termination */
> +    atexit(&net_cleanup);
> +
>      /* init the bluetooth world */
>      if (foreach_device_config(DEV_BT, bt_parse))
>          exit(1);
> @@ -3999,7 +4002,6 @@ int main(int argc, char **argv, char **envp)
>      main_loop();
>      bdrv_close_all();
>      pause_all_vcpus();
> -    net_cleanup();
>      res_free();
>  
>      return 0;
> -- 
> 1.7.1