Re: [PATCH] xen/blkback: Check for insane amounts of request on the ring.

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Thu, Jun 06, 2013 at 12:47:35PM +0100, Jan Beulich wrote:
> >>> On 05.06.13 at 19:35, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> wrote:
> > @@ -230,6 +231,7 @@ static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page,
> >  static void xen_blkif_disconnect(struct xen_blkif *blkif)
> >  {
> >  	if (blkif->xenblkd) {
> > +		wake_up(&blkif->shutdown_wq);
> >  		kthread_stop(blkif->xenblkd);
> >  		blkif->xenblkd = NULL;
> >  	}
> 
> Btw., wouldn't the wake_up() better be done after the kthread_stop(),
> so that when the corresponding wait_event_interruptible() checks
> whether to exit the terminating kthread_should_stop() is guaranteed
> to evaluate to true (otherwise I think there's potential for it to never
> exit)?

I think you are right. I did the change and the tests were OK.
> 
> Jan
>