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Message-ID: <5106634A.2000308@citrix.com> Date: Mon, 28 Jan 2013 11:38:50 +0000 From: David Vrabel <david.vrabel@...rix.com> To: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> CC: <linux-kernel@...r.kernel.org>, <xen-devel@...ts.xensource.com>, Konrad Rzeszutek Wilk <konrad@...nel.org>, <stable@...r.kernel.org> Subject: Re: [Xen-devel] [PATCH 3/3] xen/blkback: Check for insane amounts of request on the ring. On 25/01/13 18:43, Konrad Rzeszutek Wilk wrote: > > Check that the ring does not have an insane amount of requests > (more than there could fit on the ring). [...] > --- a/drivers/block/xen-blkback/blkback.c > +++ b/drivers/block/xen-blkback/blkback.c [...] > @@ -415,8 +415,12 @@ int xen_blkif_schedule(void *arg) > blkif->waiting_reqs = 0; > smp_mb(); /* clear flag *before* checking for work */ > > - if (do_block_io_op(blkif)) > + rc = do_block_io_op(blkif); > + if (rc > 0) > blkif->waiting_reqs = 1; > + if (rc == -EACCES) > + wait_event_interruptible(blkif->shutdown_wq, > + kthread_should_stop()); So if this happens then the backend silently stops processing any further requests? I think it should print an error and disconnect from the front end. David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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