linux-kernel - Re: [Xen-devel] [PATCH 4/9] xen/events: BUG() when we can't allocate our event->irq array.

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Date:	Mon, 3 Oct 2011 12:21:30 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Dan Carpenter <error27@...il.com>
Subject: Re: [Xen-devel] [PATCH 4/9] xen/events: BUG() when we can't allocate
 our event->irq array.

On Fri, Sep 30, 2011 at 08:55:53AM +0100, Ian Campbell wrote:
> On Thu, 2011-09-29 at 20:52 +0100, Konrad Rzeszutek Wilk wrote:
> > In case we can't allocate we are doomed. We should BUG_ON
> > instead of trying to dereference it later on.
> > 
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > ---
> >  drivers/xen/events.c |    2 ++
> >  1 files changed, 2 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/xen/events.c b/drivers/xen/events.c
> > index 7523719..5db04bf 100644
> > --- a/drivers/xen/events.c
> > +++ b/drivers/xen/events.c
> > @@ -1670,6 +1670,8 @@ void __init xen_init_IRQ(void)
> >  
> >  	evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
> >  				    GFP_KERNEL);
> > +	if (!evtchn_to_irq)
> > +		BUG();
> 
> AKA
> 	BUG_ON(!evtchn_to_irq);

Duh, I even say it in the description. Changed it to be BUG_ON.
> 
> but
> 
> Acked-by: Ian Campbell <ian.campbell@...rix.com>
> 
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