linux-kernel - Re: [Xen-devel] [PATCH 4/4] xen/events: Add WARN

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Date:	Fri, 25 May 2012 10:18:05 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: Re: [Xen-devel] [PATCH 4/4] xen/events: Add WARN_ON when quick lookup
 found invalid type.

On Thu, 24 May 2012, Konrad Rzeszutek Wilk wrote:
> On Thu, May 24, 2012 at 11:58:11AM +0100, Stefano Stabellini wrote:
> > On Wed, 23 May 2012, Konrad Rzeszutek Wilk wrote:
> > > All of the bind_XYZ_to_irq do a quick lookup to see if the
> > > event exists. And if they that value is returned instead of
> > 
> >                            ^
> 
> ... snip. How about this:
> 
> >From 5963cc2699db7b2893e7925bd2e68ada9d97e8ef Mon Sep 17 00:00:00 2001
> From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Date: Wed, 23 May 2012 13:28:44 -0400
> Subject: [PATCH] xen/events: Add WARN_ON when quick lookup found invalid
>  type.
> 
> All of the bind_XYZ_to_irq do a quick lookup to see if the
> event exists. And if it does, then the initialized IRQ number
> is returned instead of initializing a new IRQ number.
> 
> This patch adds an extra logic to check that the type returned
> is proper one and that there is an IRQ handler setup for it.
> 
> This patch has the benefit of being able to find drivers that
> are doing something naught.
> 
> [v1: Enhanced based on Stefano's review]
>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
>  drivers/xen/events.c |   11 +++++++++--
>  1 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/xen/events.c b/drivers/xen/events.c
> index faae2f9..81f338a 100644
> --- a/drivers/xen/events.c
> +++ b/drivers/xen/events.c
> @@ -827,6 +827,9 @@ int bind_evtchn_to_irq(unsigned int evtchn)
>  					      handle_edge_irq, "event");
>  
>  		xen_irq_info_evtchn_init(irq, evtchn);
> +	} else {
> +		struct irq_info *info = info_for_irq(irq);
> +		WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
>  	}
>  
>  out:
> @@ -862,8 +865,10 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
>  		xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
>  
>  		bind_evtchn_to_cpu(evtchn, cpu);
> +	} else {
> +		struct irq_info *info = info_for_irq(irq);
> +		WARN_ON(info == NULL || info->type != IRQT_IPI);
>  	}
> -
>   out:
>  	mutex_unlock(&irq_mapping_update_lock);
>  	return irq;
> @@ -939,8 +944,10 @@ int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
>  		xen_irq_info_virq_init(cpu, irq, evtchn, virq);
>  
>  		bind_evtchn_to_cpu(evtchn, cpu);
> +	} else {
> +		struct irq_info *info = info_for_irq(irq);
> +		WARN_ON(info == NULL || info->type != IRQT_VIRQ);
>  	}
> -
>  out:
>  	mutex_unlock(&irq_mapping_update_lock);
>  

I don't want to nitpick but you removed 2 out of 3 spaced before the out
label.
In any case:

Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
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