linux-kernel - Re: [URGENT - PATCH FOR 2.6.39] omap: iommu: Return IRQ_HANDLED in fault handler when no fault occured

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Date:	Tue, 10 May 2011 14:39:56 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	linux-omap@...r.kernel.org, David Cohen <dacohen@...il.com>,
	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [URGENT - PATCH FOR 2.6.39] omap: iommu: Return IRQ_HANDLED in fault handler when no fault occured

Hi Tony,

On Friday 29 April 2011 12:03:10 Laurent Pinchart wrote:
> Hi Tony,
> 
> On Wednesday 27 April 2011 16:03:02 Laurent Pinchart wrote:
> > The iommu shares an interrupt line with the OMAP3 ISP. The iommu
> > interrupt handler must check the fault status and return IRQ_HANDLED
> > when no fault occured.
> > 
> > Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
> Could you please pick this one up for 2.6.39 ? As far as I know David is on
> holidays so he might not be able to review the patch before the 2.6.39
> release.

Ping. Please.

> > ---
> > 
> >  arch/arm/plat-omap/iommu.c |    2 ++
> >  1 files changed, 2 insertions(+), 0 deletions(-)
> > 
> > The OMAP3 ISP IOMMU got broken in 2.6.39-rc1 by
> > 
> > commit d594f1f31afe13edd8c02f3854a65cc58cfb3b74
> > Author: David Cohen <dacohen@...il.com>
> > Date:   Wed Feb 16 19:35:51 2011 +0000
> > 
> >     omap: IOMMU: add support to callback during fault handling
> >     
> >     Add support to register an isr for IOMMU fault situations and adapt
> >     it to allow such (*isr)() to be used as fault callback. Drivers
> >     using
> > 
> > IOMMU module might want to be informed when errors happen in order to
> > debug it or react.
> > 
> >     Signed-off-by: David Cohen <dacohen@...il.com>
> >     Acked-by: Hiroshi DOYU <Hiroshi.DOYU@...ia.com>
> >     Signed-off-by: Tony Lindgren <tony@...mide.com>
> > 
> > This patch fixes it and should be pushed to mainline in 2.6.39. The OMAP3
> > ISP driver, new in 2.6.39, would otherwise be totally broken until
> > 2.6.40.
> > 
> > diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c
> > index 8a51fd5..34fc31e 100644
> > --- a/arch/arm/plat-omap/iommu.c
> > +++ b/arch/arm/plat-omap/iommu.c
> > @@ -793,6 +793,8 @@ static irqreturn_t iommu_fault_handler(int irq, void
> > *data) clk_enable(obj->clk);
> > 
> >  	errs = iommu_report_fault(obj, &da);
> >  	clk_disable(obj->clk);
> > 
> > +	if (errs == 0)
> > +		return IRQ_HANDLED;
> > 
> >  	/* Fault callback or TLB/PTE Dynamic loading */
> >  	if (obj->isr && !obj->isr(obj, da, errs, obj->isr_priv))

-- 
Regards,

Laurent Pinchart
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