lkml.org 
[lkml]   [2017]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v2] irqchip/mips-gic: Add missing shared interrupt handler
Date
Hello,

On Thursday, 6 July 2017 05:03:59 PDT Thomas Gleixner wrote:
> On Thu, 6 Jul 2017, jrjang@gmail.com wrote:
>
> CC+ MIPS folks. There is a reason WHY I added them to my previous reply.

Thanks Thomas.

> > From: Jun-Ru Chang <jrjang@gmail.com>
> >
> > Commit b87281e7f205 ("irqchip/mips-gic: Remove device IRQ domain")
> > removes the device IRQ domain and uses gic_irq_domain_alloc() to
> > allocate the shared/local domain. However, the shared interrupt handler
> > is not set after allocating. It causes that the system hangs with
> > "unexpected IRQ" messages disaply.

I don't see the driver doing irq_set_handler(..., handle_level_irq) for device
interrupts prior to b87281e7f205 ("irqchip/mips-gic: Remove device IRQ
domain"), so I'm confused about 1) why this is a problem given that we don't
see it on our systems and 2) why you point the finger at that commit.

What system are you using?

I presume it's a device interrupt you're seeing issues with? How are you using
it? Via device tree or otherwise?

Can you provide directions to reproduce this problem?

> > And commit 8ada00a650ec ("irqchip/mips-gic: Replace static map with
> > dynamic") renames gic_irq_domain_alloc() to gic_irq_domain_map() to set
> > up the handler and chip. Fix this by setting the handle_level_irq
> > handler for shared interrupts.

I also don't understand from this why that commit is relevant either. That
commit didn't remove any calls to irq_set_handler, which is what your patch
adds. You outline above some of what 8ada00a650ec ("irqchip/mips-gic: Replace
static map with dynamic") does, but not why it's a problem. It's difficult to
see why you think it needs fixing if you don't describe why you think it's
broken.

Thanks,
Paul

> >
> > Fixes: b87281e7f205 ("irqchip/mips-gic: Remove device IRQ domain")
> > Signed-off-by: Jun-Ru Chang <jrjang@gmail.com>
> > ---
> > Change in v2:
> > - changed commit message
> >
> > drivers/irqchip/irq-mips-gic.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/irqchip/irq-mips-gic.c
> > b/drivers/irqchip/irq-mips-gic.c index 929f8558bf1c..0a5fb30deb17 100644
> > --- a/drivers/irqchip/irq-mips-gic.c
> > +++ b/drivers/irqchip/irq-mips-gic.c
> > @@ -716,6 +716,7 @@ static int gic_irq_domain_map(struct irq_domain *d,
> > unsigned int virq,>
> > if (err)
> >
> > return err;
> >
> > + irq_set_handler(virq, handle_level_irq);
> >
> > return gic_shared_irq_domain_map(d, virq, hwirq, 0);
> >
> > }

[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2017-07-06 18:38    [W:0.043 / U:12.864 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site