linux-kernel - Re: [PATCH] genirq: use irq_mask as fallback for irq

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Date:	Tue, 23 Apr 2013 14:46:16 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Andreas Fenkart <andreas.fenkart@...eamunlimited.com>,
	zonque@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] genirq: use irq_mask as fallback for irq_disable.

On Mon, 22 Apr 2013, Andrew Morton wrote:

> On Fri, 19 Apr 2013 15:41:02 +0200 Andreas Fenkart <andreas.fenkart@...eamunlimited.com> wrote:
> 
> > This is in line with irq_enable that uses the same fallback.
> > When masked, interrupts are still latched into the status register
> > so when unmasked there is an interrupt straight away.
> > 
> > ...
> >
> > --- a/kernel/irq/chip.c
> > +++ b/kernel/irq/chip.c
> > @@ -216,10 +216,11 @@ void irq_enable(struct irq_desc *desc)
> >  void irq_disable(struct irq_desc *desc)
> >  {
> >  	irq_state_set_disabled(desc);
> > -	if (desc->irq_data.chip->irq_disable) {
> > +	if (desc->irq_data.chip->irq_disable)
> >  		desc->irq_data.chip->irq_disable(&desc->irq_data);
> > -		irq_state_set_masked(desc);
> > -	}
> > +	else
> > +		desc->irq_data.chip->irq_mask(&desc->irq_data);
> > +	irq_state_set_masked(desc);
> >  }
> >  
> >  void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
> 
> Well I hope Thomas knows what this patch does, because I sure don't.

I know what it does, but the changelog is completely useless.
 
> Does it fix a bug?  Does it add a bug?  Does it have any
> runtime-observable effects at all?  If so, what are they?

It fixes a state inconsistency. Have to think about observable
effects.

Thanks

	tglx

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