linux-kernel - Re: [PATCH v3 1/4] genirq/irqdomain: Allow partial trimming of irq

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Message-ID: <875z7ipgcn.wl-maz@kernel.org>
Date:   Sat, 10 Oct 2020 10:42:16 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Venkat Reddy Talla <vreddytalla@...dia.com>,
        kernel-team@...roid.com
Subject: Re: [PATCH v3 1/4] genirq/irqdomain: Allow partial trimming of irq_data hierarchy

On Thu, 08 Oct 2020 21:47:29 +0100,
Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> On Thu, Oct 08 2020 at 14:06, Marc Zyngier wrote:
> > On 2020-10-08 12:22, Thomas Gleixner wrote:
> > Here's what I have now, with the pmc driver calling
> > irq_domain_disconnect_hierarchy() at the right spots.
> >
> >   static int irq_domain_alloc_irq_data(struct irq_domain *domain,
> > @@ -1362,11 +1442,16 @@ int __irq_domain_alloc_irqs(struct irq_domain 
> > *domain, int irq_base,
> >   		mutex_unlock(&irq_domain_mutex);
> >   		goto out_free_irq_data;
> >   	}
> > -	for (i = 0; i < nr_irqs; i++)
> > +	for (i = 0; i < nr_irqs; i++) {
> > +		ret = irq_domain_trim_hierarchy(virq + i);
> > +		if (ret)
> > +			break;
> >   		irq_domain_insert_irq(virq + i);
> 
> You can't do that in one go because in case of an error you leak the
> already inserted irqs. You need two loops.
> 
> 	for (i = 0; i < nr_irqs; i++) {
> 		ret = irq_domain_trim_hierarchy(virq + i);
> 		if (ret) {
>                 	mutex_unlock(&irq_domain_mutex);
> 			goto out_free_irq_data;
>         }
> 
> 	for (i = 0; i < nr_irqs; i++)
>    		irq_domain_insert_irq(virq + i);
> 
>   	mutex_unlock(&irq_domain_mutex);
> 	return virq;

Of course you are right. I'll fold that in.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.