linux-kernel - Re: [PATCH 05/15] powerpc/powernv: Split out set MSI IRQ chip code

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Date:	Mon, 22 Sep 2014 14:31:50 +1000
From:	Michael Neuling <mikey@...ling.org>
To:	Gavin Shan <gwshan@...ux.vnet.ibm.com>
Cc:	greg@...ah.com, arnd@...db.de, mpe@...erman.id.au,
	benh@...nel.crashing.org, cbe-oss-dev@...ts.ozlabs.org,
	imunsie@....ibm.com, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, jk@...abs.org, anton@...ba.org
Subject: Re: [PATCH 05/15] powerpc/powernv: Split out set MSI IRQ chip code

> >+static void set_msi_irq_chip(struct pnv_phb *phb, unsigned int virq)
> >+{
> >+	struct irq_data *idata;
> >+	struct irq_chip *ichip;
> >+
> >+	/*
> >+	 * Change the IRQ chip for the MSI interrupts on PHB3.
> >+	 * The corresponding IRQ chip should be populated for
> >+	 * the first time.
> >+	 */
> >+	if (phb->type == PNV_PHB_IODA2) {
> >+		if (!phb->ioda.irq_chip_init) {
> >+			idata = irq_get_irq_data(virq);
> >+			ichip = irq_data_get_irq_chip(idata);
> >+			phb->ioda.irq_chip_init = 1;
> >+			phb->ioda.irq_chip = *ichip;
> >+			phb->ioda.irq_chip.irq_eoi = pnv_ioda2_msi_eoi;
> >+		}
> >+
> >+		irq_set_chip(virq, &phb->ioda.irq_chip);
> >+	}
> >+}
> >+
> 
> Nitpick: to check PHB type and bail early could avoid nested code :)
> 
> 	if (phb->type != PNV_PHB_IODA2)
> 		return;

OK, will do in repost.

Thanks,
Mikey

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