linux-kernel - RE: [PATCH v8] PCI: Xilinx-NWL-PCIe: Added support for Xilinx NWL PCIe Host Controller

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Date:	Tue, 17 Nov 2015 05:01:54 +0000
From:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:	Ray Jui <rjui@...adcom.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	Michal Simek <michals@...inx.com>,
	Soren Brinkmann <sorenb@...inx.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"tinamdar@....com" <tinamdar@....com>,
	"treding@...dia.com" <treding@...dia.com>,
	"Minghuan.Lian@...escale.com" <Minghuan.Lian@...escale.com>,
	"m-karicheri2@...com" <m-karicheri2@...com>,
	"hauke@...ke-m.de" <hauke@...ke-m.de>,
	"marc.zyngier@....com" <marc.zyngier@....com>,
	"dhdang@....com" <dhdang@....com>,
	"sbranden@...adcom.com" <sbranden@...adcom.com>
CC:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Ravikiran Gummaluri <rgummal@...inx.com>
Subject: RE: [PATCH v8] PCI: Xilinx-NWL-PCIe: Added support for Xilinx NWL
 PCIe Host Controller

 
> On 11/10/2015 10:33 PM, Bharat Kumar Gogada wrote:
> > Adding PCIe Root Port driver for Xilinx PCIe NWL bridge IP.
> >
> > Signed-off-by: Bharat Kumar Gogada <bharatku@...inx.com>
> > Signed-off-by: Ravi Kiran Gummaluri <rgummal@...inx.com>
> > ---
> > Added logic to allocate contiguous hwirq in nwl_irq_domain_alloc function.
> > Moved MSI functionality to separate functions.
> > Changed error return values.
> > +static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int
> virq,
> > +				unsigned int nr_irqs, void *args) {
> > +	struct nwl_pcie *pcie = domain->host_data;
> > +	struct nwl_msi *msi = &pcie->msi;
> > +	unsigned long bit;
> > +	int i;
> > +
> > +	mutex_lock(&msi->lock);
> > +	for (i = 0; i < nr_irqs; i++) {
> > +		bit = find_first_zero_bit(msi->used, INT_PCI_MSI_NR);
> > +		if (bit < INT_PCI_MSI_NR)
> > +			set_bit(bit, msi->used);
> > +		else
> > +			bit = -ENOSPC;
> 
> Don't you get a compiler warning with this? Note bit is unsigned long and you
> assign -ENOSPC to it.
> 
Ya that's a mistake, I will address these in next patch.
> > +
> > +		if (bit < 0) {
> 
> how can bit < 0 if it's unsigned long?
> 
> > +			mutex_unlock(&msi->lock);
> > +			return bit;
> > +		}
> > +
> > +		irq_domain_set_info(domain, virq, bit, &nwl_irq_chip,
> > +				domain->host_data, handle_simple_irq,
> > +				NULL, NULL);
> 
> nit, but if you do irq_domain_set_info(domain, virq + i, ...
> 
> then you can get rid of the code below.
> 
> > +		virq = virq + 1;
> > +	}
> > +	mutex_unlock(&msi->lock);
> > +	return 0;
> > +}
> > +

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