> 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@xxxxxxxxxx>
> > Signed-off-by: Ravi Kiran Gummaluri <rgummal@xxxxxxxxxx>
> > ---
> > 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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