Hi Marc,
On Wed, Jul 15, 2015 at 01:16:41PM +0100, Marc Zyngier wrote:
> Now that we can easily find which MSI domain a PCI device is
> using, use dev_get_msi_domain as a way to retrieve the information.
>
> The original code is still used as a fallback.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> ---
> drivers/pci/msi.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index ef4ec6e..c77fdaf 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -41,7 +41,8 @@ static struct irq_domain *pci_msi_get_domain(struct pci_dev *dev)
> {
> struct irq_domain *domain = NULL;
>
> - if (dev->bus->msi)
> + domain = dev_get_msi_domain(&dev->dev);
> + if (!domain && dev->bus->msi)
> domain = dev->bus->msi->domain;
> if (!domain)
> domain = arch_get_pci_msi_domain(dev);
I think this would be slightly easier to read as:
struct irq_domain *domain;
domain = dev_get_msi_domain(&dev->dev);
if (domain)
return domain;
if (dev->bus->msi && (domain = dev->bus->msi->domain))
return domain;
return arch_get_pci_msi_domain(dev);
I'm not a huge fan of assignments inside "if" conditions, and checkpatch
might even complain about it, but it exposes the fallback order pretty well
here. I guess we could also just repeat the dev->bus->msi->domain
expression:
if (dev->bus->msi && dev->bus->msi->domain)
return dev->bus->msi->domain;
We can at least get rid of the superfluous initialization of domain to
NULL.
Bjorn
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