Merge tag 'regulator-v4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...

[karo-tx-linux.git] / kernel / irq / msi.c

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 9a85613d4227a64e51ddfea4f6af1917c01d3cf8..15b249e7c67321007305d64bfcd2c69fd6206ddb 100644 (file)
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -266,6 +266,46 @@ int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
        return ret;
 }
 
+int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
+                            int virq, int nvec, msi_alloc_info_t *arg)
+{
+       struct msi_domain_info *info = domain->host_data;
+       struct msi_domain_ops *ops = info->ops;
+       struct msi_desc *desc;
+       int ret = 0;
+
+       for_each_msi_entry(desc, dev) {
+               /* Don't even try the multi-MSI brain damage. */
+               if (WARN_ON(!desc->irq || desc->nvec_used != 1)) {
+                       ret = -EINVAL;
+                       break;
+               }
+
+               if (!(desc->irq >= virq && desc->irq < (virq + nvec)))
+                       continue;
+
+               ops->set_desc(arg, desc);
+               /* Assumes the domain mutex is held! */
+               ret = irq_domain_alloc_irqs_recursive(domain, virq, 1, arg);
+               if (ret)
+                       break;
+
+               irq_set_msi_desc_off(virq, 0, desc);
+       }
+
+       if (ret) {
+               /* Mop up the damage */
+               for_each_msi_entry(desc, dev) {
+                       if (!(desc->irq >= virq && desc->irq < (virq + nvec)))
+                               continue;
+
+                       irq_domain_free_irqs_common(domain, desc->irq, 1);
+               }
+       }
+
+       return ret;
+}
+
 /**
  * msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain
  * @domain:    The domain to allocate from