diff options
Diffstat (limited to 'kernel/irq/msi.c')
-rw-r--r-- | kernel/irq/msi.c | 45 |
1 files changed, 21 insertions, 24 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index b511dc1a0219..09f34e17e891 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -731,43 +731,40 @@ int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev, } int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev, - int virq, int nvec, msi_alloc_info_t *arg) + int virq_base, 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; + int ret, virq; - 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; + msi_lock_descs(dev); + for (virq = virq_base; virq < virq_base + nvec; virq++) { + desc = alloc_msi_entry(dev, 1, NULL); + if (!desc) { + ret = -ENOMEM; + goto fail; } - if (!(desc->irq >= virq && desc->irq < (virq + nvec))) - continue; + desc->msi_index = virq; + desc->irq = virq; + list_add_tail(&desc->list, &dev->msi.data->list); ops->set_desc(arg, desc); - /* Assumes the domain mutex is held! */ - ret = irq_domain_alloc_irqs_hierarchy(domain, desc->irq, 1, - arg); + ret = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg); if (ret) - break; - - irq_set_msi_desc_off(desc->irq, 0, desc); - } - - if (ret) { - /* Mop up the damage */ - for_each_msi_entry(desc, dev) { - if (!(desc->irq >= virq && desc->irq < (virq + nvec))) - continue; + goto fail; - irq_domain_free_irqs_common(domain, desc->irq, 1); - } + irq_set_msi_desc(virq, desc); } + msi_unlock_descs(dev); + return 0; +fail: + for (--virq; virq >= virq_base; virq--) + irq_domain_free_irqs_common(domain, virq, 1); + msi_free_msi_descs_range(dev, MSI_DESC_ALL, virq_base, virq_base + nvec - 1); + msi_unlock_descs(dev); return ret; } |