diff options
Diffstat (limited to 'drivers/irqchip/irq-msi-lib.c')
| -rw-r--r-- | drivers/irqchip/irq-msi-lib.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-msi-lib.c b/drivers/irqchip/irq-msi-lib.c index 908944009c21..d5eefc3d7215 100644 --- a/drivers/irqchip/irq-msi-lib.c +++ b/drivers/irqchip/irq-msi-lib.c @@ -112,6 +112,20 @@ bool msi_lib_init_dev_msi_info(struct device *dev, struct irq_domain *domain, */ if (!chip->irq_set_affinity && !(info->flags & MSI_FLAG_NO_AFFINITY)) chip->irq_set_affinity = msi_domain_set_affinity; + + /* + * If the parent domain insists on being in charge of masking, obey + * blindly. The interrupt is un-masked at the PCI level on startup + * and masked on shutdown to prevent rogue interrupts after the + * driver freed the interrupt. Not masking it at the PCI level + * speeds up operation for disable/enable_irq() as it avoids + * getting all the way out to the PCI device. + */ + if (info->flags & MSI_FLAG_PCI_MSI_MASK_PARENT) { + chip->irq_mask = irq_chip_mask_parent; + chip->irq_unmask = irq_chip_unmask_parent; + } + return true; } EXPORT_SYMBOL_GPL(msi_lib_init_dev_msi_info); |