A number of irqchip implementations are (ab)using the irqdomain allocator by passing a fwnode that is neither a FWNODE_OF or a FWNODE_IRQCHIP.
This is pretty bad, but it also feels pretty crap to force these drivers to allocate their own irqchip_fwid when they already have a proper fwnode. Instead, let's teach the irqdomain allocator about ACPI device nodes, and add some lovely name generation code... Tested on an arm64 D05 system. Reported-by: John Garry <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> --- kernel/irq/irqdomain.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 14fe862aa2e3..71ed8a849345 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -1,5 +1,6 @@ #define pr_fmt(fmt) "irq: " fmt +#include <linux/acpi.h> #include <linux/debugfs.h> #include <linux/hardirq.h> #include <linux/interrupt.h> @@ -155,6 +156,21 @@ struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size, domain->name = fwid->name; break; } +#ifdef CONFIG_ACPI + } else if (is_acpi_device_node(fwnode)) { + struct acpi_buffer buf = { + .length = ACPI_ALLOCATE_BUFFER, + }; + acpi_handle handle; + + handle = acpi_device_handle(to_acpi_device_node(fwnode)); + if (acpi_get_name(handle, ACPI_FULL_PATHNAME, &buf) == AE_OK) { + domain->name = buf.pointer; + domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED; + } + + domain->fwnode = fwnode; +#endif } else if (of_node) { char *name; -- 2.11.0
