[RFC PATCH v2 05/21] pnp.h: Return -EPROBE_DEFER for disabled IRQ resource in pnp_irq()

Sunil V L
2023-10-25T20:24:40Z

To support deferred PNP driver probe, pnp_irq() must return -EPROBE_DEFER
so that the device driver can do deferred probe if the interrupt controller
is not probed early.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
include/linux/pnp.h | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index c2a7cfbca713..21cf833789fb 100644
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -147,12 +147,18 @@ static inline resource_size_t pnp_mem_len(struct pnp_dev *dev,
}

-static inline resource_size_t pnp_irq(struct pnp_dev *dev, unsigned int bar)
+static inline int pnp_irq(struct pnp_dev *dev, unsigned int bar)
{
struct resource *res = pnp_get_resource(dev, IORESOURCE_IRQ, bar);

- if (pnp_resource_valid(res))
+ if (pnp_resource_valid(res)) {
+#if IS_ENABLED(CONFIG_ARCH_ACPI_DEFERRED_GSI)
+ if (!pnp_resource_enabled(res))
+ return -EPROBE_DEFER;
+#endif
+
return res->start;
+ }
return -1;
}

--
2.39.2