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

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Date:   Thu, 26 Oct 2023 01:53:28 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-serial@...r.kernel.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Anup Patel <anup@...infault.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Atish Kumar Patra <atishp@...osinc.com>,
        Haibo Xu <haibo1.xu@...el.com>,
        Sunil V L <sunilvl@...tanamicro.com>
Subject: [RFC PATCH v2 05/21] pnp.h: Return -EPROBE_DEFER for disabled IRQ resource in pnp_irq()

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@...tanamicro.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