[PATCH 05/15] PCI: mvebu: Disallow mapping interrupts on emulated bridges

From: "Pali Rohár" <pali@kernel.org>
To: "Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
	"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
	"Rob Herring" <robh@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Marek Behún" <kabel@kernel.org>
Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 05/15] PCI: mvebu: Disallow mapping interrupts on emulated bridges
Date: Thu, 25 Nov 2021 13:45:55 +0100	[thread overview]
Message-ID: <20211125124605.25915-6-pali@kernel.org> (raw)
In-Reply-To: <20211125124605.25915-1-pali@kernel.org>

Interrupt support on mvebu emulated bridges is not implemented yet.

So properly indicate return value to callers that they cannot request
interrupts from emulated bridge.

Signed-off-by: Pali Rohár <pali@kernel.org>
Cc: stable@vger.kernel.org
---
 drivers/pci/controller/pci-mvebu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 19c6ee298442..a3df352d440e 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -705,6 +705,15 @@ static struct pci_ops mvebu_pcie_ops = {
 	.write = mvebu_pcie_wr_conf,
 };
 
+static int mvebu_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	/* Interrupt support on mvebu emulated bridges is not implemented yet */
+	if (dev->bus->number == 0)
+		return 0; /* Proper return code 0 == NO_IRQ */
+
+	return of_irq_parse_and_map_pci(dev, slot, pin);
+}
+
 static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
 						 const struct resource *res,
 						 resource_size_t start,
@@ -1119,6 +1128,7 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
 	bridge->sysdata = pcie;
 	bridge->ops = &mvebu_pcie_ops;
 	bridge->align_resource = mvebu_pcie_align_resource;
+	bridge->map_irq = mvebu_pcie_map_irq;
 
 	return pci_host_probe(bridge);
 }
-- 
2.20.1

