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

Pali Rohár
2021-11-25T12:49:04Z

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