[PATCH v3 3/9] PCI: keystone: Use hwirq to get the legacy IRQ number offset
From: Kishon Vijay Abraham I <hidden>
Date: 2019-02-13 13:27:43
Also in:
linux-pci, lkml
Subsystem:
pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Linus Torvalds
ks_pcie_legacy_irq_handler() uses 'virq' to get the IRQ number offset. This offset is used to get the correct IRQ_STATUS register corresponding to the IRQ line that raised the interrupt. There is no guarantee that 'virq' assigned for consecutive hardware IRQ will be contiguous. And this might get us an incorrect IRQ number offset. Fix it here by using 'hwirq' to get the IRQ number offset. Link: https://lkml.kernel.org/r/bb081d21-7c03-0357-4294-7e92d95d838c@arm.com Signed-off-by: Kishon Vijay Abraham I <redacted> --- drivers/pci/controller/dwc/pci-keystone.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index e8b1d8eca78e..d35ac712a9f8 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c@@ -87,7 +87,7 @@ struct keystone_pcie { struct dw_pcie *pci; /* PCI Device ID */ u32 device_id; - int legacy_host_irqs[PCI_NUM_INTX]; + int legacy_host_irq; struct device_node *legacy_intc_np; int msi_host_irqs[MAX_MSI_HOST_IRQS];
@@ -582,11 +582,11 @@ static void ks_pcie_msi_irq_handler(struct irq_desc *desc) */ static void ks_pcie_legacy_irq_handler(struct irq_desc *desc) { - unsigned int irq = irq_desc_get_irq(desc); + unsigned int irq = desc->irq_data.hwirq; struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc); struct dw_pcie *pci = ks_pcie->pci; struct device *dev = pci->dev; - u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0]; + u32 irq_offset = irq - ks_pcie->legacy_host_irq; struct irq_chip *chip = irq_desc_get_chip(desc); dev_dbg(dev, ": Handling legacy irq %d\n", irq);
@@ -657,6 +657,7 @@ static int ks_pcie_config_legacy_irq(struct keystone_pcie *ks_pcie) struct device_node *np = ks_pcie->np; struct device_node *intc_np; int irq_count, irq, ret, i; + struct irq_data *irq_data; intc_np = of_get_child_by_name(np, "legacy-interrupt-controller"); if (!intc_np) {
@@ -677,7 +678,15 @@ static int ks_pcie_config_legacy_irq(struct keystone_pcie *ks_pcie) ret = -EINVAL; goto err; } - ks_pcie->legacy_host_irqs[i] = irq; + + if (!ks_pcie->legacy_host_irq) { + irq_data = irq_get_irq_data(irq); + if (!irq_data) { + ret = -EINVAL; + goto err; + } + ks_pcie->legacy_host_irq = irq_data->hwirq; + } irq_set_chained_handler_and_data(irq, ks_pcie_legacy_irq_handler,
--
2.17.1
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