[PATCH RFC 10/11] iommu/arm-smmu-v3: Add IRQ mapping -EPROBE_DEFER handling
WARM2d
From: Lorenzo Pieralisi <lpieralisi@kernel.org>
Date: 2026-09-25 07:49:09
Also in:
driver-core, linux-acpi, linux-watchdog, lkml
Subsystem:
arm smmu drivers, iommu subsystem, the rest · Maintainers:
Will Deacon, Joerg Roedel, Linus Torvalds
With the advent of GICv5, IRQs mapping can fail if the interrupt controller the wired SMMU interrupts are routed to has not probed yet when the SMMU driver probes. Handle -EPROBE_DEFER gracefully for IRQ mappings failures. Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org> Cc: Will Deacon <will@kernel.org> Cc: Robin Murphy <robin.murphy@arm.com> --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 5732f3ba0122..1832389916a4 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c@@ -5562,18 +5562,26 @@ static int arm_smmu_device_probe(struct platform_device *pdev) /* Interrupt lines */ irq = platform_get_irq_byname_optional(pdev, "combined"); + if (irq == -EPROBE_DEFER) + return dev_err_probe(dev, irq, "failed to get combined IRQ\n"); if (irq > 0) smmu->combined_irq = irq; else { irq = platform_get_irq_byname_optional(pdev, "eventq"); + if (irq == -EPROBE_DEFER) + return dev_err_probe(dev, irq, "failed to get eventq IRQ\n"); if (irq > 0) smmu->evtq.q.irq = irq; irq = platform_get_irq_byname_optional(pdev, "priq"); + if (irq == -EPROBE_DEFER) + return dev_err_probe(dev, irq, "failed to get priq IRQ\n"); if (irq > 0) smmu->priq.q.irq = irq; irq = platform_get_irq_byname_optional(pdev, "gerror"); + if (irq == -EPROBE_DEFER) + return dev_err_probe(dev, irq, "failed to get gerror IRQ\n"); if (irq > 0) smmu->gerr_irq = irq; }
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2.54.0