[PATCH 12/42] PCI: aardvark: Check for virq mapping when processing INTx IRQ

From: Pali Rohár
Date: Thu May 06 2021 - 11:34:38 EST


It is possible that we receive spurious INTx interrupt. So add needed check
before calling generic_handle_irq() function.

Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Reviewed-by: Marek Behún <kabel@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/pci/controller/pci-aardvark.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 362faddae935..e7089db11f79 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1106,7 +1106,10 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
PCIE_ISR1_REG);

virq = irq_find_mapping(pcie->irq_domain, i);
- generic_handle_irq(virq);
+ if (virq)
+ generic_handle_irq(virq);
+ else
+ dev_err(&pcie->pdev->dev, "unexpected INT%c IRQ\n", (char)i+'A');
}
}

--
2.20.1