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

From: Pali Rohár <[email-masked]>
Date: Thu, 6 May 2021 17:31:23 +0200

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

Signed-off-by: Pali Rohár <[email-masked]>
Reviewed-by: Marek Behún <[email-masked]>
Cc: [email-masked]
---
 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

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