linux-kernel - [PATCH 2/7] PCI: aardvark: Check for virq mapping when processing INTx IRQ

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Message-Id: <20210625090319.10220-3-pali@kernel.org>
Date:   Fri, 25 Jun 2021 11:03:14 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh@...nel.org>
Cc:     Marek Behún <kabel@...nel.org>,
        Marc Zyngier <maz@...nel.org>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] PCI: aardvark: Check for virq mapping when processing INTx IRQ

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@...nel.org>
Reviewed-by: Marek Behún <kabel@...nel.org>
Cc: stable@...r.kernel.org
---
 drivers/pci/controller/pci-aardvark.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 36fcc077ec72..59f91fad2481 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1226,7 +1226,11 @@ 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_ratelimited(&pcie->pdev->dev, "unexpected INT%c IRQ\n",
+					    (char)i+'A');
 	}
 }
 
-- 
2.20.1