[PATCH 5.15 119/135] PCI: aardvark: Check return value of generic_handle_domain_irq() when processing INTx IRQ

[Greg Kroah-Hartman]

From: Pali Roh�<pali@xxxxxxxxxx>

commit 51f96e287c6f003d3bb29672811c757c5fbf0028 upstream.

It is possible that we receive spurious INTx interrupt. Check for the
return value of generic_handle_domain_irq() when processing INTx IRQ.

Link: https://lore.kernel.org/r/20220110015018.26359-6-kabel@xxxxxxxxxx
Signed-off-by: Pali Roh�<pali@xxxxxxxxxx>
Signed-off-by: Marek Beh�abel@xxxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Signed-off-by: Marek Beh�abel@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/pci/controller/pci-aardvark.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1429,7 +1429,9 @@ static void advk_pcie_handle_int(struct
 		advk_writel(pcie, PCIE_ISR1_INTX_ASSERT(i),
 			    PCIE_ISR1_REG);
 
-		generic_handle_domain_irq(pcie->irq_domain, i);
+		if (generic_handle_domain_irq(pcie->irq_domain, i) == -EINVAL)
+			dev_err_ratelimited(&pcie->pdev->dev, "unexpected INT%c IRQ\n",
+					    (char)i + 'A');
 	}
 }