target/linux/generic/pending-5.10/850-0005-PCI-aardvark-Check-return-value-of-generic_handle_do.patch

   1 From 69c1f2c6f45a556361fd8e8d2d4eb20e2c8d3d95 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
   3 Date: Thu, 18 Mar 2021 17:04:32 +0100
   4 Subject: [PATCH] PCI: aardvark: Check return value of
   5  generic_handle_domain_irq() when processing INTx IRQ
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 It is possible that we receive spurious INTx interrupt. Check for the
  11 return value of generic_handle_domain_irq() when processing INTx IRQ.
  12
  13 Signed-off-by: Pali Rohár <pali@kernel.org>
  14 Signed-off-by: Marek Behún <kabel@kernel.org>
  15 ---
  16  drivers/pci/controller/pci-aardvark.c | 4 +++-
  17  1 file changed, 3 insertions(+), 1 deletion(-)
  18
  19 diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
  20 index 01dfe70d9c2c..4be05b52d835 100644
  21 --- a/drivers/pci/controller/pci-aardvark.c
  22 +++ b/drivers/pci/controller/pci-aardvark.c
  23 @@ -1437,7 +1437,9 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
  24                             PCIE_ISR1_REG);
  25
  26                 virq = irq_find_mapping(pcie->irq_domain, i);
  27 -               generic_handle_irq(virq);
  28 +               if (generic_handle_irq(virq) == -EINVAL)
  29 +                       dev_err_ratelimited(&pcie->pdev->dev, "unexpected INT%c IRQ\n",
  30 +                                           (char)i + 'A');
  31         }
  32  }
  33
  34 --
  35 2.34.1
  36