linux-kernel - [PATCH] PCI/MSI: Don't set up INTx if MSI or MSI-X is enabled

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Date:   Tue, 13 Mar 2018 16:45:49 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     Mikael Starvik <starvik@...s.com>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        David Howells <dhowells@...hat.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-cris-kernel@...s.com, linux-kernel@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-am33-list@...hat.com
Subject: [PATCH] PCI/MSI: Don't set up INTx if MSI or MSI-X is enabled

From: Bjorn Helgaas <bhelgaas@...gle.com>

If a device already has MSI or MSI-X enabled, there's no need to set up its
legacy INTx interrupt.

bba6f6fc68e7 ("[PATCH] MSI-X: fix resume crash") changed the cris, frv,
x86, and ia64 arches to skip INTx setup when MSI is enabled.

16cf0ebc35dd ("x86/PCI: Do not use interrupt links for devices using
MSI-X") extended that by changing x86 to also skip INTx setup when MSI-X is
enabled.

Change the remaining arches (cris, frv, and ia64) to skip INTx setup when
either MSI or MSI-X is enabled.

Also update mn10300 (which didn't exist at the time of bba6f6fc68e7) to
follow the same pattern.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 arch/cris/arch-v32/drivers/pci/bios.c |    2 +-
 arch/frv/mb93090-mb00/pci-vdk.c       |    2 +-
 arch/ia64/pci/pci.c                   |    4 ++--
 arch/mn10300/unit-asb2305/pci.c       |    8 +++++---
 4 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/arch/cris/arch-v32/drivers/pci/bios.c b/arch/cris/arch-v32/drivers/pci/bios.c
index 6b9e6cfaa29e..c2bed0cc060b 100644
--- a/arch/cris/arch-v32/drivers/pci/bios.c
+++ b/arch/cris/arch-v32/drivers/pci/bios.c
@@ -68,7 +68,7 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
 	if ((err = pcibios_enable_resources(dev, mask)) < 0)
 		return err;
 
-	if (!dev->msi_enabled)
+	if (!pci_dev_msi_enabled(dev))
 		pcibios_enable_irq(dev);
 	return 0;
 }
diff --git a/arch/frv/mb93090-mb00/pci-vdk.c b/arch/frv/mb93090-mb00/pci-vdk.c
index f211839e2cae..4a55d1b82d21 100644
--- a/arch/frv/mb93090-mb00/pci-vdk.c
+++ b/arch/frv/mb93090-mb00/pci-vdk.c
@@ -413,7 +413,7 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
 
 	if ((err = pci_enable_resources(dev, mask)) < 0)
 		return err;
-	if (!dev->msi_enabled)
+	if (!pci_dev_msi_enabled(dev))
 		pcibios_enable_irq(dev);
 	return 0;
 }
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index f5ec736100ee..7ccc64d5fe3e 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -398,7 +398,7 @@ pcibios_enable_device (struct pci_dev *dev, int mask)
 	if (ret < 0)
 		return ret;
 
-	if (!dev->msi_enabled)
+	if (!pci_dev_msi_enabled(dev))
 		return acpi_pci_irq_enable(dev);
 	return 0;
 }
@@ -407,7 +407,7 @@ void
 pcibios_disable_device (struct pci_dev *dev)
 {
 	BUG_ON(atomic_read(&dev->enable_cnt));
-	if (!dev->msi_enabled)
+	if (!pci_dev_msi_enabled(dev))
 		acpi_pci_irq_disable(dev);
 }
 
diff --git a/arch/mn10300/unit-asb2305/pci.c b/arch/mn10300/unit-asb2305/pci.c
index 3dfe2d31c67b..4d36ea517679 100644
--- a/arch/mn10300/unit-asb2305/pci.c
+++ b/arch/mn10300/unit-asb2305/pci.c
@@ -399,10 +399,12 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
 	int err;
 
-	err = pci_enable_resources(dev, mask);
-	if (err == 0)
+	if ((err = pci_enable_resources(dev, mask)) < 0)
+		return err;
+
+	if (!pci_dev_msi_enabled(dev))
 		pcibios_enable_irq(dev);
-	return err;
+	return 0;
 }
 
 /*