linux-kernel - [PATCH v2 2/2] x86, pci: Enable PCI INTx when MSI is disabled

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Message-Id: <20121002074451.204.86668.sendpatchset@indoh>
Date:	Tue,  2 Oct 2012 16:50:37 +0900 (JST)
From:	Takao Indoh <indou.takao@...fujitsu.com>
To:	linux-pci@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Cc:	martin.wilck@...fujitsu.com, kexec@...ts.infradead.org,
	hbabu@...ibm.com, mingo@...hat.com, vgoyal@...hat.com,
	ishii.hironobu@...fujitsu.com, hpa@...or.com, bhelgaas@...gle.com,
	tglx@...utronix.de, Takao Indoh <indou.takao@...fujitsu.com>
Subject: [PATCH v2 2/2] x86, pci: Enable PCI INTx when MSI is disabled

This patch enables INTx if MSI is disabled in pcibios_enable_device().
In normal case interrupt disable bit in command register is 0b on boot
time, but in case of kdump, this bit may be 1b. It causes problems of
some drivers. At leaset I confirmed mptsas driver does not work in such
a case. This patch fix this problem.

Signed-off-by: Takao Indoh <indou.takao@...fujitsu.com>
---
 arch/x86/pci/common.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 720e973..2bb7ecc 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -615,8 +615,10 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
 	if ((err = pci_enable_resources(dev, mask)) < 0)
 		return err;
 
-	if (!pci_dev_msi_enabled(dev))
+	if (!pci_dev_msi_enabled(dev)) {
+		pci_intx(dev, true);
 		return pcibios_enable_irq(dev);
+	}
 	return 0;
 }
 

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