linux-kernel - [PATCH 4.4 131/137] Revert "x86/PCI: Dont alloc pcibios-irq when MSI is enabled"

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Message-Id: <20160418022515.806553034@linuxfoundation.org>
Date:	Mon, 18 Apr 2016 11:29:53 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 4.4 131/137] Revert "x86/PCI: Dont alloc pcibios-irq when MSI is enabled"

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit fe25d078874f2c29c38f4160467d74f5756537c9 upstream.

Revert 8affb487d4a4 ("x86/PCI: Don't alloc pcibios-irq when MSI is
enabled").

This is part of reverting 991de2e59090 ("PCI, x86: Implement
pcibios_alloc_irq() and pcibios_free_irq()") to fix regressions it
introduced.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=111211
Fixes: 991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()")
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Rafael J. Wysocki <rafael@...nel.org>
CC: Jiang Liu <jiang.liu@...ux.intel.com>
CC: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/pci/common.c |    8 --------
 1 file changed, 8 deletions(-)

--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -675,14 +675,6 @@ int pcibios_add_device(struct pci_dev *d

 int pcibios_alloc_irq(struct pci_dev *dev)
 {
-	/*
-	 * If the PCI device was already claimed by core code and has
-	 * MSI enabled, probing of the pcibios IRQ will overwrite
-	 * dev->irq.  So bail out if MSI is already enabled.
-	 */
-	if (pci_dev_msi_enabled(dev))
-		return -EBUSY;
-
 	return pcibios_enable_irq(dev);
 }