linux-kernel - [PATCH][v2] xhci: correctly enable interrupts

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Message-Id: <1362385324-15228-1-git-send-email-hare@suse.de>
Date:	Mon,  4 Mar 2013 09:22:04 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...e.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Oliver Neukum <oneukum@...e.de>,
	Thomas Renninger <trenn@...e.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Frederik Himpe <fhimpe@....ac.be>,
	David Haerdeman <david@...deman.nu>,
	Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH][v2] xhci: correctly enable interrupts

xhci has its own interrupt enabling routine, which will try to
use MSI-X/MSI if present. So the usb core shouldn't try to enable
legacy interrupts; on some machines the xhci legacy IRQ setting
is invalid.

Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Oliver Neukum <oneukum@...e.de>
Cc: Thomas Renninger <trenn@...e.de>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Frederik Himpe <fhimpe@....ac.be>
Cc: David Haerdeman <david@...deman.nu>
Cc: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Hannes Reinecke <hare@...e.de>

diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index 622b4a4..2647e75 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -173,6 +173,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	struct hc_driver	*driver;
 	struct usb_hcd		*hcd;
 	int			retval;
+	int			hcd_irq = 0;
 
 	if (usb_disabled())
 		return -ENODEV;
@@ -187,15 +188,21 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 		return -ENODEV;
 	dev->current_state = PCI_D0;
 
-	/* The xHCI driver supports MSI and MSI-X,
-	 * so don't fail if the BIOS doesn't provide a legacy IRQ.
+	/*
+	 * The xHCI driver supports MSI and MSI-X,
+	 * so don't fail if the BIOS doesn't provide a legacy IRQ
+	 * and do not try to enable legacy IRQs.
 	 */
-	if (!dev->irq && (driver->flags & HCD_MASK) != HCD_USB3) {
-		dev_err(&dev->dev,
-			"Found HC with no IRQ.  Check BIOS/PCI %s setup!\n",
-			pci_name(dev));
-		retval = -ENODEV;
-		goto disable_pci;
+	if ((driver->flags & HCD_MASK) != HCD_USB3) {
+		if (!dev->irq) {
+			dev_err(&dev->dev,
+				"Found HC with no IRQ.  "
+				"Check BIOS/PCI %s setup!\n",
+				pci_name(dev));
+			retval = -ENODEV;
+			goto disable_pci;
+		}
+		hcd_irq = dev->irq;
 	}
 
 	hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
@@ -245,7 +252,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 
 	pci_set_master(dev);
 
-	retval = usb_add_hcd(hcd, dev->irq, IRQF_SHARED);
+	retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
 	if (retval != 0)
 		goto unmap_registers;
 	set_hs_companion(dev, hcd);
--
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