linux-kernel - [PATCH] usb/core: skip unnecessary line IRQ request for USB3

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Message-ID: <1331786904.2979.64.camel@debian>
Date:	Thu, 15 Mar 2012 12:48:24 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	stern@...land.harvard.edu, gregkh <gregkh@...uxfoundation.org>
Cc:	sarah.a.sharp@...ux.intel.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>
Subject: [PATCH] usb/core: skip unnecessary line IRQ request for USB3


USB3 requests line IRQ here but will disable it
in later driver->start function and try MSI first.

xhci_hcd 0000:02:00.0: irq 18, io mem 0xfe500000
xhci_hcd 0000:02:00.0: irq 45 for MSI/MSI-X
xhci_hcd 0000:02:00.0: irq 46 for MSI/MSI-X

So it is better to remove the redundant request here. And
save a little time in booting.

Signed-off-by: Alex Shi <alex.shi@...el.com>
---
 drivers/usb/core/hcd.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index e128232..5b09825 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2450,7 +2450,8 @@ int usb_add_hcd(struct usb_hcd *hcd,
 	/* enable irqs just before we start the controller,
 	 * if the BIOS provides legacy PCI irqs.
 	 */
-	if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
+	if (usb_hcd_is_primary_hcd(hcd) && irqnum
+		&& (hcd->driver->flags & HCD_MASK) != HCD_USB3) {
 		retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
 		if (retval)
 			goto err_request_irq;
-- 
1.7.5.1



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