From 1ff4df56846d10379939166713bb2908e6a5ee0e Mon Sep 17 00:00:00 2001
From: Andiry Xu <andiry.xu@amd.com>
Date: Fri, 23 Sep 2011 14:19:48 -0700
Subject: usbcore: check device's LPM capability

Check device's LPM capability by examining the bmAttibutes field of the
USB2.0 Extension Descriptor.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/usb/core/hub.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'drivers/usb/core')

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 7a2514322bf..4ffc3d1bd9e 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3083,8 +3083,14 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 		goto fail;
 	}
 
-	if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201)
-		usb_get_bos_descriptor(udev);
+	if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
+		retval = usb_get_bos_descriptor(udev);
+		if (!retval) {
+			if (udev->bos->ext_cap && (USB_LPM_SUPPORT &
+				le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
+					udev->lpm_capable = 1;
+		}
+	}
 
 	retval = 0;
 	/* notify HCD that we have a device connected and addressed */
-- 
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