From a5ca6f06feb5eafb05ac825b900923f06a2a6c1f Mon Sep 17 00:00:00 2001 From: Xenia Ragiadakou Date: Sat, 31 Aug 2013 18:09:12 +0300 Subject: [PATCH] usbcore: set lpm_capable field for LPM capable root hubs commit 9df89d85b407690afa46ddfbccc80bec6869971d upstream. This patch sets the lpm_capable field for root hubs with LPM capabilities. Signed-off-by: Xenia Ragiadakou Reported-by: Martin MOKREJS Suggested-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hcd.c | 1 + drivers/usb/core/hub.c | 7 ++++++- drivers/usb/core/usb.h | 1 + 3 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index d53547d2e4c..d3aa353908a 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -1010,6 +1010,7 @@ static int register_root_hub(struct usb_hcd *hcd) dev_name(&usb_dev->dev), retval); return retval; } + usb_dev->lpm_capable = usb_device_supports_lpm(usb_dev); } retval = usb_new_device (usb_dev); diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 896532d3fc2..c8b9fa0e927 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -135,7 +135,7 @@ struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) return usb_get_intfdata(hdev->actconfig->interface[0]); } -static int usb_device_supports_lpm(struct usb_device *udev) +int usb_device_supports_lpm(struct usb_device *udev) { /* USB 2.1 (and greater) devices indicate LPM support through * their USB 2.0 Extended Capabilities BOS descriptor. @@ -156,6 +156,11 @@ static int usb_device_supports_lpm(struct usb_device *udev) "Power management will be impacted.\n"); return 0; } + + /* udev is root hub */ + if (!udev->parent) + return 1; + if (udev->parent->lpm_capable) return 1; diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h index 823857767a1..c49383669cd 100644 --- a/drivers/usb/core/usb.h +++ b/drivers/usb/core/usb.h @@ -35,6 +35,7 @@ extern int usb_get_device_descriptor(struct usb_device *dev, unsigned int size); extern int usb_get_bos_descriptor(struct usb_device *dev); extern void usb_release_bos_descriptor(struct usb_device *dev); +extern int usb_device_supports_lpm(struct usb_device *udev); extern char *usb_cache_string(struct usb_device *udev, int index); extern int usb_set_configuration(struct usb_device *dev, int configuration); extern int usb_choose_configuration(struct usb_device *udev); -- 2.20.1