This is a note to let you know that I've just added the patch titled
usbcore: set lpm_capable field for LPM capable root hubs
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usbcore-set-lpm_capable-field-for-lpm-capable-root-hubs.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 9df89d85b407690afa46ddfbccc80bec6869971d Mon Sep 17 00:00:00 2001
From: Xenia Ragiadakou <[email protected]>
Date: Sat, 31 Aug 2013 18:09:12 +0300
Subject: usbcore: set lpm_capable field for LPM capable root hubs
From: Xenia Ragiadakou <[email protected]>
commit 9df89d85b407690afa46ddfbccc80bec6869971d upstream.
This patch sets the lpm_capable field for root hubs with LPM capabilities.
Signed-off-by: Xenia Ragiadakou <[email protected]>
Reported-by: Martin MOKREJS <[email protected]>
Suggested-by: Alan Stern <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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(-)
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1033,6 +1033,7 @@ static int register_root_hub(struct usb_
dev_name(&usb_dev->dev), retval);
return retval;
}
+ usb_dev->lpm_capable = usb_device_supports_lpm(usb_dev);
}
retval = usb_new_device (usb_dev);
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -135,7 +135,7 @@ struct usb_hub *usb_hub_to_struct_hub(st
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(struc
"Power management will be impacted.\n");
return 0;
}
+
+ /* udev is root hub */
+ if (!udev->parent)
+ return 1;
+
if (udev->parent->lpm_capable)
return 1;
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -35,6 +35,7 @@ extern int usb_get_device_descriptor(str
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);
Patches currently in stable-queue which might be from [email protected] are
queue-3.12/usbcore-set-lpm_capable-field-for-lpm-capable-root-hubs.patch
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