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The hub driver was recently changed to use "global" suspend for system suspend transitions on non-SuperSpeed buses. This means that we don't suspend devices individually by setting the suspend feature on the upstream hub port; instead devices all go into suspend automatically when the root hub stops transmitting packets. The idea was to save time and to avoid certain kinds of wakeup races. Now it turns out that many hubs are buggy; they don't relay wakeup requests from a downstream port to their upstream port if the downstream port's suspend feature is not set (depending on the speed of the downstream port, whether or not the hub is enabled for remote wakeup, and possibly other factors). We can't have hubs dropping wakeup requests. Therefore this patch goes partway back to the old policy: It sets the suspend feature for a port if the device attached to that port or any of its descendants is enabled for wakeup. People will still be able to benefit from the time savings if they don't care about wakeup and leave it disabled on all their devices. In order to accomplish this, the patch adds a new field to the usb_hub structure: wakeup_enabled_descendants is a count of how many devices below a suspended hub are enabled for remote wakeup. A corresponding new subroutine determines the number of wakeup-enabled devices at or below an arbitrary suspended USB device. This should be applied to the 3.10 stable kernel. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reported-and-tested-by: Toralf Förster <toralf.foerster@gmx.de> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/*
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* usb hub driver head file
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*
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* Copyright (C) 1999 Linus Torvalds
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* Copyright (C) 1999 Johannes Erdfelt
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* Copyright (C) 1999 Gregory P. Smith
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* Copyright (C) 2001 Brad Hards (bhards@bigpond.net.au)
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* Copyright (C) 2012 Intel Corp (tianyu.lan@intel.com)
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*
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* move struct usb_hub to this file.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <linux/usb.h>
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#include <linux/usb/ch11.h>
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#include <linux/usb/hcd.h>
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#include "usb.h"
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struct usb_hub {
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struct device *intfdev; /* the "interface" device */
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struct usb_device *hdev;
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struct kref kref;
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struct urb *urb; /* for interrupt polling pipe */
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/* buffer for urb ... with extra space in case of babble */
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u8 (*buffer)[8];
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union {
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struct usb_hub_status hub;
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struct usb_port_status port;
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} *status; /* buffer for status reports */
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struct mutex status_mutex; /* for the status buffer */
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int error; /* last reported error */
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int nerrors; /* track consecutive errors */
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struct list_head event_list; /* hubs w/data or errs ready */
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unsigned long event_bits[1]; /* status change bitmask */
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unsigned long change_bits[1]; /* ports with logical connect
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status change */
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unsigned long busy_bits[1]; /* ports being reset or
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resumed */
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unsigned long removed_bits[1]; /* ports with a "removed"
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device present */
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unsigned long wakeup_bits[1]; /* ports that have signaled
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remote wakeup */
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#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
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#error event_bits[] is too short!
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#endif
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struct usb_hub_descriptor *descriptor; /* class descriptor */
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struct usb_tt tt; /* Transaction Translator */
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unsigned mA_per_port; /* current for each child */
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#ifdef CONFIG_PM
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unsigned wakeup_enabled_descendants;
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#endif
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unsigned limited_power:1;
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unsigned quiescing:1;
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unsigned disconnected:1;
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unsigned quirk_check_port_auto_suspend:1;
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unsigned has_indicators:1;
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u8 indicator[USB_MAXCHILDREN];
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struct delayed_work leds;
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struct delayed_work init_work;
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struct usb_port **ports;
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};
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/**
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* struct usb port - kernel's representation of a usb port
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* @child: usb device attatched to the port
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* @dev: generic device interface
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* @port_owner: port's owner
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* @connect_type: port's connect type
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* @portnum: port index num based one
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* @power_is_on: port's power state
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* @did_runtime_put: port has done pm_runtime_put().
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*/
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struct usb_port {
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struct usb_device *child;
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struct device dev;
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struct dev_state *port_owner;
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enum usb_port_connect_type connect_type;
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u8 portnum;
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unsigned power_is_on:1;
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unsigned did_runtime_put:1;
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};
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#define to_usb_port(_dev) \
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container_of(_dev, struct usb_port, dev)
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extern int usb_hub_create_port_device(struct usb_hub *hub,
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int port1);
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extern void usb_hub_remove_port_device(struct usb_hub *hub,
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int port1);
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extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
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int port1, bool set);
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extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev);
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extern int hub_port_debounce(struct usb_hub *hub, int port1,
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bool must_be_connected);
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extern int usb_clear_port_feature(struct usb_device *hdev,
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int port1, int feature);
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static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
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int port1)
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{
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return hub_port_debounce(hub, port1, true);
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}
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static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
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int port1)
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{
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return hub_port_debounce(hub, port1, false);
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}
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