Thanks to Andrew for doing the hard work on this.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

With CONFIG_PM=n:

drivers/built-in.o(.text+0x1098c): In function `hub_thread':
drivers/usb/core/hub.c:2673: undefined reference to `.dpm_runtime_resume'
drivers/built-in.o(.text+0x10998):drivers/usb/core/hub.c:2674: undefined reference to `.dpm_runtime_resume'

Please, never ever ever put extern decls into .c files.  Use the darn header
files :(

Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

With CONFIG_PM=n:

drivers/built-in.o(.text+0x2a69c): In function `ohci_hub_control':
drivers/usb/host/ohci-hub.c:539: undefined reference to `.usb_hcd_resume_root_hub'
drivers/built-in.o(.text+0x2b920): In function `ohci_irq':
drivers/usb/host/ohci-hcd.c:726: undefined reference to `.usb_hcd_resume_root_hub'

Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch (as592) makes a few small improvements to the way device
strings are handled, and it fixes some bugs in a couple of other sysfs
attribute routines.  (Look at show_configuration_string() to see what I
mean.)
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch (as591) fixes a rather innocuous bug that has been around for
quite a long time: Virtual root hubs should have a maxpacket length of
64 for endpoint 0.  I didn't realize it was wrong until I started
looking through the endpoint attribute files.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch (as590) fixes up all the remaining places where usbcore can
use kzalloc rather than kmalloc/memset.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

I can't stand text lines that wrap-around in my 80-column windows.  This
patch (as589) makes cosmetic changes to a couple of source files.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch (as588) fixes the way endpoint attribute files are registered
and unregistered.  Now they will correctly track along with altsetting
changes.  This fixes bugzilla entry #5467.

In a separate but related change, when a usb_reset_configuration call
fails, the device state is not changed to USB_STATE_ADDRESS.  In the
first place, failure means that we don't know what the state is, not
that we know the device is unconfigured.  In the second place, doing
this can potentially lead to a memory leak, since usbcore might not
realize there still is a current configuration that needs to be
destroyed.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This revised patch (as587b) improves the implementation of USB endpoint
sysfs files.  Instead of storing a whole bunch of attributes for every
single endpoint, each endpoint now gets its own kobject and they can
share a static list of attributes.  The number of extra fields added to
struct usb_host_endpoint has been reduced from 4 to 1.

The bEndpointAddress field is retained even though it is redundant (it
repeats the same information as the attributes' directory name).  The
code avoids calling kobject_register, to prevent generating unwanted
hotplug events.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This fixes a problem with some cdc acm devices that were not getting
automatically loaded as the module alias was not being reported
properly.

This check was for back in the days when we only reported hotplug events
for the main usb device, not the interfaces.  We should always give the
interface information for MODALIAS/modalias as it can be needed.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Dell supplied me with the following test:

#include<stdio.h>
#include<errno.h>
#include<sys/ioctl.h>
#include<fcntl.h>
#include<linux/usbdevice_fs.h>

main(int argc,char*argv[])
{
   struct usbdevfs_hub_portinfo hubPortInfo = {0};
   struct usbdevfs_ioctl command = {0};
   command.ifno = 0;
   command.ioctl_code = USBDEVFS_HUB_PORTINFO;
   command.data = (void*)&hubPortInfo;
   int fd, ret;
   if(argc != 2) {
     fprintf(stderr,"Usage: %s /proc/bus/usb/<BusNo>/<HubID>\n",argv[0]);
     fprintf(stderr,"Example: %s /proc/bus/usb/001/001\n",argv[0]);
     exit(1);
   }
   errno = 0;
   fd = open(argv[1],O_RDWR);
   if(fd < 0) {
     perror("open failed:");
     exit(errno);
   }
   errno = 0;
   ret = ioctl(fd,USBDEVFS_IOCTL,&command);
   printf("IOCTL return status:%d\n",ret);
   if(ret<0) {
     perror("IOCTL failed:");
     close(fd);
     exit(3);
   } else {
       printf("IOCTL passed:Num of ports %d\n",hubPortInfo.nports);
       close(fd);
       exit(0);
   }
   return 0;
}

I have verified that it breaks if built in 32 bit mode on x86_64 and that
the patch below fixes it.
Signed-off-by: NPete Zaitcev <zaitcev@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This also removes 2 usbmon callbacks.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This should let us get rid of all of the different hooks in the USB core for
when something has changed.

Also, some other parts of the kernel have wanted to know this kind of
information at times.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

It's only used locally.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch (as580) is perhaps the only result from the long discussion I
had with David about his changes to the root-hub suspend/resume code.  It
renames the hub_suspend and hub_resume methods in struct usb_hcd to
bus_suspend and bus_resume.  These are more descriptive names, since the
methods really do suspend or resume an entire USB bus, and less likely to
be confused with the hub_suspend and hub_resume routines in hub.c.

It also takes David's advice about removing the layer of bus glue, where
those methods are called.  And it implements a related change that David
made to the other HCDs but forgot to put into dummy_hcd.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Also has the nice benefit of making sparc alignment issues go away.

Thanks to David Miller for pointing out the problems here.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/hub.c |   22 ++++++++++++----------
 drivers/usb/core/hub.h |    2 +-
 2 files changed, 13 insertions(+), 11 deletions(-)

Because there is no bulk_interrupt_message() routine and no
USBDEVFS_INTERRUPT ioctl, people have been forced to abuse the
usb_bulk_message() routine and USBDEVFS_BULK by using them for interrupt
transfers as well as bulk transfers.

This patch (as567) formalizes this practice and adds code to
usb_bulk_message() for detecting when the target is really an interrupt
endpoint.  If it is, the routine submits an interrupt URB (using the
default interval) instead of a bulk URB.  In theory this should help HCDs
that don't like it when people try to mix transfer types, queuing both
periodic and non-periodic types for the same endpoint.

Not fully tested -- I don't have any programs that use USBDEVFS_BULK for
interrupt transfers -- but it compiles okay and normal bulk messages work
as well as before.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/message.c |   24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

Reject URBs to _all_ devices when their host controllers are suspended;
even root hub registers will be unavailable.  Also, don't reject urbs
to root hubs in other cases; the only upstream link is through that
controller (on PCI or whatever SOC bus is in use).
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/hcd.c |   28 ++++++++++++----------------
 drivers/usb/core/urb.c |    3 ++-
 2 files changed, 14 insertions(+), 17 deletions(-)

The way we're looking at USB suspend lately doesn't expect drivers to
call usb_suspend_device() or usb_resume_device() directly; that'll
be implicit when no interfaces are in use.

This patch removes those APIs from visibility outside usbcore.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>

 drivers/usb/core/hub.c |   12 ++++--------
 drivers/usb/core/usb.h |    4 ++++
 include/linux/usb.h    |    5 -----
 3 files changed, 8 insertions(+), 13 deletions(-)

This updates the PCI glue to address the new and simplified usbcore suspend
semantics, where CONFIG_USB_SUSPEND becomes irrelevant to HCDs because
hcd->hub_suspend() will always be called.

  - Removes now-unneeded recursion support

  - Go back to ignoring faults reported by the wakeup calls; we expect them
    to fail sometimes, and that's just fine.

The PCI HCDs will need simple changes to catch up to this, like being able
to ignore the setting of CONFIG_USB_SUSPEND.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/hcd-pci.c |  106 +++++++++++++++++++++------------------------
 drivers/usb/core/hcd.h     |    6 +-
 2 files changed, 53 insertions(+), 59 deletions(-)

This patch associates hub suspend and resume logic (including for root hubs)
with CONFIG_PM -- instead of CONFIG_USB_SUSPEND as before -- thereby unifying
two troublesome versions of suspend logic into just one.  It'll be easier to
keep things right from now on.

  - Now usbcore _always_ calls hcd->hub_suspend as needed, instead of
    only when USB_SUSPEND is enabled:
     * Those root hub methods are now called from hub suspend/resume;
       no more skipping between layers during device suspend/resume;
     * It now handles cases allowed by sysfs or autosuspended root hubs,
       by forcing the hub interface to resume too.

  - All devices, including virtual root hubs, now get the same treatment
    on their resume paths ... including re-activating all their interfaces.

Plus it gets rid of those stub copies of usb_{suspend,resume}_device(), and
updates the Kconfig to match the new definition of USB_SUSPEND:  it provides
(a) selective suspend, downstream from hubs; and (b) remote wakeup, upstream
from any device configuration which supports it.

This calls for minor followup patches for most HCDs (and their PCI glue).
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/Kconfig |   11 ++-
 drivers/usb/core/hub.c   |  163 +++++++++++++++++++++++++----------------------
 2 files changed, 97 insertions(+), 77 deletions(-)

This patch collects various small updates related to root hubs, to shrink
later patches which build on them.

  - For root hub suspend/resume support:
     * Make the existing usb_hcd_resume_root_hub() routine respect pmcore
       locking, exporting and using the dpm_runtime_resume() method.
     * Add a new usb_hcd_suspend_root_hub() to pair with that routine.
       (Essential to make OHCI autosuspend behave again...)
     * HC_SUSPENDED by itself only refers to the root hub's downstream ports.
       So let HCDs see root hub URBs unless the parent device is suspended.

  - Remove an assertion we no longer need (and now, also don't want).

  - Generic suspend/resume updates to work better with swsusp.
     * Ignore the FREEZE vs SUSPEND distinction for hardware; trying to
       use it breaks the swsusp snapshots it's supposed to help (sigh).
     * On resume, mark devices as resumed right away, but then
       do nothing else if the device is marked NOTATTACHED.

These changes shouldn't be very noticable by themselves.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/base/power/runtime.c |    1
 drivers/usb/core/hcd.c       |   64 ++++++++++++++++++++++++++++++++++++++-----
 drivers/usb/core/hcd.h       |    1
 drivers/usb/core/hub.c       |   45 ++++++++++++++++++++++++------
 drivers/usb/core/usb.c       |   20 +++++++++----
 drivers/usb/core/usb.h       |    1
 6 files changed, 111 insertions(+), 21 deletions(-)

This cleans up a small recent FIXME, ensuring that all the HCDs provide
root hub suspend/resume methods.  It also wraps the calls to those root
suspend routines just like on the PCI "USB_SUSPEND not defined" cases,
so non-PCI bus glue won't be as tempted to behave very differently.

Several of the SOC based OHCI drivers forgot to list those methods;
the patch also adds those missing declarations.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/hcd.c          |   42 +++++++++++++++++++++++++---------------
 drivers/usb/host/ohci-au1xxx.c  |    5 ++++
 drivers/usb/host/ohci-lh7a404.c |    5 ++++
 drivers/usb/host/ohci-pxa27x.c  |    1
 drivers/usb/host/ohci-s3c2410.c |    1
 drivers/usb/host/ohci-sa1111.c  |    1
 6 files changed, 40 insertions(+), 15 deletions(-)

Signed-off-by: NMatt Porter <mporter@kernel.crashing.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/hub.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

This simplifies some of the PM-related #ifdeffing by recognizing
that USB_SUSPEND depends on PM.  Also, OHCI drivers were often
testing for USB_SUSPEND when they should have tested just PM.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/hcd.c          |    2 ++
 drivers/usb/host/ohci-hcd.c     |    2 +-
 drivers/usb/host/ohci-hub.c     |    4 ++--
 drivers/usb/host/ohci-omap.c    |    2 +-
 drivers/usb/host/ohci-pci.c     |    2 +-
 drivers/usb/host/ohci-ppc-soc.c |    4 ++--
 drivers/usb/host/ohci-pxa27x.c  |    2 +-
 drivers/usb/host/ohci-s3c2410.c |    3 +--
 drivers/usb/host/ohci-sa1111.c  |    2 +-
 9 files changed, 12 insertions(+), 11 deletions(-)

This gets rid of some inconsistently duplicated logic to resume interfaces.
Similar code was in both finish_port_resume() and in usb_generic_resume().
Now there is just one copy of that code, accessed regardless of whether
CONFIG_USB_SUSPEND is enabled.  Fault handling is also more consistent.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch removes the extra usb_suspend_device() parameter.  The original
reason to pass that parameter was so that this routine could suspend any
active children.  A previous patch removed that functionality ... leaving
no reason to pass the parameter.  A close analogy is pci_set_power_state,
which doesn't need a pm_message_t either.

On the internal code path that comes through the driver model, the parameter
is now used to distinguish cases where USB devices need to "freeze" but not
suspend.   It also checks for an error case that's accessible through sysfs:
attempting to suspend a device before its interfaces (or for hubs, ports).
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/hub.c         |   34 +++++++++++++++++++++-------------
 drivers/usb/core/usb.c         |   23 +++++++++++++++++++++--
 drivers/usb/host/ehci-hcd.c    |    2 +-
 drivers/usb/host/isp116x-hcd.c |    2 +-
 drivers/usb/host/ohci-pci.c    |    2 +-
 include/linux/usb.h            |    2 +-
 6 files changed, 46 insertions(+), 19 deletions(-)

This patch removes some recursion in the CONFIG_USB_SUSPEND logic, which
suspended children (of devices or hubs) that weren't already suspended.
When it sees such cases, suspend now just fails cleanly.

That logic was not needed during system-wide sleep state transitions; and
given the current notions of how to manage selective suspend transitions,
we don't want it there either.  Where it was particularly handy was coping
with various limitations of the sysfs "echo -n N > power/state" support.
(These include assuming that "N" is always meaningful to the driver; and
that drivers can only transition to state N from state zero.)
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This updates the handling of power state for USB interfaces.

  - Formalizes an existing invariant:  interface "power state" is a boolean:
    ON when I/O is allowed, and FREEZE otherwise.  It does so by defining
    some inlined helpers, then using them.

  - Adds a useful invariant:  the only interfaces marked active are those
    bound to non-suspended drivers.  Later patches build on this invariant.

  - Simplifies the interface driver API (and removes some error paths) by
    removing the requirement that they record power state changes during
    suspend and resume callbacks.  Now usbcore does that.

A few drivers were simplified to address that last change.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/hub.c       |   33 +++++++++------------
 drivers/usb/core/message.c   |    1
 drivers/usb/core/usb.c       |   65 +++++++++++++++++++++++++++++++++----------
 drivers/usb/core/usb.h       |   18 +++++++++++
 drivers/usb/input/hid-core.c |    2 -
 drivers/usb/misc/usbtest.c   |   10 ------
 drivers/usb/net/pegasus.c    |    2 -
 drivers/usb/net/usbnet.c     |    2 -
 8 files changed, 85 insertions(+), 48 deletions(-)

Now we can log the urbs travelling through usbfs
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Also fixes all drivers that set this field, and removes some other devfs
specfic USB logic.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/class/usblp.c           |    3 +--
 drivers/usb/core/file.c             |   19 ++++---------------
 drivers/usb/image/mdc800.c          |    3 +--
 drivers/usb/input/aiptek.c          |    2 +-
 drivers/usb/input/hiddev.c          |    3 +--
 drivers/usb/media/dabusb.c          |    3 +--
 drivers/usb/misc/auerswald.c        |    3 +--
 drivers/usb/misc/idmouse.c          |    5 ++---
 drivers/usb/misc/legousbtower.c     |    5 ++---
 drivers/usb/misc/rio500.c           |    3 +--
 drivers/usb/misc/sisusbvga/sisusb.c |    5 -----
 drivers/usb/misc/usblcd.c           |    9 ++++-----
 drivers/usb/usb-skeleton.c          |    3 +--
 include/linux/usb.h                 |    7 ++-----
 14 files changed, 22 insertions(+), 51 deletions(-)

This patch adds endpoint information for both devices and interfaces to
sysfs.  Previously it was only possible to get the endpoint information
from usbfs, and never possible to get any information on endpoint 0.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/sysfs.c |  195 ++++++++++++++++++++++++++++++++++++++++++++++-
 include/linux/usb.h      |    4
 2 files changed, 197 insertions(+), 2 deletions(-)

The previous patch adding the ability to nest struct class_device
changed the paramaters to the call class_device_create().  This patch
fixes up all in-kernel users of the function.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch teaches "usb_device" about the new driver model wakeup support:

 - It updates device wakeup capabilities when entering a configuration
   with the WAKEUP attribute;

 - During suspend processing it consults the policy bit to see
   whether it should enable wakeup for that device.  (This resolves
   a FIXME to not assume the answer is always "yes"; some devices
   lie about supporting remote wakeup.)

Support for root hubs and the HCDs is separate (and more complex).
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

All the same issues - we can't just save the pointer to the thread, we
must save the pid/uid/euid combination.
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

If a process issues an URB from userspace and (starts to) terminate
before the URB comes back, we run into the issue described above.  This
is because the urb saves a pointer to "current" when it is posted to the
device, but there's no guarantee that this pointer is still valid
afterwards.

In fact, there are three separate issues:

1) the pointer to "current" can become invalid, since the task could be
   completely gone when the URB completion comes back from the device.

2) Even if the saved task pointer is still pointing to a valid task_struct,
   task_struct->sighand could have gone meanwhile.

3) Even if the process is perfectly fine, permissions may have changed,
   and we can no longer send it a signal.

So what we do instead, is to save the PID and uid's of the process, and
introduce a new kill_proc_info_as_uid() function.
Signed-off-by: NHarald Welte <laforge@gnumonks.org>
[ Fixed up types and added symbol exports ]
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

the free_irq() in USB suspend breaks resume on some setups where USB
(ohci/ehci) shares the interrupt with an other device.
Signed-off-by: NDaniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>