x86-32: Export kernel_stack_pointer() for modules

commit cb57a2b4cff7edf2a4e32c0163200e9434807e0a upstream.

Modules, in particular oprofile (and possibly other similar tools)
need kernel_stack_pointer(), so export it using EXPORT_SYMBOL_GPL().

Cc: Yang Wei <wei.yang@windriver.com>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Jun Zhang <jun.zhang@intel.com>
Link: http://lkml.kernel.org/r/20120912135059.GZ8285@erda.amd.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Robert Richter <rric@kernel.org>
Cc: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Cc: Philip Müller <philm@manjaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux 3.0.55

Conflicts:
	Makefile
Bluetooth: unlock if allocation fails in hci_blacklist_add()

There was a small typo here so we never actually hit the goto which
would call hci_dev_unlock_bh().

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 8475e2336cf80ba6e7b27715b4b3214d73c211ab)
Bluetooth: btusb: be quiet on device disconnect

Disabling the bluetooth usb device embedded in (some) ThinkPads tends to
lead to errors like these:
    btusb_bulk_complete: hci0 urb ffff88011b9bfd68 failed to resubmit (19)
    btusb_intr_complete: hci0 urb ffff88011b46a318 failed to resubmit (19)
    btusb_bulk_complete: hci0 urb ffff88011b46a000 failed to resubmit (19)

That is because usb_disconnect() doesn't "quiesces" pending urbs.

Disconnecting a device is a normal thing to happen so it's no big deal
that usb_submit_urb() returns -ENODEV. The simplest way to get rid of
these errors is to stop treating that return as an error. Trivial,
actually.

While we're at it, add comments to be explicit about the reasons we're
not complaining about -EPERM and -ENODEV.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 4935f1c164ac528dff3538f97953b385ba500710)
Bluetooth: cmtp: Fix lost wakeup of session thread

Fix race condition which can result in missing the wakeup intended
to stop the session thread.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 3a3f5c7df55a1294c9e6e2d0b8cea604b137438f)
Bluetooth: cmtp: Fix deadlock in session deletion

Commit fada4ac339 introduced the usage of kthread API.
kthread_stop is a blocking function which returns only when
the thread exits. In this case, the thread can't exit because it's
waiting for the write lock, which is being held by cmtp_del_connection()
which is waiting for the thread to exit -- deadlock.

Revert cmtp_reset_ctr to its original behavior: non-blocking signalling
for the session to terminate.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 7176522cdca1f0b78a1434b41761f0334511822a)
Bluetooth: cmtp: Fix session cleanup on failed conn add

Once the session thread is running, cleanup must be handled
by the session thread only.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 687beaa0d1d937c327e2f97b4b4fa6c23ca70624)
Bluetooth: make use of connection number to optimize the scheduler

This checks if there is any existing connection according to its type
before start iterating in the list and immediately stop iterating when
reaching the number of connections.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 52087a792c1513b85de674a4fc67fb92855474c3)
Bluetooth: Reset the security timer when a command is queued

Each time a SMP command is enqueued, we reset the SMP timer,
this way we follow exactly what the spec mandates:

"The Security Manager Timer shall be reset when an L2CAP SMP command is
queued for transmission." Vol. 3, Part H, Section 3.4

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit e2dcd113d15ef99d23498859e7006955b5367698)
Bluetooth: Add a flag to indicate that SMP is going on

Add HCI_CONN_LE_SMP_PEND flag to indicate that SMP is pending
for that connection. This allows to have information that an SMP
procedure is going on for that connection.

We use the HCI_CONN_ENCRYPT_PEND to indicate that encryption
(HCI_LE_Start_Encryption) is pending for that connection.

While a SMP procedure is going on we hold an reference to the
connection, to avoid disconnections.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit d26a23454813908a1bf0e2fd8c73233b22c6dbd7)
Bluetooth: Use the same timeouts for both ACL and LE links

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 454d48ff70c24930c6b0f9cb64f290fca2dfb271)
Bluetooth: Add support for running SMP without a socket

When doing the pairing procedure we won't have an associated
socket, but we still have to do the SMP negotiation. This
adds support for encrypting the link and exchanging keys.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 160dc6ac1256ed15a507bec9a2ff1f6d24a5a3ff)
Bluetooth: Add link_type information to the mgmt Connected event

One piece of information that was lost when using the mgmt interface,
was the type of the connection. Using HCI events we used to know
the type of the connection based on the type of the event, e.g.
HCI_LE_Connection_Complete for LE links.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit cfafccf730d363accacbd165542095ce6f7d2de8)
Bluetooth: Add mgmt command for fast connectable mode

Add command to management interface for enabling/disabling the
fast connectable mode.

Signed-off-by: Antti Julku <antti.julku@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit f6422ec624a19ba144b4b5cdbbc5ee41cc6f6400)
Bluetooth: Add LE link type for debugfs output

Add LE link type as known connection type for debugfs stringizing
output.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 21061df3a2577b8d1feb1ca3cb51445085692e89)
Bluetooth: hidp: Add support for NO_INIT_REPORTS quirk

During setup the host initializes all HID reports. Some devices do not
support this. If this quirk is set, we skip the initialization.
See also usbhid_init_reports() for this quirk.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 142c69c6eaab26587264881bb71546e30aafdcee)
Bluetooth: Move SMP fields to a separate structure

The objective is to make the core to have as little as possible
information about SMP procedures and logic. Now, all the SMP
specific information is hidden from the core.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 1c1def09c446aae441410b70e6439ffe44dee866)
Bluetooth: Move SMP crypto functions to a workqueue

The function crypto_blkcipher_setkey() called by smp_e()
can sleep, so all the crypto work has to be moved to
hci_dev workqueue.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit 8aab47574a7f5b46a4cdbc6fd820ab34e6c5dbf9)
Bluetooth: Require authentication if MITM protection is requested

The HIGH security level requires a 16 digit pin code for non-SSP
bondings. Sometimes this requirement is not acceptable and we still
want protection againts MITM attacks (which is something that the
MEDIUM security level doesn't provide), for that we should allow
another way to request authentication without using the HIGH security
level.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit e9bf2bf03e14627fac8520468231ea11dfa37610)
Bluetooth: Use the MEDIUM security level for pairings

This lifts the requirement of 16 digits pin codes when pairing
with devices that do not support SSP when using the mgmt interface.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
(cherry picked from commit c908df362c20be0eeef506fe62e13d835a4633f9)