If the waker is killed before it can replay outstanding URBs, these URBs
won't be freed or will be replayed at the next open.  This patch closes
the window by explicitely discarding outstanding URBs.
Signed-off-by: NOliver Neukum <oliver@neukum.org>
Acked-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Rafael debugged a resume-time hang (with oopses in workqueue handling)
on his laptop that was due to the 'waker' workqueue entry being
disconnected and then released without the workqueue entry having been
synchronized.

Several people were involved, with Oleg Nesterov doing a debugging patch
showing what workqueue entry was corrupt etc.

This was a regression introduced by commit 7bee549e ("Bluetooth: Add
USB autosuspend support to btusb driver") as Rafael points out (not
actually bisected, but it became clear once the bug was found).
Tested-and-reported-by: NRafael J. Wysocki <rjw@sisk.pl>
Acked-by: NOliver Neukum <oliver@neukum.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This patch adds support of USB autosuspend to the btusb driver.

If the device doesn't support remote wakeup, simple support based on
up/down is provided. If the device supports remote wakeup, additional
support for autosuspend while the interface is up is provided. This is
done by queueing URBs in an anchor structure and waking the device up
from a work queue on sending. Reception triggers remote wakeup.

The last busy facility of the USB autosuspend code is used. To close
a race between autosuspend and transmission, a counter of ongoing
transmissions is maintained.

Add #ifdefs for CONFIG_PM as necessary.
Signed-off-by: NOliver Neukum <oliver@neukum.org>
Tested-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch increases the receive buffer size to HCI_MAX_FRAME_SIZE
which improves the RX throughput considerably.

Tested against BRM/Atheros/CSR USB Dongles with PAN profile using
iperf and chariot. This gave significant (around 40%) increase
in performance (increased from 0.8 to 1.5 Mb/s in Sheld room)
Signed-off-by: NVikram Kandukuri <vikram.kandukuri@atheros.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

Submitting the bulk URBs for ACL data transfers only on demand has no
real benefit compared to just submit them when a Bluetooth device gets
opened. So when submitting the interrupt URBs for HCI events, just
submit the bulk URBs, too.

This solves a problem with some Bluetooth USB dongles that has been
reported over the last few month. These devices require that the bulk
URBs are actually present. These devices are really broken, but there
is nothing we can do about it.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

With the introduction of CONFIG_DYNAMIC_PRINTK_DEBUG it is possible to
allow debugging without having to recompile the kernel. This patch turns
all BT_DBG() calls into pr_debug() to support dynamic debug messages.

As a side effect all CONFIG_BT_*_DEBUG statements are now removed and
some broken debug entries have been fixed.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch allows the Asus WL-BTD202 dongle to be used with a mono
headset without having to specify "options btusb force_scofix=1".

Based on a patch from Guillaume Bedot <littletux@zarb.org>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

The Bluetooth subsystem was not using the HCI Reset command when doing
device initialization. The Bluetooth 1.0b specification was ambiguous
on how the device firmware was suppose to handle it. Almost every device
was triggering a transport reset at the same time. In case of USB this
ended up in disconnects from the bus.

All modern Bluetooth dongles handle this perfectly fine and a lot of
them actually require that HCI Reset is sent. If not then they are
either stuck in their HID Proxy mode or their internal structures for
inquiry and paging are not correctly setup.

To handle old and new devices smoothly the Bluetooth subsystem contains
a quirk to force the HCI Reset on initialization. However maintaining
such a quirk becomes more and more complicated. This patch turns the
logic around and lets the old devices disable the HCI Reset command.

The only device where the HCI_QUIRK_NO_RESET is still needed are the
original Digianswer devices and dongles with an early CSR firmware.

CSR reported that they fixed this for version 12 firmware. The last
official release of version 11 firmware is build ID 115. The first
version 12 candidate was build ID 117.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

During suspend it is important that all URBs are cancelled and then on
resume re-submitted. This gives initial suspend/resume support.

Based on initial work from Oliver Neukum <oneukum@suse.de>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

With the addition of usb_unlink_anchored_urbs() it is possible to fully
control the bulk URBs from the notify callback. There is no need to
schedule work and so only do this for the ISOC URBs.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

The URB submission routines need more fine grained control for the
mem_flags used by kmalloc(), usb_alloc_urb() and usb_submit_urb() to
better support different caller situations. Add a mem_flags parameter
and give the caller full control.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

The new A-Link Bluetooth dongle is another one based on the BCM2046 chip
from Broadcom and it also needs to send HCI_Reset before it becomes fully
operational. Without the quirk it will show a lot of I/O errors.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

Targus and Belkin have come out with new Bluetooth 2.1 capable dongles
using the latest BCM2046 chip from Broadcom. Both of them are so called
HID proxy dongles and they need to send HCI_Reset before they become
fully operational.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

The transfer buffer of an URB will be automatically freed when using
the URB_FREE_BUFFER transfer_flag. So the extra calls to kfree() will
cause a double free.
Reported-by: NJustin Mattock <justinmattock@gmail.com>
Signed-off-by: NRabin Vincent <rabin@rab.in>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

The USB transport specification for Bluetooth splits the ACL and SCO
handling into two separate interfaces. In Linux it possible to probe
and disconnect these interfaces independently. So make sure that both
interfaces are tightly bound together.

This fixes the suspend regression that some people have expierenced.
Signed-off-by: NOliver Neukum <oneukum@suse.de>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

The btusb driver contains two typos that result in some buggy behavior,
but the impact is not immediately visible.

During initialization the submitting of interrupt URBs might fail and
then make sure to remove the correct flag and not one of the hci_dev
flags.

When closing down the interface make sure to kill the anchor for the
ISOC URBs and not kill the interrupt URBs twice.

Also cancel any scheduled work when closing down the interface.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

The newer MacBooks contain a Broadcom based Bluetooth chip and to make
this work properly, HCI_Reset must be send first. If HCI_Reset is not
used then a lot of I/O errors show up and its triggers packets from
non-existent ACL links.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

The new generic driver for Bluetooth USB devices was missing proper
SCO support. The driver now claims the second interface for these USB
devices to allow the flow of SCO packets. It also handles switching
of the alternate setting and re-submission of isochronous URBs.

The btusb driver is now a full replacement for hci_usb and thus the
experimental tag has been removed and this driver is promoted as
preferred one.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This implements all the quirk handling from the hci_usb driver to the
new btusb driver.
Signed-off-by: NOliver Neukum <oneukum@suse.de>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

This patch adds a new generic driver for Bluetooth USB devices. This
driver is still experimental at this point, but it is cleaner and
easier to maintain than the current Bluetooth USB driver. It is a
much better starting point for power management improvements.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>