On a system with a logitech wireless keyboard/mouse and DMA-API debugging
enabled, this warning appears at boot:

kernel: WARNING: at lib/dma-debug.c:929 check_for_stack.part.12+0x70/0xa7()
kernel: Hardware name: MS-7593
kernel: uhci_hcd 0000:00:1d.1: DMA-API: device driver maps memory fromstack [addr=ffff8801b0079c29]

Make logi_dj_recv_query_paired_devices and logi_dj_recv_switch_to_dj_mode
use a structure allocated with kzalloc rather than a stack based one.
Signed-off-by: NMarc Dionne <marc.c.dionne@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

On big-endian systems (e.g., Apple PowerBook), trying to use a
logitech wireless mouse with the Logitech Unifying Receiver does not
work with v3.2 and later kernels.  The device doesn't show up in
/dev/input.  Older kernels work fine.

That is because the new hid-logitech-dj driver claims the device.  The
device arrival notification appears:

	20 00 41 02 00 00 00 00 00 00 00 00 00 00 00

and we read the report_types bitfield (02 00 00 00) to find out what
kind of device it is.  Unfortunately the driver only reads the first 8
bits and treats that value as a 32-bit little-endian number, so on a
powerpc the report type seems to be 0x02000000 and is not recognized.

Even on little-endian machines, connecting a media center remote
control (report type 00 01 00 00) with this driver loaded would
presumably fail for the same reason.

Fix both problems by using get_unaligned_le32() to read all four
bytes, which is a little clearer anyway.  After this change, the
wireless mouse works on Hugo's PowerBook again.

Based on a patch by Nestor Lopez Casado.
Addresses http://bugs.debian.org/671292Reported-by: NHugo Osvaldo Barrera <hugo@osvaldobarrera.com.ar>
Inspired-by: NNestor Lopez Casado <nlopezcasad@logitech.com>
Signed-off-by: NJonathan Nieder <jrnieder@gmail.com>
Signed-off-by: NNestor Lopez Casado <nlopezcasad@logitech.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

The current code allows several consecutive calls to hid_parse_report(),
which may have happened to work before, but would cause a memory leak
and generally be incorrect. This patch collects all the reports
before sending them once.

Cc: Nestor Lopez Casado <nlopezcasad@logitech.com>
Tested-by: Benjamin Tissoires <benjamin.tissoires@gmail.com
Signed-off-by: NHenrik Rydberg <rydberg@euromail.se>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

The user can only experience the bug if she pairs 6 devices to a Unifying
receiver. The sixth paired device would not work.

The value changed is actually a bitmask that enables reporting from each
paired device. As the sixth bit was not set, the sixth device reports are
ignored by the receiver and never get to the driver.
Signed-off-by: NNestor Lopez Casado <nlopezcasad@logitech.com>

 drivers/hid/hid-logitech-dj.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

There is a bug where a device with index 6 would write out of bounds in
the array of paired devices.
This patch fixes that problem.
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NBenjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: NOlivier Gay <ogay@logitech.com>
Signed-off-by: NNestor Lopez Casado <nlopezcasad@logitech.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

With this driver, all the devices paired to a single Unifying
receiver are exposed to user processes in separated /input/dev
nodes.

Keyboards with different layouts can be treated differently,
Multiplayer games on single PC (like home theater PC) can
differentiate input coming from different kbds paired to the
same receiver.

Up to now, when Logitech Unifying receivers are connected to a
Linux based system, a single keyboard and a single mouse are
presented to the HID Layer, even if the Unifying receiver can
pair up to six compatible devices. The Unifying receiver by default
multiplexes all incoming events (from multiple keyboards/mice)
into these two.
Signed-off-by: NNestor Lopez Casado <nlopezcasad@logitech.com>
Signed-off-by: NBenjamin Tissoires <benjamin.tissoires@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>