Quantal update to v3.5.6 stable release

SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from Linus' tree or in a minimally
       backported form of that patch. The v3.5.6 upstream stable
       patch set is now available. It should be included in the Ubuntu
       kernel as well.

       git://git.kernel.org/

    TEST CASE: TBD

       The following patches are in the v3.5.6 stable release:

vfs: dcache: fix deadlock in tree traversal
dm mpath: only retry ioctl when no paths if queue_if_no_path set
dm: handle requests beyond end of device instead of using BUG_ON
dm table: clear add_random unless all devices have it set
dm verity: fix overflow check
usb: gadget: make g_printer enumerate again
usb: gadget: initialize the strings in tcm_usb_gadget properly
USB: option: blacklist QMI interface on ZTE MF683
USB: ftdi_sio: add TIAO USB Multi-Protocol Adapter (TUMPA) support
USB: qcaux: add Pantech vendor class match
usb: host: xhci: Fix Null pointer dereferencing with 71c731a for non-x86 systems
USB: serial: fix up bug with missing {}
staging: speakup_soft: Fix reading of init string
tty: keyboard.c: Remove locking from vt_get_leds.
staging: r8712u: Do not queue cloned skb
staging: comedi: s626: don't dereference insn->data
staging: comedi: jr3_pci: fix iomem dereference
staging: comedi: don't dereference user memory for INSN_INTTRIG
staging: comedi: fix memory leak for saved channel list
Remove BUG_ON from n_tty_read()
TTY: ttyprintk, don't touch behind tty->write_buf
serial: omap: fix software flow control
serial: pl011: handle corruption at high clock speeds
serial: set correct baud_base for EXSYS EX-41092 Dual 16950
tools/hv: Fix file handle leak
tools/hv: Fix exit() error code
tools/hv: Check for read/write errors
b43legacy: Fix crash on unload when firmware not available
firmware: Add missing attributes to EFI variable attribute print out from sysfs
xhci: Intel Panther Point BEI quirk.
xHCI: add cmd_ring_state
xHCI: add aborting command ring function
xHCI: cancel command after command timeout
xHCI: handle command after aborting the command ring
Increase XHCI suspend timeout to 16ms
HID: keep dev_rdesc unmodified and use it for comparisons
ath9k: Disable ASPM only for AR9285
xen/pciback: Restore the PCI config space after an FLR.
coredump: prevent double-free on an error path in core dumper
n_gsm.c: Implement 3GPP27.010 DLC start-up procedure in MUX
n_gsm: uplink SKBs accumulate on list
n_gsm: added interlocking for gsm_data_lock for certain code paths
n_gsm: memory leak in uplink error path
UBI: fix autoresize handling in R/O mode
UBI: erase free PEB with bitflip in EC header
Yama: handle 32-bit userspace prctl
SCSI: ibmvscsi: Fix host config length field overflow
SCSI: hpsa: Use LUN reset instead of target reset
can: mscan-mpc5xxx: fix return value check in mpc512x_can_get_clock()
remoteproc: select VIRTIO to avoid build breakage
remoteproc: fix a potential NULL-dereference on cleanup
IPoIB: Fix use-after-free of multicast object
IB/srp: Fix use-after-free in srp_reset_req()
IB/srp: Avoid having aborted requests hang
isci: fix isci_pci_probe() generates warning on efi failure path
x86/alternatives: Fix p6 nops on non-modular kernels
SCSI: scsi_remove_target: fix softlockup regression on hot remove
SCSI: scsi_dh_alua: Enable STPG for unavailable ports
Linux 3.5.6