PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies

In a struct pcie_link_state, link->root points to the pcie_link_state of
the root of the PCIe hierarchy.  For the topmost link, this points to
itself (link->root = link).  For others, we copy the pointer from the
parent (link->root = link->parent->root).

Previously we recognized that Root Ports originated PCIe hierarchies, but
we treated PCI/PCI-X to PCIe Bridges as being in the middle of the
hierarchy, and when we tried to copy the pointer from link->parent->root,
there was no parent, and we dereferenced a NULL pointer:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
  IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820

Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just
like Root Ports do, so link->root for these devices should also point to
itself.

Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181
Tested-by: lists@ssl-mail.com
Tested-by: Jayachandran C. <jnair@caviumnetworks.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v4.2+

path: root/sound/firewire/Makefile

# To find a header included by define_trace.h.
CFLAGS_amdtp-stream.o	:= -I$(src)

snd-firewire-lib-objs := lib.o iso-resources.o packets-buffer.o \
			 fcp.o cmp.o amdtp-stream.o amdtp-am824.o
snd-isight-objs := isight.o

obj-$(CONFIG_SND_FIREWIRE_LIB) += snd-firewire-lib.o
obj-$(CONFIG_SND_DICE) += dice/
obj-$(CONFIG_SND_OXFW) += oxfw/
obj-$(CONFIG_SND_ISIGHT) += snd-isight.o
obj-$(CONFIG_SND_FIREWORKS) += fireworks/
obj-$(CONFIG_SND_BEBOB) += bebob/
obj-$(CONFIG_SND_FIREWIRE_DIGI00X) += digi00x/
obj-$(CONFIG_SND_FIREWIRE_TASCAM) += tascam/