Robin Murphy d89e2378a9 drivers: flag buses which demand DMA configuration ... We do not want the common dma_configure() pathway to apply indiscriminately to all devices, since there are plenty of buses which do not have DMA capability, and if their child devices were used for DMA API calls it would only be indicative of a driver bug. However, there are a number of buses for which DMA is implicitly expected even when not described by firmware - those we whitelist with an automatic opt-in to dma_configure(), assuming that the DMA address space and the physical address space are equivalent if not otherwise specified. Commit 7232888366 ("of: restrict DMA configuration") introduced a short-term fix by comparing explicit bus types, but this approach is far from pretty, doesn't scale well, and fails to cope at all with bus drivers which may be built as modules, like host1x. Let's refine things by making that opt-in a property of the bus type, which neatly addresses those problems and lets the decision of whether firmware description of DMA capability should be optional or mandatory stay internal to the bus drivers themselves. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Christoph Hellwig <hch@lst.de>		2017-10-19 16:34:52 +02:00
..
acpi	ACPI / bus: Make ACPI_HANDLE() work for non-GPL code again	2017-09-19 22:42:31 +02:00
asm-generic	percpu: make this_cpu_generic_read() atomic w.r.t. interrupts	2017-09-26 07:37:33 -07:00
clocksource
crypto
drm
dt-bindings	ARC: reset: remove the misleading v1 suffix all over	2017-09-18 13:02:03 +02:00
keys
kvm
linux	drivers: flag buses which demand DMA configuration	2017-10-19 16:34:52 +02:00
math-emu
media
memory
misc
net	udp: perform source validation for mcast early demux	2017-10-01 03:55:47 +01:00
pcmcia
ras
rdma	IB: Correct MR length field to be 64-bit	2017-09-25 11:47:23 -04:00
scsi	scsi: libiscsi: Remove iscsi_destroy_session	2017-10-02 22:23:21 -04:00
soc
sound	ALSA: seq: Fix copy_from_user() call inside lock	2017-10-09 14:10:13 +02:00
target
trace	sched/debug: Add explicit TASK_PARKED printing	2017-09-29 11:02:57 +02:00
uapi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf	2017-10-09 10:39:52 -07:00
video
xen	xen, arm64: drop dummy lookup_address()	2017-09-19 09:25:05 -04:00