Commit graph

431 commits

Author SHA1 Message Date
Linus Torvalds
f815c335d2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  firewire: sbp2: fix freeing of unallocated memory
  firewire: ohci: fix Ricoh R5C832, video reception
  firewire: ohci: fix Agere FW643 and multiple cameras
  firewire: core: fix crash in iso resource management
2009-09-05 14:59:00 -07:00
Stefan Richter
baed6b82d9 firewire: sbp2: fix freeing of unallocated memory
If a target writes invalid status (typically status of a command that
already timed out), firewire-sbp2 attempts to put away an ORB that
doesn't exist.  https://bugzilla.redhat.com/show_bug.cgi?id=519772

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-09-05 15:59:34 +02:00
Stefan Richter
4fe0badd58 firewire: ohci: fix Ricoh R5C832, video reception
In dual-buffer DMA mode, no video frames are ever received from R5C832
by libdc1394.  Fallback to packet-per-buffer DMA works reliably.
http://thread.gmane.org/gmane.linux.kernel.firewire.devel/13393/focus=13476

Reported-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-09-05 15:59:34 +02:00
Stefan Richter
fc383796a8 firewire: ohci: fix Agere FW643 and multiple cameras
An Agere FW643 OHCI 1.1 card works fine for video reception from one
camera but fails early if receiving from two cameras.  After a short
while, no IR IRQ events occur and the context control register does not
react anymore.  This happens regardless whether both IR DMA contexts are
dual-buffer or one is dual-buffer and the other packet-per-buffer.

This can be worked around by disabling dual buffer DMA mode entirely.
http://sourceforge.net/mailarchive/message.php?msg_name=4A7C0594.2020208%40gmail.com
(Reported by Samuel Audet.)

In another report (by Jonathan Cameron), an FW643 works OK with two
cameras in dual buffer mode.  Whether this is due to different chip
revisions or different usage patterns (different video formats) is not
yet clear.  However, as far as the current capabilities of
firewire-core's isochronous I/O interface are concerned, simply
switching off dual-buffer on non-working and working FW643s alike is not
a problem in practice.  We only need to revisit this issue if we are
going to enhance the interface, e.g. so that applications can explicitly
choose modes.

Reported-by: Samuel Audet <samuel.audet@gmail.com>
Reported-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-09-05 15:59:34 +02:00
Stefan Richter
1821bc19d5 firewire: core: fix crash in iso resource management
This fixes a regression due to post 2.6.30 commit "firewire: core: do
not DMA-map stack addresses" 6fdc037094.

As David Moore noted, a previously correct sizeof() expression became
wrong since the commit changed its argument from an array to a pointer.
This resulted in an oops in ohci_cancel_packet in the shared workqueue
thread's context when an isochronous resource was to be freed.

Reported-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-09-05 15:59:34 +02:00
Linus Torvalds
f63bafe556 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  ieee1394: sbp2: add support for disks >2 TB (and 16 bytes long CDBs)
  firewire: sbp2: add support for disks >2 TB (and 16 bytes long CDBs)
  firewire: core: do not DMA-map stack addresses
2009-07-06 14:03:44 -07:00
Stefan Richter
af2719415a firewire: sbp2: add support for disks >2 TB (and 16 bytes long CDBs)
Increase the command ORB data structure to transport up to 16 bytes long
CDBs (instead of 12 bytes), and tell the SCSI mid layer about it.  This
is notably necessary for READ CAPACITY(16) and friends, i.e. support of
large disks.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-07-02 21:27:01 +02:00
Stefan Richter
6fdc037094 firewire: core: do not DMA-map stack addresses
The DMA mapping API cannot map on-stack addresses, as explained in
Documentation/DMA-mapping.txt.  Convert the two cases of on-stack packet
payload buffers in firewire-core (payload of lock requests in the bus
manager work and in iso resource management) to slab-allocated memory.

There are a number on-stack buffers for quadlet write or quadlet read
requests in firewire-core and firewire-sbp2.  These are harmless; they
are copied to/ from card driver internal DMA buffers since quadlet
payloads are inlined with packet headers.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-25 19:42:36 +02:00
Linus Torvalds
1053414068 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  firewire: new stack is no longer experimental
  firewire: net: better FIFO address range check and rcodes
  firewire: net: fix card driver reloading
  firewire: core: fix iso context shutdown on card removal
  firewire: core: fix DMA unmapping in iso buffer removal
  firewire: net: adjust net_device ops
  firewire: net: remove unused code
  firewire: net: allow for unordered unit discovery
  firewire: net: style changes
  firewire: net: add Kconfig item, rename driver
  firewire: add IPv4 support
2009-06-22 21:29:52 -07:00
Stefan Richter
0c53decdd0 firewire: new stack is no longer experimental
The new stack is now recommended over the old one if used for industrial
video (IIDC/DCAM) or for storage devices (SBP-2) due to better
performance, improved compatibility, added features, and security.  It
should also be functionally on par with and is more secure than the old
ieee1394 stack in the use case of consumer video devices.

IP-over-1394 support for the new stack is currently emerging, and a
backend of the firedtv DVB driver to the new stack should be available
soon.

The one remaining area where the old stack is still required are audio
devices, as the new stack is not yet able to support the FFADO FireWire
audio framework.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-21 10:53:26 +02:00
Linus Torvalds
f83b1e616f Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  firewire: core: use more outbound tlabels
  firewire: core: don't update Broadcast_Channel if RFC 2734 conditions aren't met
  firewire: core: prepare for non-core children of card devices
  firewire: core: include linux/uaccess.h instead of asm/uaccess.h
  firewire: add parent-of-unit accessor
  firewire: rename source files
  firewire: reorganize header files
  firewire: clean up includes
  firewire: ohci: access bus_seconds atomically
  firewire: also use vendor ID in root directory for driver matches
  firewire: share device ID table type with ieee1394
  firewire: core: add sysfs attribute for easier udev rules
  firewire: core: check for missing struct update at build time, not run time
  firewire: core: improve check for local node
2009-06-16 14:29:46 -07:00
Stefan Richter
00635b8ee2 firewire: net: better FIFO address range check and rcodes
The AR req handler should not check the generation; higher level code
is the better place to handle bus generation changes.  The target node
ID just needs to be checked for not being the "all nodes" address; in
this case don't handle the request and don't respond.

Use Address_Error and Type_Error rcodes as appropriate.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-16 22:48:09 +02:00
Stefan Richter
b01b4babbf firewire: net: fix card driver reloading
Fix some problems from "firewire: net: allow for unordered unit
discovery":
  - fwnet_remove was missing a list_del, causing fwnet_probe to crash if
    called after fwnet_remove, e.g. if firewire-ohci was unloaded and
    reloaded.
  - fwnet_probe should set its new_netdev flag only if it actually
    allocated a net_device.
  - Use dev_set_drvdata and dev_get_drvdata instead of deprecated direct
    access to device.driver_data.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-16 22:48:09 +02:00
Stefan Richter
d645f4dad0 firewire: core: fix iso context shutdown on card removal
If isochronous contexts existed when firewire-ohci was unloaded, the
core iso shutdown functions crashed with NULL dereferences, and buffers
etc. weren't released.

How the fix works:  We first copy the card driver's iso shutdown hooks
into the dummy driver, then fw_destroy_nodes notifies upper layers of
devices going away, these should shut down (including their iso
contexts), wait_for_completion(&card->done) will be triggered after
upper layers gave up all fw_device references, after which the card
driver's shutdown proceeds.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-16 22:48:09 +02:00
Stefan Richter
29ad14cddd firewire: core: fix DMA unmapping in iso buffer removal
dmap_unmap_page() shall use the same direction as dma_map_page().

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-16 22:48:09 +02:00
Greg Kroah-Hartman
d961450da5 firewire: remove driver_data direct access of struct device
In the near future, the driver core is going to not allow direct access
to the driver_data pointer in struct device.  Instead, the functions
dev_get_drvdata() and dev_set_drvdata() should be used.  These functions
have been around since the beginning, so are backwards compatible with
all older kernel versions.

Cc: linux1394-devel@lists.sourceforge.net
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: Kristian Hoegsberg <krh@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:30:26 -07:00
Stefan Richter
1337f8535a firewire: net: adjust net_device ops
The .ndo_tx_timeout callback is currently without function; delete it.
Give .watchdog_timeo a proper time value; lower it to 2 seconds.

Decrease the .tx_queue_len from 1000 (as in Ethernet card drivers) to 10
because we have only 64 transaction labels available, and responders
might have further limits of their AR req contexts.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-14 14:26:29 +02:00
Stefan Richter
156ce867a6 firewire: net: remove unused code
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-14 14:26:29 +02:00
Stefan Richter
5a124d382e firewire: net: allow for unordered unit discovery
Decouple the creation and destruction of the net_device from the order
of discovery and removal of nodes with RFC 2734 unit directories since
there is no reliable order.  The net_device is now created when the
first RFC 2734 unit on a card is discovered, and destroyed when the last
RFC 2734 unit on a card went away.  This includes all remote units as
well as the local unit, which is therefore tracked as a peer now too.

Also, locking around the list of peers is slightly extended to guard
against peer removal.  As a side effect, fwnet_peer.pdg_lock has become
superfluous and is deleted.

Peer data (max_rec, speed, node ID, generation) are updated more
carefully.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-14 14:26:29 +02:00
Stefan Richter
f91e3bd842 firewire: net: style changes
Change names of types, variables, functions.
Omit debug code.
Use get_unaligned*, put_unaligned*.
Annotate big endian data.
Handle errors in __init.
Change whitespace.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-14 14:26:29 +02:00
Stefan Richter
b9530fd6c3 firewire: net: add Kconfig item, rename driver
The driver is now called firewire-net.  It might implement the transport
of other networking protocols in the future, notably IPv6 per RFC 3146.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-14 14:26:29 +02:00
Jay Fenlason
c76acec6d5 firewire: add IPv4 support
Implement IPv4 over IEEE 1394 as per RFC 2734 for the newer firewire
stack.  This feature has only been present in the older ieee1394 stack
via the eth1394 driver.

Still to do:
  - fix ipv4_priv and ipv4_node lifetime logic
  - fix determination of speeds and max payloads
  - fix bus reset handling
  - fix unaligned memory accesses
  - fix coding style
  - further testing/ improvement of fragment reassembly
  - perhaps multicast support

Signed-off-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (rebased, copyright note, changelog)
2009-06-14 14:26:28 +02:00
Stefan Richter
1e626fdcef firewire: core: use more outbound tlabels
Tlabel is a 6 bits wide datum.  Wrap it after 63 rather than 31 for more
safety against transaction label exhaustion and potential responders'
transaction layer bugs.  (As noted by Guus Sliepen, this change requires
an expansion of tlabel_mask to 64 bits.)

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-14 14:23:42 +02:00
Stefan Richter
837ec787d8 firewire: core: don't update Broadcast_Channel if RFC 2734 conditions aren't met
This extra check will avoid Broadcast_Channel register related traffic
to many IIDC, SBP-2, and AV/C devices which aren't IRMC or have a
max_rec < 8 (i.e. support < 512 bytes async payload).  This avoids a
little bit of traffic after bus reset and is even more careful with
devices which don't implement this CSR.

The assumption is that no other protocol than IP over 1394 uses the
broadcast channel for streams.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-14 11:57:06 +02:00
Stefan Richter
099d54143e firewire: core: prepare for non-core children of card devices
The IP-over-1394 driver will add child devices beneath card devices
which are not of type fw_device.  Hence firewire-core's callbacks in
device_for_each_child() and device_find_child() need to check for the
device type now.

Initial version written by Jay Fenlason.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-06 21:45:50 +02:00
Stefan Richter
e034d24259 firewire: core: include linux/uaccess.h instead of asm/uaccess.h
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-06 21:45:50 +02:00
Stefan Richter
e5110d011e firewire: add parent-of-unit accessor
Retrieval of an fw_unit's parent is a common pattern in high-level code.
Wrap it up as device = fw_parent_device(unit).

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-06 21:45:50 +02:00
Stefan Richter
e71d31da06 firewire: rename source files
The source files of firewire-core, firewire-ohci, firewire-sbp2, i.e.
 "drivers/firewire/fw-*.c"
are renamed to
 "drivers/firewire/core-*.c",
 "drivers/firewire/ohci.c",
 "drivers/firewire/sbp2.c".

The old fw- prefix was redundant to the directory name.  The new core-
prefix distinguishes the files according to which driver they belong to.

This change comes a little late, but still before further firewire
drivers are added as anticipated RSN.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-05 16:26:18 +02:00
Stefan Richter
77c9a5daa9 firewire: reorganize header files
The three header files of firewire-core, i.e.
 "drivers/firewire/fw-device.h",
 "drivers/firewire/fw-topology.h",
 "drivers/firewire/fw-transaction.h",
are replaced by
 "drivers/firewire/core.h",
 "include/linux/firewire.h".

The latter includes everything which a firewire high-level driver (like
firewire-sbp2) needs besides linux/firewire-constants.h, while core.h
contains the rest which is needed by firewire-core itself and by low-
level drivers (card drivers) like firewire-ohci.

High-level drivers can now also reside outside of drivers/firewire
without having to add drivers/firewire to the header file search path in
makefiles.  At least the firedtv driver will be such a driver.

I also considered to spread the contents of core.h over several files,
one for each .c file where the respective implementation resides.  But
it turned out that most core .c files will end up including most of the
core .h files.  Also, the combined core.h isn't unreasonably big, and it
will lose more of its contents to linux/firewire.h anyway soon when more
firewire drivers are added.  (IP-over-1394, firedtv, and there are plans
for one or two more.)

Furthermore, fw-ohci.h is renamed to ohci.h.  The name of core.h and
ohci.h is chosen with regard to name changes of the .c files in a
follow-up change.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-05 16:26:18 +02:00
Stefan Richter
e8ca97021c firewire: clean up includes
Include required headers which were only indirectly included.
Remove unused includes and an unused constant.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-05 16:26:17 +02:00
Stefan Richter
3dcdc50079 firewire: ohci: access bus_seconds atomically
In the unlikely event that card->driver->get_bus_time() is called during
a cycle64Seconds interrupt, we could read garbage unless atomic accesses
are used.

The switch to atomic ops requires to change the 64 seconds counter from
unsigned to signed, but this shouldn't matter to the end result.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-05 16:26:17 +02:00
Stefan Richter
e41f8d709c firewire: also use vendor ID in root directory for driver matches
Due to AV/C protocol extensions, FireDTV devices need a vendor-specific
driver.  But their configuration ROM features a vendor ID only in the
root directory, not in the unit directory.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-05 16:26:17 +02:00
Stefan Richter
b3b2988841 firewire: share device ID table type with ieee1394
That way, the new firedtv driver will be able to use a single ID table
in builds against ieee1394 core and/or against firewire core.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-05 16:26:17 +02:00
Stefan Richter
0210b66dd8 firewire: core: add sysfs attribute for easier udev rules
This adds the attribute /sys/bus/firewire/devices/fw[0-9]+/units.  It
can be used in udev rules like the following ones:

# IIDC devices: industrial cameras and some webcams
SUBSYSTEM=="firewire", ATTR{units}=="*0x00a02d:0x00010?*", GROUP="video"

# AV/C devices: camcorders, set-top boxes, TV sets, audio devices, ...
SUBSYSTEM=="firewire", ATTR{units}=="*0x00a02d:0x010001*", GROUP="video"

Background:

firewire-core manages two device types:
  - fw_device is a FireWire node.  A character device file is associated
    with it.
  - fw_unit is a unit directory on a node.  Each fw_device may have 0..n
    children of type fw_unit.  The units tell us what kinds of protocols
    a node implements.

We want to set ownership or ACLs or permissions of the character device
file of an fw_device, or/and create symlinks to it, based on available
protocols.  Until now udev rules had to look at the fw_unit devices and
then modify their parent's character device file accordingly.  This is
problematic for two reasons:  1) It happens sometime after the creation
of the fw_device, 2) an access policy may require that information from
all children is evaluated before a decision about the parent is made.

Problem 1) can ultimately not be avoided since this is the nature of
FireWire nodes:  They may add or remove unit directories at any point in
time.

However, we can still help userland a lot by providing the protocol type
information of all units in a summary sysfs attribute directly at the
fw_device.  This way,
   - the information is immediately available at the affected device
     when userspace goes about to handle an ADD or CHANGE event of the
     fw_device,
   - with most policies, it won't be necessary anymore to dig through
     child attributes.

The new attribute is called "units".  It contains space-separated tuples
of specifier_id and version of each present unit.  The delimiter within
tuples is a colon.  Specifier_id and version are printed as 0x%06x.

Here is an example of a node which implements an IPv4 unit and an IPv6
unit:  $ cat /sys/bus/firewire/devices/fw2/units
0x00005e:0x000001 0x00005e:0x000002

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-01 12:48:49 +02:00
Stefan Richter
e5333db928 firewire: core: check for missing struct update at build time, not run time
struct fw_attribute_group.attrs.[] must have enough room for all
attributes.  This can and should be checked at build time.

Our previous check at run time was a little late and not reliable since
most of the time less than the available attributes are populated.

Furthermore, omit an increment of an index at its last usage.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-06-01 12:48:49 +02:00
Stefan Richter
92368890d5 firewire: core: improve check for local node
My recently added test for a device being local in fw-cdev.c got it
slightly wrong:  Comparisons of node IDs are only valid if the
generation is current, which I forgot to check.  Normally, serialization
by card->lock takes care of this, but a device in FW_DEVICE_GONE state
will necessarily have a wrong generation and invalid node_id.

The "is it local?" check is made 100% correct and simpler now by means
of a struct fw_device flag which is set at fw_device creation.

Besides the fw-cdev site which was to be fixed, there is another site
which can make use of the new flag, and an RFC-2734 driver will benefit
from it too.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-05-17 14:13:47 +02:00
Stefan Richter
7889b60ee7 firewire: core: optimize propagation of BROADCAST_CHANNEL
Cache the test result of whether a device implements BROADCAST_CHANNEL.
This minimizes traffic on the bus after each bus reset.  A majority of
devices does not implement BROADCAST_CHANNEL.

Remove busy retries; just rely on the hardware to retry requests to busy
responders.  Remove unnecessary log messages.

Rename the flag is_irm to broadcast_channel_allocated to better reflect
its meaning.  Reset the flag earlier in fw_core_handle_bus_reset.

Pass the generation down as a call parameter; that way generation can't
be newer than card->broadcast_channel_allocated and device->node_id.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:52 +01:00
Stefan Richter
cbae787c0f firewire: core: simplify broadcast channel allocation
fw-iso.c has channel allocation code now, use it.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:51 +01:00
Stefan Richter
e1dc7cab43 firewire: core: increase bus manager grace period
Per IEEE 1394 clause 8.4.2.5, bus manager capable nodes which are not
incumbent shall wait at least 125ms before trying to establish
themselves as bus manager.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:51 +01:00
Stefan Richter
a38a00fdef firewire: core: drop unused call parameters of close_transaction
All callers inserted NULL and 0 here.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:51 +01:00
Stefan Richter
18e9b10fcd firewire: cdev: add closure to async stream ioctl
This changes the as yet unreleased FW_CDEV_IOC_SEND_STREAM_PACKET ioctl
to generate an fw_cdev_event_response event just like the other two
ioctls for asynchronous request transmission do.  This way, clients get
feedback on successful or unsuccessful transmission.

This also adds input validation for length, tag, channel, sy, speed.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:50 +01:00
Stefan Richter
664d8010b1 firewire: cdev: simplify FW_CDEV_IOC_SEND_REQUEST return value
This changes the ioctl() return value of FW_CDEV_IOC_SEND_REQUEST and of
the as yet unreleased FW_CDEV_IOC_SEND_BROADCAST_REQUEST.  They used to
return
	sizeof(struct fw_cdev_send_request *) + data_length

which is obviously a failed attempt to emulate the return value of
raw1394's respective interface which uses write() instead of ioctl().

However, the first summand, as size of a kernel pointer, is entirely
meaningless to clients and the second summand is already known to
clients.  And the result does not resemble raw1394's write() return
code anyway.

So simplify it to a constant non-negative value, i.e. 0.  The only
dangers here would be that future client implementations check for error
by ret != 0 instead of ret < 0 when running on top of an old kernel; or
that current clients interpret ret = 0 or more as failure.  But both are
hypothetical cases which don't justify to return irritating values.

While we touch this code, also remove "& 0x1f" from tcode in the call of
fw_send_request.  The tcode cannot be bigger than 0x1f at this point.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:50 +01:00
Stefan Richter
207fbefb18 firewire: cdev: fix race of ioctl_send_request with bus reset
The bus reset handler concurrently frees client->device->node.  Use
device->node_id instead.  This is equivalent to device->node->node_id
while device->generation is current.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:50 +01:00
Stefan Richter
de487da8ca firewire: cdev: secure add_descriptor ioctl
The access permissions and ownership or ACL of /dev/fw* character device
files will typically be set based on the device type of the respective
nodes, as obtained by firewire-core from descriptors in the device's
configuration ROM.  An example policy is to deny write permission by
default but grant write permission to files of AV/C video and audio
devices and IIDC video devices.

The FW_CDEV_IOC_ADD_DESCRIPTOR ioctl could be used to partly subvert
such a policy:  Find a device file with relaxed permissions, use the
ioctl to add a descriptor with AV/C marker to the local node's ROM, thus
gain access to the local node's character device file.  (This is only
possible if there are udev scripts installed which actively relax
permissions for known device types and if there is a device of such a
type connected.)

Accessibility of the local node's device file is relevant to host
security if the host contains two or more IEEE 1394 link layer
controllers which are plugged into a single bus.

Therefore change the ABI to deny FW_CDEV_IOC_ADD_DESCRIPTOR if the file
belongs to a remote node.  (This change has no impact on known
implementers of the ABI:  None of them uses the ioctl yet.)

Also clarify the documentation:  The ioctl affects all local nodes, not
just one local node.

Cc: stable@kernel.org
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:50 +01:00
Stefan Richter
c8a25900f3 firewire: cdev: amendment to "add ioctl to query maximum transmission speed"
The as yet unreleased FW_CDEV_IOC_GET_SPEED ioctl puts only a single
integer into the parameter buffer.  We can use ioctl()'s return value
instead.

(Also: Some whitespace change in firewire-cdev.h.)

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:49 +01:00
Jay Fenlason
6104ee92d6 firewire: broadcast channel support
This patch adds the ISO broadcast channel support that is required of a
1394a IRM.  In specific, if the local device the IRM, it allocates ISO
channel 31 and sets the broadcast channel register of all devices on the
local bus to BROADCAST_CHANNEL_INITIAL | BROADCAST_CHANNEL_VALID to indicate
that channel 31 can be use for broadcast messages.

One minor complication is that on startup the local device may become IRM
before all the devices on the bus have been enumerated by the stack.  Therefore
we have to keep a "the local device is IRM" flag and possibly set the
broadcast channel register of new devices at enumeration time.

Signed-off-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:49 +01:00
Jay Fenlason
f8c2287c65 firewire: implement asynchronous stream transmission
Allow userspace and other firewire drivers (fw-ipv4 I'm looking at
you!) to send Asynchronous Transmit Streams as described in 7.8.3 of
release 1.1 of the 1394 Open Host Controller Interface Specification.

Signed-off-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (tweaks)
2009-03-24 20:56:49 +01:00
Stefan Richter
ba27e1f7bf firewire: core: normalize a function argument name
It's called "payload" rather than "data" almost everywhere in
fw-transaction.c.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:48 +01:00
Stefan Richter
e1eff7a393 firewire: normalize a variable name
Standardize on  if (err)
                        handle_error;
           and  if (ret < 0)
                        handle_error;

Don't call a variable err if we store values in it which mean success.
Also, offset some return statements by a blank line since this how we do
it in drivers/firewire.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:48 +01:00
Stefan Richter
d01b017876 firewire: core: remove condition which is always false
reread_bus_info_block() only gets to see devices whose config_rom_length
is at least 6 (ROM header, bus info block, root directory header).

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:47 +01:00