More duplicated code gone.

Also, remove the unused skb argument from xmit_pull_req_b().

More obviously duplicated code moved into just one place.

Again, lots of drivers duplicated code to start transmitting a
B-channel frame. Now we do this from one place, and the converted
drivers are obviously serialized w.r.t. calling ->BC_Send_Data()

Again, this code sequence is repeated in a lot of drivers, so 
separate it out.

There's no need for each hardware driver to implement its own
(short) xxx_schedule_event().

We used to call writewakeup() directly from handling the "frame sent"
IRQ which potentially would call back up into the common ISDN layer and
higher up still in hard-IRQ context. Instead, queue the event and use
the usual mechanism of passing it up.

Whoever did the tqueue -> workqueue changes didn't really care to look
at how it was used in the HiSax driver, making the driver compile but
oops with NULL pointer derefs.

Oh, and workqueues are really not the right solution here, tasklets are.
But that's for later.

Patches by Frank Davis.

This is the next iteration of the workqueue abstraction.

The framework includes:

 - per-CPU queueing support.

on SMP there is a per-CPU worker thread (bound to its CPU) and per-CPU
work queues - this feature is completely transparent to workqueue-users.
keventd automatically uses this feature. XFS can now update to work-queues
and have the same per-CPU performance as it had with its per-CPU worker
threads.

 - delayed work submission

there's a new queue_delayed_work(wq, work, delay) function and a new
schedule_delayed_work(work, delay) function. The later one is used to
correctly fix former tq_timer users. I've reverted those changes in 2.5.40
that changed tq_timer uses to schedule_work() - eg. in the case of
random.c or the tty flip queue it was definitely the wrong thing to do.

delayed work means a timer embedded in struct work_struct.  I considered
using split struct work_struct and delayed_work_struct types, but lots
of code actively uses task-queues in both delayed and non-delayed mode,
so i went for the more generic approach that allows both methods of work
submission.  Delayed timers do not cause any other overhead in the
normal submission path otherwise.

 - multithreaded run_workqueue() implementation

the run_workqueue() function can now be called from multiple contexts, and
a worker thread will only use up a single entryy - this property is used
by the flushing code, and can potentially be used in the future to extend
the number of per-CPU worker threads.

 - more reliable flushing

there's now a 'pending work' counter, which is used to accurately detect
when the last work-function has finished execution. It's also used to
correctly flush against timed requests. I'm not convinced whether the old
keventd implementation got this detail right.

 - i switched the arguments of the queueing function(s) per Jeff's
   suggestion, it's more straightforward this way.


Driver fixes:

i have converted almost every affected driver to the new framework. This
cleaned up tons of code. I also fixed a number of drivers that were still
using BHs (these drivers did not compile in 2.5.40).

while this means lots of changes, it might ease the QA decision whether to
put this patch into 2.5.

The pach converts roughly 80% of all tqueue-using code to workqueues - and
all the places that are not converted to workqueues yet are places that do
not compile in vanilla 2.5.40 anyway, due to unrelated changes. I've
converted a fair number of drivers that do not compile in 2.5.40, and i
think i've managed to convert every driver that compiles under 2.5.40.

#define __NO_VERSION__ has been unnecessary for a long time, so here it
goes...

(Rusty Russell)

(by Guy Ellis)

(by Christoph Ersfeld/Karsten Keil)

Move netjet driver to new PCI DMA API.

- Al Viro: VFS inode allocation moved down to filesystem, trim inodes
- Greg KH: USB update, hotplug documentation
- Kai Germaschewski: ISDN update
- Ingo Molnar: scheduler tweaking ("J2")
- Arnaldo: emu10k kdev_t updates
- Ben Collins: firewire updates
- Björn Wesen: cris arch update
- Hal Duston: ps2esdi driver bio/kdev_t fixes
- Jean Tourrilhes: move wireless drivers into drivers/net/wireless,
update wireless API #1
- Richard Gooch: devfs race fix
- OGAWA Hirofumi: FATFS update

  - me/Al Viro: fix bdget() oops with block device modules that don't
  clean up after they exit
  - Alan Cox: continued merging (drivers, license tags)
  - David Miller: sparc update, network fixes
  - Christoph Hellwig: work around broken drivers that add a gendisk more
  than once
  - Jakub Jelinek: handle more ELF loading special cases
  - Trond Myklebust: NFS client and lockd reclaimer cleanups/fixes
  - Greg KH: USB updates
  - Mikael Pettersson: sparate out local APIC / IO-APIC config options

  - make sure "sync()" doesn't effectively lock up the machine by
  overloading all the IO resources
  - fix up some network memory allocations that don't wan tto wait on IO.
  - merge with Alan (including MIPS update)
  - Jeff Garzik: network driver updates.
  - Al Viro: System V FS update (write capability, page cache, mondo cleanups)
  - Kai Germaschewski: ISDN cleanups, TURBOPAM driver by Stelian Pop
  - Ben Fennema: UDF update (time handling, i_blocks fix)
  - Neil Brown: md error handling improvements, knfsd file handle compatibility
  - Paul Mackerras: PPC update
  - Jakub Jelinek: fix up kernel linker scripts to accept .rodata better
  - Patrick Mochel: fix PME handling in pci_enable_wake()
  - Chris Mason: reiserfs PF_MEMALLOC handling

  - Chris Mason: reiserfs, another null bytes bug
  - Andrea Arkangeli: make SMP Athlon build
  - Alexander Zarochentcev: reiserfs directory fsync SMP locking fix
  - Jeff Garzik: PCI network driver updates
  - Alan Cox: continue merging
  - Ingo Molnar: fix RAID AUTORUN ioctl, scheduling improvements

  - driver sync up with Alan
  - Andrew Morton: wakeup cleanup and race fix
  - Paul Mackerras: macintosh driver updates.
  - don't trust "page_count()" on reserved pages!
  - Russell King: fix serious IDE multimode write bug!
  - me, Jens, others: fix elevator problem
  - ARM, MIPS and cris architecture updates
  - alpha updates: better page clear/copy, avoid kernel lock in execve
  - USB and firewire updates
  - ISDN updates
  - Irda updates