Main points:
- receive buffers are decoupled from urbs, so an urb can be
resubmitted with a new buffer before the old buffer is processed.
- the packet reconstruction code is much simpler.
- locking is simplified by the fact that only the tasklet launches
receive urbs

Make the most discriminating comparison first.

The stats field is never NULL.

Always use dev_kfree_skb.

Calculate the maximum size needed for the SAR
reconstruction buffer from the supplied qos parameters.

Should have gone long ago.

Add a vdbg macro for verbose debugging, and convert some
noisy debugging statements to use it.

Replace spin_lock_irqsave/spin_unlock_irqrestore with
spin_lock_irq/spin_unlock_irq in tasklet actions, since
these are always called with local irqs enabled.

Replace spin_lock_irqsave/spin_unlock_irqrestore with
spin_lock_irq/spin_unlock_irq in routines that are only
called in process context.

Defend against future maintainers.

Use set_current_state (TASK_RUNNING); schedule(); instead.

No real code changes.

This patch touches the most significant places in usbcore
that need to respond to configuration change events:

  - set_interface changes altsettings; affects endpoints
    in both new and old settings (but not other endpoints).

  - set_configuration; affects every endpoint

The endpoints get disabled, flushing hardware state
reliably.  This resolves two FIXMEs here, part of one
in OHCI (ed_get) and all of one in EHCI (qh_append_tds).

Not many drivers currently use these code paths, but
now they should start to work properly.

Stefano Barbato wrote:
> Dual PIII
> kernel 2.4.21-rc2 (w/ SMP)  (2.5.69 below)
> ...
>
> I put a few printk before the BUG() and I found that the offending if() is
> this:
>         if(qh->qh_state != QH_STATE_LINKED
>                                 && qh->qh_state != QH_STATE_UNLINK_WAIT)
>
> because qh_state were QH_STATE_COMPLETING.

I got a similar SMP report recently, but without info about
which clause was failing -- which is a key clue, thanks!!

The COMPLETING state is used only while a QH is being
scanned for completed TDs.  (Think CPU-0 irq handler.)
Looking at the handful of places that call the routine
reporting the BUG(), a couple seem like they could make
trouble with multiple CPUs in the driver.

Alan Stern wrote:
> I suggest you just forget about acquiring the lock in status_dequeue() and
> simply leave it as
>
> 	del_timer_sync (&hcd->rh_timer);
> 	hcd->rh_timer.data = 0;

Hmm, so if some other URB gets queued in that window,
it'll get trashed?  Unlikely .. the clean fix would be
making the status endpoint have a real URB queue.

I combined your suggested change with two others:
(a) protect the status-unlink and control completion
    handlers against IRQs [ the cases Duncan noted]
(b) use mod_timer to retrigger the timer, instead of the
    heavy weight path.

into kroah.com:/home/linux/linux/BK/gregkh-2.5

Update ppc for mingo's do_fork changes.  Together with the pmac compile
fixes this allows me to stay at the bleeding edge with my my ibook..

This updates ppc64 for the do_fork() semantics change.

I completely misread this code and there was no bug.  In fact yesterday's fix
broke it.  Revert.

struct page is undefined in this file without this on Alpha.

From: Andi Kleen <ak@suse.de>

There is some assembly code in setup.c which doesn't explicitly set its
section.  It comes after a C function which is marked __init.  The compiler
does not reset the section after such C functions.  The assembly code is
going into .text.init.

That's the wrong section.  We get oopses modprobing sctp and, with Manfred's
unmap-free-pages debug patch we get oopses modprobing e100.ko.  In
apply_alternatives().

into nuts.ninka.net:/home/davem/src/BK/net-2.5

into nuts.ninka.net:/home/davem/src/BK/net-2.5

into nuts.ninka.net:/home/davem/src/BK/net-2.5

Support more chips and split out all the complex PHY
handling into a seperate file.

Revert the rtnl_lock API change, it is totally unneeded.
Instead we manage the todo work inside of net/core/dev.c

Also, we have to move sbin hotplug invocation outside of
the RTNL semaphore as well, both for register and unregister.

into home.transmeta.com:/home/torvalds/v2.5/linux

into tetrachloride.(none):/mnt/raid/src/kernel/2.5/agpgart