linux.git/drivers/usb/core/devio.c, branch v2.6.21.7

USB: set the correct interval for interrupt URBs

2007-03-10T03:52:23+00:00

This patch (as862) fixes a couple of bugs in the way usbcore handles
intervals for interrupt URBs.  usb_interrupt_msg (and usb_bulk_msg for
backward compatibility) don't set the interval correctly for
high-speed devices.  proc_do_submiturb() doesn't set it correctly when
a bulk URB is submitted to an interrupt endpoint.

Signed-off-by: Alan Stern 
Signed-off-by: Greg Kroah-Hartman

USB: unconfigure devices which have config 0

2007-02-16T23:32:21+00:00

Some USB devices do have a configuration 0, in contravention of the
USB spec.  Normally 0 is supposed to indicate that a device is
unconfigured.

While we can't change what the device is doing, we can change usbcore.
This patch (as852) allows usb_set_configuration() to accept a config
value of -1 as indicating that the device should be unconfigured.  The
request actually sent to the device will still contain 0 as the value.
But even if the device does have a configuration 0, dev->actconfig
will be set to NULL and dev->state will be set to USB_STATE_ADDRESS.

Without some sort of special-case handling like this, there is no way
to unconfigure these non-compliant devices.

Signed-off-by: Alan Stern 
Signed-off-by: Greg Kroah-Hartman

USB: devio.c add missing INIT_LIST_HEAD()

2007-02-07T23:44:33+00:00

It should hopefully fix the list corruption bug on:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=214402

Add a missing INIT_LIST_HEAD()

Signed-off-by: Dan Carpenter 
Signed-off-by: Greg Kroah-Hartman

USB: move usb_device_class class devices to be real devices

2007-02-07T23:44:30+00:00

This moves the usb class devices that control the usbfs nodes to show up
in the proper place in the larger device tree.

Cc: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

USB: fix to usbfs_snoop logging of user defined control urbs

2006-12-20T18:14:28+00:00

When sending CONTROL URB's using the usual CONTROL ioctl, logging works
fine, but when sending them via SUBMITURB, like VMWare does, the
control fields are not logged.  This patch fixes that.

I didn't see any major changes to devio.c recently, so this patch should apply
cleanly to even the latest kernel.  I can resubmit if it doesn't.

From: Chris Frey 
Signed-off-by: Greg Kroah-Hartman

usbcore: remove unused argument in autosuspend

2006-12-01T22:25:53+00:00

Thanks to several earlier patches, usb_autosuspend_device() and
usb_autoresume_device() are never called with a second argument other
than 1.  This patch (as819) removes the now-redundant argument.

It also consolidates some common code between those two routines,
putting it into a new subroutine called usb_autopm_do_device().  And
it includes a sizable kerneldoc update for the affected functions.

Signed-off-by: Alan Stern 
Signed-off-by: Greg Kroah-Hartman

usb devio: handle class_device_create() error

2006-10-17T21:46:32+00:00

This patch adds missing class_device_create() error check,
and makes notifier return NOTIFY_BAD.

Signed-off-by: Akinobu Mita 
Signed-off-by: Greg Kroah-Hartman

[PATCH] devio __user annotations

2006-10-10T22:37:21+00:00

Signed-off-by: Al Viro 
Signed-off-by: Linus Torvalds

IRQ: Maintain regs pointer globally rather than passing to IRQ handlers

2006-10-05T14:10:12+00:00

Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells 
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)

[PATCH] usb: fixup usb so it uses struct pid

2006-10-02T14:57:15+00:00

The problem with remembering a user space process by its pid is that it is
possible that the process will exit, pid wrap around will occur.
Converting to a struct pid avoid that problem, and paves the way for
implementing a pid namespace.

Also since usb is the only user of kill_proc_info_as_uid rename
kill_proc_info_as_uid to kill_pid_info_as_uid and have the new version take
a struct pid.

Signed-off-by: Eric W. Biederman 
Acked-by: Greg Kroah-Hartman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds