linux.git/drivers/usb/core/hcd.c, branch v2.6.29

USB: mark "reject" field of struct urb as atomic_t

2009-01-07T18:00:08+00:00

It is enough to protect accesses to reject field of urb
by marking it as atomic_t,also it is the only reason of
existence of usb_reject_lock,so remove the lock to make
code more clean.

Signed-off-by: Ming Lei 
Acked-off-by: Alan Stern 
Signed-off-by: Greg Kroah-Hartman

USB: Enhance usage of pm_message_t

2009-01-07T18:00:03+00:00

This patch (as1177) modifies the USB core suspend and resume
routines.  The resume functions now will take a pm_message_t argument,
so they will know what sort of resume is occurring.  The new argument
is also passed to the port suspend/resume and bus suspend/resume
routines (although they don't use it for anything but debugging).

In addition, special pm_message_t values are used for user-initiated,
device-initiated (i.e., remote wakeup), and automatic suspend/resume.
By testing these values, drivers can tell whether or not a particular
suspend was an autosuspend.  Unfortunately, they can't do the same for
resumes -- not until the pm_message_t argument is also passed to the
drivers' resume methods.  That will require a bigger change.

IMO, the whole Power Management framework should have been set up this
way in the first place.

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

USB: Allow usbmon as a module even if usbcore is builtin

2009-01-07T17:59:54+00:00

usbmon can only be built as a module if usbcore is a module too. Trivial
changes to the relevant Kconfig and Makefile (and a few trivial changes
elsewhere) allow usbmon to be built as a module even if usbcore is
builtin.

This is verified to work in all 9 permutations (3 correctly prohibited
by Kconfig, 6 build a suitable result).

Signed-off-by: Paul Bolle 
Signed-off-by: Pete Zaitcev 
Signed-off-by: Greg Kroah-Hartman

USB: fix crash when URBs are unlinked after the device is gone

2008-10-29T21:54:40+00:00

This patch (as1151) protects usbcore against drivers that try to
unlink an URB after the URB's device or bus have been removed.  The
core does not currently check for this, and certain drivers can cause
a crash if they are running while an HCD is unloaded.

Certainly it would be best to fix the guilty drivers.  But a little
defensive programming doesn't hurt, especially since it appears that
quite a few drivers need to be fixed.

The patch prevents the problem by grabbing a reference to the device
while an unlink is in progress and using a new spinlock to synchronize
unlinks with device removal.  (There's no need to acquire a reference
to the bus as well, since the device structure itself keeps a
reference to the bus.)  In addition, the kerneldoc is updated to
indicate that URBs should not be unlinked after the disconnect method
returns.

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

USB: EHCI: log a warning if ehci-hcd is not loaded first

2008-10-17T21:41:03+00:00

This patch (as1139) adds a warning to the system log whenever ehci-hcd
is loaded after ohci-hcd or uhci-hcd.  Nowadays most distributions are
pretty good about not doing this; maybe the warning will help convince
anyone still doing it wrong.

Signed-off-by: Alan Stern 
Cc: stable   [2.6.27]
Signed-off-by: Greg Kroah-Hartman

device create: usb: convert device_create_drvdata to device_create

2008-10-16T16:24:45+00:00

Now that device_create() has been audited, rename things back to the
original call to be sane.

Signed-off-by: Greg Kroah-Hartman

USB: fix hcd interrupt disabling

2008-09-23T20:58:06+00:00

Commit de85422b94ddb23c021126815ea49414047c13dc, 'USB: fix interrupt
disabling for HCDs with shared interrupt handlers' changed usb_add_hcd()
to strip IRQF_DISABLED from irqflags prior to calling request_irq()
with the justification that such a removal was necessary for shared
interrupts to work properly.  Unfortunately, the change in that commit
unconditionally removes the IRQF_DISABLED flag, causing problems on
platforms that don't use a shared interrupt but require IRQF_DISABLED.
This change adds a check for IRQF_SHARED prior to removing the
IRQF_DISABLED flag.

Fixes the PS3 system startup hang reported with recent Fedora and
OpenSUSE kernels.

Note that this problem is hidden when CONFIG_LOCKDEP=y (ps3_defconfig),
as local_irq_enable_in_hardirq() is defined as a null statement for
that config.

CC: stable 
Signed-off-by: Geoff Levand 
Cc: Alan Stern 
Cc: Stefan Becker 
Signed-off-by: Greg Kroah-Hartman

USB: automatically enable RHSC interrupts

2008-08-21T17:26:38+00:00

This patch (as1069c) changes the way OHCI root-hub status-change
interrupts are enabled.  Currently a special HCD method,
hub_irq_enable(), is called when the hub driver is finished using a
root hub.  This approach turns out to be subject to races, resulting
in unnecessary polling.

The patch does away with the method entirely.  Instead, the driver
automatically enables the RHSC interrupt when no more status changes
are present.  This scheme is safe with controllers using
level-triggered semantics for their interrupt flags.

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

USB: usb dev_name() instead of dev->bus_id

2008-07-21T22:15:46+00:00

The bus_id field is going away, use the dev_name() function instead.

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

USB: handle pci_name() being const

2008-07-21T22:15:46+00:00

This changes usb_create_hcd() to be able to handle the fact that
pci_name() has changed to a constant string.

Signed-off-by: Greg Kroah-Hartman