Move child's pointer to the struct usb_hub_port since the child device
is directly associated with the port. Provide usb_get_hub_child_device()
to get child's pointer.
Signed-off-by: NLan Tianyu <tianyu.lan@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add a simple helper function to allow drivers to obtain the physical
device location data.
Acked-by: NLen Brown <len.brown@intel.com>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>
Signed-off-by: NLan Tianyu <tianyu.lan@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

It's unreasonable to have CONFIG_ACPI for these in drivers, so add some
stub functions.
Signed-off-by: NMatthew Garrett <mjg@redhat.com>
Signed-off-by: NLan Tianyu <tianyu.lan@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

We have the chipidea driver now that supports both langwell and penwell,
so there is no need for this one any more.
Signed-off-by: NAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Some implementations need this limitation to work correctly.
Signed-off-by: NAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Split the driver into the following parts:
  * core  -- resources, register access, capabilities, etc;
  * udc   -- device controller functionality;
  * debug -- logging events.
Signed-off-by: NAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add iSerialNumber to usb_composite_driver to allow setting a default value.
This is useful when the module is compiled-in. Then the composite_bind
is executed at kernel boot and string id for iSerialNumber can be overridden
even if there is no iSerialNumber kernel commandline parameter.
If the string id is not overridden, then get_string will never attempt to
look for the alternative string contents using cdev->serial_override.
Signed-off-by: NAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add usb_remove_config to unbind a configuration and remove it from
the configs list. This allows implementing composite gadget drivers that
can disconnect themself from the bus and that will later be re-enumerated
with a different configuration.

Gadget drivers must call usb_gadget_disconnect before calling this
function to disable the pullup, disconnect the device from the host,
and prevent the host from enumerating the device while we are changing
the gadget configuration.
Signed-off-by: NBenoit Goby <benoit@android.com>
	[change return type of [usb_]remove_config]
Signed-off-by: NAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Acked-by: NMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This reworks the usb_serial_register_drivers() and
usb_serial_deregister_drivers() to not need a pointer to a struct
usb_driver anymore.  The usb_driver structure is now created dynamically
and registered and unregistered as needed.

This saves lines of code in each usb-serial driver.  All in-kernel users
of these functions were also fixed up at this time.  The pl2303 driver
was tested that everything worked properly.

Thanks for the idea to do this from Alan Stern.

Cc: Adhir Ramjiawan <adhirramjiawan0@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Al Borchers <alborchers@steinerpoint.com>
Cc: Aleksey Babahin <tamerlan311@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrew Worsley <amworsley@gmail.com>
Cc: Bart Hartgers <bart.hartgers@gmail.com>
Cc: Bill Pemberton <wfp5p@virginia.edu>
Cc: Dan Carpenter <error27@gmail.com>
Cc: Dan Williams <dcbw@redhat.com>
Cc: Donald Lee <donald@asix.com.tw>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Gary Brubaker <xavyer@ix.netcom.com>
Cc: Jesper Juhl <jj@chaosbits.net>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Johan Hovold <jhovold@gmail.com>
Cc: Julia Lawall <julia@diku.dk>
Cc: Kautuk Consul <consul.kautuk@gmail.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Lonnie Mendez <dignome@gmail.com>
Cc: Matthias Bruestle and Harald Welte <support@reiner-sct.com>
Cc: Matthias Urlichs <smurf@smurf.noris.de>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Michal Sroczynski <msroczyn@gmail.com>
Cc: "Michał Wróbel" <michal.wrobel@flytronic.pl>
Cc: Oliver Neukum <oliver@neukum.name>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Berger <pberger@brimson.com>
Cc: Preston Fick <preston.fick@silabs.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Rigbert Hamisch <rigbert@gmx.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Simon Arlott <simon@fire.lp0.eu>
Cc: Support Department <support@connecttech.com>
Cc: Thomas Tuttle <ttuttle@chromium.org>
Cc: Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>
Cc: Wang YanQing <Udknight@gmail.com>
Cc: William Greathouse <wgreathouse@smva.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

I can't remember why I wrote it like this many many years ago, but it's
not needed at all, let's rely on the usb-serial core for this function,
especially as it is being overridden by it anyway.

This lets us make usb_serial_probe() a static function, which it should
be.

Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This is now set by the usb-serial core, no need for the driver to
individually set it.

Thanks to Alan Stern for the idea to get rid of it.

Cc: William Greathouse <wgreathouse@smva.com>
Cc: Matthias Bruestle and Harald Welte <support@reiner-sct.com>
Cc: Lonnie Mendez <dignome@gmail.com>
Cc: Peter Berger <pberger@brimson.com>
Cc: Al Borchers <alborchers@steinerpoint.com>
Cc: Gary Brubaker <xavyer@ix.netcom.com>
Cc: Oliver Neukum <oliver@neukum.name>
Cc: Matthias Urlichs <smurf@smurf.noris.de>
Cc: Support Department <support@connecttech.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Kautuk Consul <consul.kautuk@gmail.com>
Cc: Bill Pemberton <wfp5p@virginia.edu>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Bart Hartgers <bart.hartgers@gmail.com>
Cc: Johan Hovold <jhovold@gmail.com>
Cc: Preston Fick <preston.fick@silabs.com>
Cc: Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>
Cc: Simon Arlott <simon@fire.lp0.eu>
Cc: Andrew Worsley <amworsley@gmail.com>
Cc: "Michał Wróbel" <michal.wrobel@flytronic.pl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Aleksey Babahin <tamerlan311@gmail.com>
Cc: Dan Carpenter <error27@gmail.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Donald Lee <donald@asix.com.tw>
Cc: Julia Lawall <julia@diku.dk>
Cc: Michal Sroczynski <msroczyn@gmail.com>
Cc: Wang YanQing <Udknight@gmail.com>
Cc: Dan Williams <dcbw@redhat.com>
Cc: Thomas Tuttle <ttuttle@chromium.org>
Cc: Rigbert Hamisch <rigbert@gmx.de>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Jesper Juhl <jj@chaosbits.net>
Cc: Adhir Ramjiawan <adhirramjiawan0@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Before this patch, ACPI_STATE_D3 incorrectly referenced D3hot
in some places, but D3cold in other places.

After this patch, ACPI_STATE_D3 always means ACPI_STATE_D3_COLD;
and all references to D3hot use ACPI_STATE_D3_HOT.

ACPI's _PR3 method is used to enter both D3hot and D3cold states.
What distinguishes D3hot from D3cold is the presence _PR3
(Power Resources for D3hot)  If these resources are all ON,
then the state is D3hot.  If _PR3 is not present,
or all _PR0 resources for the devices are OFF,
then the state is D3cold.

This patch applies after Linux-3.4-rc1.
A future syntax cleanup may remove ACPI_STATE_D3
to emphasize that it always means ACPI_STATE_D3_COLD.
Signed-off-by: NLin Ming <ming.m.lin@intel.com>
Acked-by: NRafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: NAaron Lu <aaron.lu@amd.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

The normal read_seqcount_begin() function will wait for any current
writers to exit their critical region by looping until the sequence
count is even.

That "wait for sequence count to stabilize" is the right thing to do if
the read-locker will just retry the whole operation on contention: no
point in doing a potentially expensive reader sequence if we know at the
beginning that we'll just end up re-doing it all.

HOWEVER.  Some users don't actually retry the operation, but instead
will abort and do the operation with proper locking.  So the sequence
count case may be the optimistic quick case, but in the presense of
writers you may want to do full locking in order to guarantee forward
progress.  The prime example of this would be the RCU name lookup.

And in that case, you may well be better off without the "retry early",
and are in a rush to instead get to the failure handling.  Thus this
"raw" interface that just returns the sequence number without testing it
- it just forces the low bit to zero so that read_seqcount_retry() will
always fail such a "active concurrent writer" scenario.
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We really need to use a ACCESS_ONCE() on the sequence value read in
__read_seqcount_begin(), because otherwise the compiler might end up
reloading the value in between the test and the return of it.  As a
result, it might end up returning an odd value (which means that a write
is in progress).

If the reader is then fast enough that that odd value is still the
current one when the read_seqcount_retry() is done, we might end up with
a "successful" read sequence, even despite the concurrent write being
active.

In practice this probably never really happens - there just isn't
anything else going on around the read of the sequence count, and the
common case is that we end up having a read barrier immediately
afterwards.

So the code sequence in which gcc might decide to reaload from memory is
small, and there's no reason to believe it would ever actually do the
reload.  But if the compiler ever were to decide to do so, it would be
incredibly annoying to debug.  Let's just make sure.

Cc: stable@kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This code removes platform dependency from s3c-hsotg driver.
Signed-off-by: NLukasz Majewski <l.majewski@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This new driver registers the NXP ISP1301 chip via the I2C subsystem.  The chip
is the USB transceiver shared by ohci-nxp, lpc32xx_udc (gadget) and
isp1301_omap.

ISP1301 is a very low-level driver that primarily separates out the I2C client
registration of the ISP1301 chip (including instantiation via DT), used by
other drivers, and declares the chip's registers. It's only a helper driver for
some OHCI and USB device drivers.  The driver can be considered as a register
set extension of ohci-nxp, lpc32xx-udc and isp1301_omap, which in turn know
best what to do with the low level functionality (individual ISP1301 registers
and timing, see the different initialization strategies in those drivers).
Those drivers previously internally duplicated ISP1301 register definitions
which is solved by this new isp1301 driver. The ISP1301 registers exposed via
isp1301.h can be accessed by other drivers using it with standard i2c_smbus_*()
accesses.

Following patches let the respective USB host and gadget drivers use this
driver, instead of duplicating ISP1301 handling.
Signed-off-by: NRoland Stigge <stigge@antcom.de>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

On some HCDs usb_unlink_urb() can directly call the
completion handler. That limits the spinlocks that can
be taken in the handler to locks not held while calling
usb_unlink_urb()
To prevent a race with resubmission, this patch exposes
usbcore's infrastructure for blocking submission, uses it
and so drops the lock without causing a race in usbhid.
Signed-off-by: NOliver Neukum <oneukum@suse.de>
Acked-by: NJiri Kosina <jkosina@suse.cz>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

fix kernel doc typos in function names
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

More recent versions of the UEFI spec have added new attributes for
variables. Add them.
Signed-off-by: NMatthew Garrett <mjg@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

<asm-generic/statfs.h> is exported to userspace, so using
BITS_PER_LONG is invalid.  We need to use __BITS_PER_LONG instead.

This is kernel bugzilla 43165.
Reported-by: NH.J. Lu <hjl.tools@gmail.com>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1335465916-16965-1-git-send-email-hpa@linux.intel.comAcked-by: NArnd Bergmann <arnd@arndb.de>
Cc: <stable@vger.kernel.org>

Denys Fedoryshchenko reported frequent crashes on a proxy server and kindly
provided a lockdep report that explains it all :

  [  762.903868]
  [  762.903880] =================================
  [  762.903890] [ INFO: inconsistent lock state ]
  [  762.903903] 3.3.4-build-0061 #8 Not tainted
  [  762.904133] ---------------------------------
  [  762.904344] inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
  [  762.904542] squid/1603 [HC0[0]:SC0[0]:HE1:SE1] takes:
  [  762.904542]  (key#3){+.?...}, at: [<c0232cc4>]
__percpu_counter_sum+0xd/0x58
  [  762.904542] {IN-SOFTIRQ-W} state was registered at:
  [  762.904542]   [<c0158b84>] __lock_acquire+0x284/0xc26
  [  762.904542]   [<c01598e8>] lock_acquire+0x71/0x85
  [  762.904542]   [<c0349765>] _raw_spin_lock+0x33/0x40
  [  762.904542]   [<c0232c93>] __percpu_counter_add+0x58/0x7c
  [  762.904542]   [<c02cfde1>] sk_clone_lock+0x1e5/0x200
  [  762.904542]   [<c0303ee4>] inet_csk_clone_lock+0xe/0x78
  [  762.904542]   [<c0315778>] tcp_create_openreq_child+0x1b/0x404
  [  762.904542]   [<c031339c>] tcp_v4_syn_recv_sock+0x32/0x1c1
  [  762.904542]   [<c031615a>] tcp_check_req+0x1fd/0x2d7
  [  762.904542]   [<c0313f77>] tcp_v4_do_rcv+0xab/0x194
  [  762.904542]   [<c03153bb>] tcp_v4_rcv+0x3b3/0x5cc
  [  762.904542]   [<c02fc0c4>] ip_local_deliver_finish+0x13a/0x1e9
  [  762.904542]   [<c02fc539>] NF_HOOK.clone.11+0x46/0x4d
  [  762.904542]   [<c02fc652>] ip_local_deliver+0x41/0x45
  [  762.904542]   [<c02fc4d1>] ip_rcv_finish+0x31a/0x33c
  [  762.904542]   [<c02fc539>] NF_HOOK.clone.11+0x46/0x4d
  [  762.904542]   [<c02fc857>] ip_rcv+0x201/0x23e
  [  762.904542]   [<c02daa3a>] __netif_receive_skb+0x319/0x368
  [  762.904542]   [<c02dac07>] netif_receive_skb+0x4e/0x7d
  [  762.904542]   [<c02dacf6>] napi_skb_finish+0x1e/0x34
  [  762.904542]   [<c02db122>] napi_gro_receive+0x20/0x24
  [  762.904542]   [<f85d1743>] e1000_receive_skb+0x3f/0x45 [e1000e]
  [  762.904542]   [<f85d3464>] e1000_clean_rx_irq+0x1f9/0x284 [e1000e]
  [  762.904542]   [<f85d3926>] e1000_clean+0x62/0x1f4 [e1000e]
  [  762.904542]   [<c02db228>] net_rx_action+0x90/0x160
  [  762.904542]   [<c012a445>] __do_softirq+0x7b/0x118
  [  762.904542] irq event stamp: 156915469
  [  762.904542] hardirqs last  enabled at (156915469): [<c019b4f4>]
__slab_alloc.clone.58.clone.63+0xc4/0x2de
  [  762.904542] hardirqs last disabled at (156915468): [<c019b452>]
__slab_alloc.clone.58.clone.63+0x22/0x2de
  [  762.904542] softirqs last  enabled at (156915466): [<c02ce677>]
lock_sock_nested+0x64/0x6c
  [  762.904542] softirqs last disabled at (156915464): [<c0349914>]
_raw_spin_lock_bh+0xe/0x45
  [  762.904542]
  [  762.904542] other info that might help us debug this:
  [  762.904542]  Possible unsafe locking scenario:
  [  762.904542]
  [  762.904542]        CPU0
  [  762.904542]        ----
  [  762.904542]   lock(key#3);
  [  762.904542]   <Interrupt>
  [  762.904542]     lock(key#3);
  [  762.904542]
  [  762.904542]  *** DEADLOCK ***
  [  762.904542]
  [  762.904542] 1 lock held by squid/1603:
  [  762.904542]  #0:  (sk_lock-AF_INET){+.+.+.}, at: [<c03055c0>]
lock_sock+0xa/0xc
  [  762.904542]
  [  762.904542] stack backtrace:
  [  762.904542] Pid: 1603, comm: squid Not tainted 3.3.4-build-0061 #8
  [  762.904542] Call Trace:
  [  762.904542]  [<c0347b73>] ? printk+0x18/0x1d
  [  762.904542]  [<c015873a>] valid_state+0x1f6/0x201
  [  762.904542]  [<c0158816>] mark_lock+0xd1/0x1bb
  [  762.904542]  [<c015876b>] ? mark_lock+0x26/0x1bb
  [  762.904542]  [<c015805d>] ? check_usage_forwards+0x77/0x77
  [  762.904542]  [<c0158bf8>] __lock_acquire+0x2f8/0xc26
  [  762.904542]  [<c0159b8e>] ? mark_held_locks+0x5d/0x7b
  [  762.904542]  [<c0159cf6>] ? trace_hardirqs_on+0xb/0xd
  [  762.904542]  [<c0158dd4>] ? __lock_acquire+0x4d4/0xc26
  [  762.904542]  [<c01598e8>] lock_acquire+0x71/0x85
  [  762.904542]  [<c0232cc4>] ? __percpu_counter_sum+0xd/0x58
  [  762.904542]  [<c0349765>] _raw_spin_lock+0x33/0x40
  [  762.904542]  [<c0232cc4>] ? __percpu_counter_sum+0xd/0x58
  [  762.904542]  [<c0232cc4>] __percpu_counter_sum+0xd/0x58
  [  762.904542]  [<c02cebc4>] __sk_mem_schedule+0xdd/0x1c7
  [  762.904542]  [<c02d178d>] ? __alloc_skb+0x76/0x100
  [  762.904542]  [<c0305e8e>] sk_wmem_schedule+0x21/0x2d
  [  762.904542]  [<c0306370>] sk_stream_alloc_skb+0x42/0xaa
  [  762.904542]  [<c0306567>] tcp_sendmsg+0x18f/0x68b
  [  762.904542]  [<c031f3dc>] ? ip_fast_csum+0x30/0x30
  [  762.904542]  [<c0320193>] inet_sendmsg+0x53/0x5a
  [  762.904542]  [<c02cb633>] sock_aio_write+0xd2/0xda
  [  762.904542]  [<c015876b>] ? mark_lock+0x26/0x1bb
  [  762.904542]  [<c01a1017>] do_sync_write+0x9f/0xd9
  [  762.904542]  [<c01a2111>] ? file_free_rcu+0x2f/0x2f
  [  762.904542]  [<c01a17a1>] vfs_write+0x8f/0xab
  [  762.904542]  [<c01a284d>] ? fget_light+0x75/0x7c
  [  762.904542]  [<c01a1900>] sys_write+0x3d/0x5e
  [  762.904542]  [<c0349ec9>] syscall_call+0x7/0xb
  [  762.904542]  [<c0340000>] ? rp_sidt+0x41/0x83

Bug is that sk_sockets_allocated_read_positive() calls
percpu_counter_sum_positive() without BH being disabled.

This bug was added in commit 180d8cd9
(foundations of per-cgroup memory pressure controlling.), since previous
code was using percpu_counter_read_positive() which is IRQ safe.

In __sk_mem_schedule() we dont need the precise count of allocated
sockets and can revert to previous behavior.
Reported-by: NDenys Fedoryshchenko <denys@visp.net.lb>
Sined-off-by: NEric Dumazet <edumazet@google.com>
Cc: Glauber Costa <glommer@parallels.com>
Acked-by: NNeal Cardwell <ncardwell@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Change order of init so netns init is ready
when register ioctl and netlink.

Ver2
	Whitespace fixes and __init added.
Reported-by: N"Ryan O'Hara" <rohara@redhat.com>
Signed-off-by: NHans Schillstrom <hans.schillstrom@ericsson.com>
Acked-by: NJulian Anastasov <ja@ssi.bg>
Signed-off-by: NJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>

ip_vs_create_timeout_table() can return NULL
All functions protocol init_netns is affected of this patch.
Signed-off-by: NHans Schillstrom <hans.schillstrom@ericsson.com>
Acked-by: NJulian Anastasov <ja@ssi.bg>
Signed-off-by: NSimon Horman <horms@verge.net.au>

These are new requests introduced by USB 3.0
Specification. Gadget controllers should implement
them.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This option has been deprecated for many years now, and no userspace
tools use it anymore, so it should be safe to finally remove it.
Reported-by: NKay Sievers <kay@vrfy.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This option has been deprecated for many years now, and no userspace
tools use it anymore, so it should be safe to finally remove it.
Reported-by: NKay Sievers <kay@vrfy.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The actual internal pipe implementation is already really about
individual packets (called "pipe buffers"), and this simply exposes that
as a special packetized mode.

When we are in the packetized mode (marked by O_DIRECT as suggested by
Alan Cox), a write() on a pipe will not merge the new data with previous
writes, so each write will get a pipe buffer of its own.  The pipe
buffer is then marked with the PIPE_BUF_FLAG_PACKET flag, which in turn
will tell the reader side to break the read at that boundary (and throw
away any partial packet contents that do not fit in the read buffer).

End result: as long as you do writes less than PIPE_BUF in size (so that
the pipe doesn't have to split them up), you can now treat the pipe as a
packet interface, where each read() system call will read one packet at
a time.  You can just use a sufficiently big read buffer (PIPE_BUF is
sufficient, since bigger than that doesn't guarantee atomicity anyway),
and the return value of the read() will naturally give you the size of
the packet.

NOTE! We do not support zero-sized packets, and zero-sized reads and
writes to a pipe continue to be no-ops.  Also note that big packets will
currently be split at write time, but that the size at which that
happens is not really specified (except that it's bigger than PIPE_BUF).
Currently that limit is the system page size, but we might want to
explicitly support bigger packets some day.

The main user for this is going to be the autofs packet interface,
allowing us to stop having to care so deeply about exact packet sizes
(which have had bugs with 32/64-bit compatibility modes).  But user
space can create packetized pipes with "pipe2(fd, O_DIRECT)", which will
fail with an EINVAL on kernels that do not support this interface.
Tested-by: NMichael Tokarev <mjt@tls.msk.ru>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: David Miller <davem@davemloft.net>
Cc: Ian Kent <raven@themaw.net>
Cc: Thomas Meyer <thomas@m3y3r.de>
Cc: stable@kernel.org  # needed for systemd/autofs interaction fix
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fix kernel-doc warning in spi.h (copy/paste):

Warning(include/linux/spi/spi.h:365): No description found for parameter 'unprepare_transfer_hardware'
Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

In 3.3, gpio wakeup setting was broken. The call
enable_irq_wake() didn't set up the PXA gpio registers
(PWER, ...) anymore.

Fix it at least for pxa27x. The driver doesn't seem to be
used in pxa25x (weird ...), and the fix doesn't extend to
pxa3xx and pxa95x (which don't have a gpio_set_wake()
available).
Signed-off-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NHaojian Zhuang <haojian.zhuang@gmail.com>

The "pgsteal" stat is confusing because it counts both direct reclaim as
well as background reclaim.  However, we have "kswapd_steal" which also
counts background reclaim value.

This patch fixes it and also makes it match the existng "pgscan_" stats.

Test:
pgsteal_kswapd_dma32 447623
pgsteal_kswapd_normal 42272677
pgsteal_kswapd_movable 0
pgsteal_direct_dma32 2801
pgsteal_direct_normal 44353270
pgsteal_direct_movable 0
Signed-off-by: NYing Han <yinghan@google.com>
Reviewed-by: NRik van Riel <riel@redhat.com>
Acked-by: NChristoph Lameter <cl@linux.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Mel Gorman <mel@csn.ul.ie>
Acked-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Reviewed-by: NMinchan Kim <minchan@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

I thought this had been removed years ago.  All in-kernel users of this
call have now been cleaned up and converted over to use dev_err()
instead, which is the correct thing to do.  Now that there are no users,
the macro can be removed so no one else accidentally starts to use it.
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This patch (as1545) fixes a problem affecting several ASUS computers:
The machine crashes or corrupts memory when going into suspend if the
ehci-hcd driver is bound to any controllers.  Users have been forced
to unbind or unload ehci-hcd before putting their systems to sleep.

After extensive testing, it was determined that the machines don't
like going into suspend when any EHCI controllers are in the PCI D3
power state.  Presumably this is a firmware bug, but there's nothing
we can do about it except to avoid putting the controllers in D3
during system sleep.

The patch adds a new flag to indicate whether the problem is present,
and avoids changing the controller's power state if the flag is set.
Runtime suspend is unaffected; this matters only for system suspend.
However as a side effect, the controller will not respond to remote
wakeup requests while the system is asleep.  Hence USB wakeup is not
functional -- but of course, this is already true in the current state
of affairs.

This fixes Bugzilla #42728.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Tested-by: NSteven Rostedt <rostedt@goodmis.org>
Tested-by: NAndrey Rahmatullin <wrar@wrar.name>
Tested-by: NOleksij Rempel (fishor) <bug-track@fisher-privat.net>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

bridge: set fake_rtable's dst to NULL to avoid kernel Oops

when bridge is deleted before tap/vif device's delete, kernel may
encounter an oops because of NULL reference to fake_rtable's dst.
Set fake_rtable's dst to NULL before sending packets out can solve
this problem.

v4 reformat, change br_drop_fake_rtable(skb) to {}

v3 enrich commit header

v2 introducing new flag DST_FAKE_RTABLE to dst_entry struct.

[ Use "do { } while (0)" for nop br_drop_fake_rtable()
  implementation -DaveM ]
Acked-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NPeter Huang <peter.huangpeng@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

For the particular issue of x32, which shares code with i386 in the
handling of compat_siginfo_t, the use of a 64-bit clock_t bumps the
sigchld structure out of alignment, which triggers a messy cascade of
padding.

This was already handled on the kernel compat side, but it needs
handling on the user space side, which uses the generic header.  To
make that possible:

1. Allow __kernel_clock_t to be overridden in struct siginfo;
2. Allow there to be attributes added to struct siginfo.
Reported-by: NH.J. Lu <hjl.rools@gmail.com>
Cc: Bruce J. Beare <bruce.j.beare@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: http://lkml.kernel.org/r/CAMe9rOqF6Kh6-NK7oP0Fpzkd4SBAWU%2BG53hwBbSD4iA2UzyxuA@mail.gmail.comSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Remove custom hack and make use of the notifier chain interfaces for
delivering events from the ports to their associated clients.
Clients that want to receive port events need to register their callbacks
using hsi_register_port_event(). The callbacks can be called in interrupt
context. Use hsi_unregestier_port_event() to undo the registration.
Signed-off-by: NCarlos Chinea <carlos.chinea@nokia.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>

Use the proper release mechanism for hsi_controller and
hsi_ports structures. Free the structures through their
associated device release callbacks.
Signed-off-by: NCarlos Chinea <carlos.chinea@nokia.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>

This changes the ordering of initialization and probing events from:
  1/ allocate rphy in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  2/ allocate ata_port and schedule port probe in DISCE_PROBE
...to:
  1/ allocate ata_port in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  2/ allocate rphy in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  3/ schedule port probe in DISCE_PROBE

This ordering prevents PHYE_SIGNAL_LOSS_EVENTS from sneaking in to
destrory ata devices before they have been fully initialized:

  BUG: unable to handle kernel paging request at 0000000000003b10
  IP: [<ffffffffa0053d7e>] sas_ata_end_eh+0x12/0x5e [libsas]
  ...
  [<ffffffffa004d1af>] sas_unregister_common_dev+0x78/0xc9 [libsas]
  [<ffffffffa004d4d4>] sas_unregister_dev+0x4f/0xad [libsas]
  [<ffffffffa004d5b1>] sas_unregister_domain_devices+0x7f/0xbf [libsas]
  [<ffffffffa004c487>] sas_deform_port+0x61/0x1b8 [libsas]
  [<ffffffffa004bed0>] sas_phye_loss_of_signal+0x29/0x2b [libsas]

...and kills the awkward "sata domain_device briefly existing in the
domain without an ata_port" state.
Reported-by: NMichal Kosciowski <michal.kosciowski@intel.com>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
Acked-by: NJeff Garzik <jgarzik@redhat.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

When requeuing work to a draining workqueue the last work instance may
not be idle, so sas_queue_work() must not touch work->entry.  Introduce
sas_work with a drain_node list_head to have a private list for
collecting work deferred due to drain collision.

Fixes reports like:
  BUG: unable to handle kernel NULL pointer dereference at           (null)
  IP: [<ffffffff810410d4>] process_one_work+0x2e/0x338
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

This is meant typically to allow a PIC driver's irq domain map() callback
to establish sane defaults for the interrupt (and make sure that the HW
and the irq_desc are in sync as far as the trigger is concerned).

The irq core may not call the set_trigger callback if it thinks the
trigger is already set to the right setting, so we need to ensure new
descriptors are properly synchronized with the hardware.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

it's always current->mm
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>