Finishing import of Qualcomm ROW I/O Scheduler.
update ROW from CAF
block: updates from CAF for ROW support
block: row: Add some debug information on ROW queues

1. Add a counter for number of requests on queue.
2. Add function to print queues status (number requests
   currently on queue and number of already dispatched requests
   in current dispatch cycle).

Change-Id: I1e98b9ca33853e6e6a8ddc53240f6cd6981e6024
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
block: row: Insert dispatch_quantum into struct row_queue

There is really no point in keeping the dispatch quantum
of a queue outside of it. By inserting it to the row_queue
structure we spare extra level in accessing it.

Change-Id: Ic77571818b643e71f9aafbb2ca93d0a92158b199
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
block: row: fix sysfs functions - idle_time conversion

idle_time was updated to be stored in msec instead of jiffies.
So there is no need to convert the value when reading from user or
displaying the value to him.

Change-Id: I58e074b204e90a90536d32199ac668112966e9cf
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
block: row: Aggregate row_queue parameters to one structure

Each ROW queues has several parameters which default values are defined
in separate arrays. This patch aggregates all default values into one
array.
The values in question are:
 - is idling enabled for the queue
 - queue quantum
 - can the queue notify on urgent request

Change-Id: I3821b0a042542295069b340406a16b1000873ec6
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
block: row: Dispatch requests according to their io-priority

This patch implements "application-hints" which is a way the issuing
application can notify the scheduler on the priority of its request.
This is done by setting the io-priority of the request.
This patch reuses an already existing mechanism of io-priorities developed
for CFQ. Please refer to kernel/Documentation/block/ioprio.txt for
usage example and explanations.

Change-Id: I228ec8e52161b424242bb7bb133418dc8b73925a
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
block: row: Idling mechanism re-factoring

At the moment idling in ROW is implemented by delayed work that uses
jiffies granularity which is not very accurate. This patch replaces
current idling mechanism implementation with hrtime API, which gives
nanosecond resolution (instead of jiffies).

Change-Id: I86c7b1776d035e1d81571894b300228c8b8f2d92
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
signal: Define __ARCH_HAS_SA_RESTORER so we know whether to clear sa_restorer

Vaguely based on upstream commit 574c4866e33d 'consolidate kernel-side
struct sigaction declarations'.

flush_signal_handlers() needs to know whether sigaction::sa_restorer
is defined, not whether SA_RESTORER is defined.  Define the
__ARCH_HAS_SA_RESTORER macro to indicate this.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
kernel/signal.c: use __ARCH_HAS_SA_RESTORER instead of SA_RESTORER

commit 522cff142d7d2f9230839c9e1f21a4d8bcc22a4a upstream.

__ARCH_HAS_SA_RESTORER is the preferred conditional for use in 3.9 and
later kernels, per Kees.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Emese Revfy <re.emese@gmail.com>
Cc: Emese Revfy <re.emese@gmail.com>
Cc: PaX Team <pageexec@freemail.hu>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Julien Tinnes <jln@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
SUNRPC: Add barriers to ensure read ordering in rpc_wake_up_task_queue_locked

commit 1166fde6a923c30f4351515b6a9a1efc513e7d00 upstream.

We need to be careful when testing task->tk_waitqueue in
rpc_wake_up_task_queue_locked, because it can be changed while we
are holding the queue->lock.
By adding appropriate memory barriers, we can ensure that it is safe to
test task->tk_waitqueue for equality if the RPC_TASK_QUEUED bit is set.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
tile: expect new initramfs name from hypervisor file system

commit ff7f3efb9abf986f4ecd8793a9593f7ca4d6431a upstream.

The current Tilera boot infrastructure now provides the initramfs
to Linux as a Tilera-hypervisor file named "initramfs", rather than
"initramfs.cpio.gz", as before.  (This makes it reasonable to use
other compression techniques than gzip on the file without having to
worry about the name causing confusion.)  Adapt to use the new name,
but also fall back to checking for the old name.

Cc'ing to stable so that older kernels will remain compatible with
newer Tilera boot infrastructure.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Bluetooth: Fix not closing SCO sockets in the BT_CONNECT2 state

commit eb20ff9c91ddcb2d55c1849a87d3db85af5e88a9 upstream.

With deferred setup for SCO, it is possible that userspace closes the
socket when it is in the BT_CONNECT2 state, after the Connect Request is
received but before the Accept Synchonous Connection is sent.

If this happens the following crash was observed, when the connection is
terminated:

[  +0.000003] hci_sync_conn_complete_evt: hci0 status 0x10
[  +0.000005] sco_connect_cfm: hcon ffff88003d1bd800 bdaddr 40:98:4e:32:d7:39 status 16
[  +0.000003] sco_conn_del: hcon ffff88003d1bd800 conn ffff88003cc8e300, err 110
[  +0.000015] BUG: unable to handle kernel NULL pointer dereference at 0000000000000199
[  +0.000906] IP: [<ffffffff810620dd>] __lock_acquire+0xed/0xe82
[  +0.000000] PGD 3d21f067 PUD 3d291067 PMD 0
[  +0.000000] Oops: 0002 [#1] SMP
[  +0.000000] Modules linked in: rfcomm bnep btusb bluetooth
[  +0.000000] CPU 0
[  +0.000000] Pid: 1481, comm: kworker/u:2H Not tainted 3.9.0-rc1-25019-gad82cdd #1 Bochs Bochs
[  +0.000000] RIP: 0010:[<ffffffff810620dd>]  [<ffffffff810620dd>] __lock_acquire+0xed/0xe82
[  +0.000000] RSP: 0018:ffff88003c3c19d8  EFLAGS: 00010002
[  +0.000000] RAX: 0000000000000001 RBX: 0000000000000246 RCX: 0000000000000000
[  +0.000000] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88003d1be868
[  +0.000000] RBP: ffff88003c3c1a98 R08: 0000000000000002 R09: 0000000000000000
[  +0.000000] R10: ffff88003d1be868 R11: ffff88003e20b000 R12: 0000000000000002
[  +0.000000] R13: ffff88003aaa8000 R14: 000000000000006e R15: ffff88003d1be850
[  +0.000000] FS:  0000000000000000(0000) GS:ffff88003e200000(0000) knlGS:0000000000000000
[  +0.000000] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  +0.000000] CR2: 0000000000000199 CR3: 000000003c1cb000 CR4: 00000000000006b0
[  +0.000000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  +0.000000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  +0.000000] Process kworker/u:2H (pid: 1481, threadinfo ffff88003c3c0000, task ffff88003aaa8000)
[  +0.000000] Stack:
[  +0.000000]  ffffffff81b16342 0000000000000000 0000000000000000 ffff88003d1be868
[  +0.000000]  ffffffff00000000 00018c0c7863e367 000000003c3c1a28 ffffffff8101efbd
[  +0.000000]  0000000000000000 ffff88003e3d2400 ffff88003c3c1a38 ffffffff81007c7a
[  +0.000000] Call Trace:
[  +0.000000]  [<ffffffff8101efbd>] ? kvm_clock_read+0x34/0x3b
[  +0.000000]  [<ffffffff81007c7a>] ? paravirt_sched_clock+0x9/0xd
[  +0.000000]  [<ffffffff81007fd4>] ? sched_clock+0x9/0xb
[  +0.000000]  [<ffffffff8104fd7a>] ? sched_clock_local+0x12/0x75
[  +0.000000]  [<ffffffff810632d1>] lock_acquire+0x93/0xb1
[  +0.000000]  [<ffffffffa0022339>] ? spin_lock+0x9/0xb [bluetooth]
[  +0.000000]  [<ffffffff8105f3d8>] ? lock_release_holdtime.part.22+0x4e/0x55
[  +0.000000]  [<ffffffff814f6038>] _raw_spin_lock+0x40/0x74
[  +0.000000]  [<ffffffffa0022339>] ? spin_lock+0x9/0xb [bluetooth]
[  +0.000000]  [<ffffffff814f6936>] ? _raw_spin_unlock+0x23/0x36
[  +0.000000]  [<ffffffffa0022339>] spin_lock+0x9/0xb [bluetooth]
[  +0.000000]  [<ffffffffa00230cc>] sco_conn_del+0x76/0xbb [bluetooth]
[  +0.000000]  [<ffffffffa002391d>] sco_connect_cfm+0x2da/0x2e9 [bluetooth]
[  +0.000000]  [<ffffffffa000862a>] hci_proto_connect_cfm+0x38/0x65 [bluetooth]
[  +0.000000]  [<ffffffffa0008d30>] hci_sync_conn_complete_evt.isra.79+0x11a/0x13e [bluetooth]
[  +0.000000]  [<ffffffffa000cd96>] hci_event_packet+0x153b/0x239d [bluetooth]
[  +0.000000]  [<ffffffff814f68ff>] ? _raw_spin_unlock_irqrestore+0x48/0x5c
[  +0.000000]  [<ffffffffa00025f6>] hci_rx_work+0xf3/0x2e3 [bluetooth]
[  +0.000000]  [<ffffffff8103efed>] process_one_work+0x1dc/0x30b
[  +0.000000]  [<ffffffff8103ef83>] ? process_one_work+0x172/0x30b
[  +0.000000]  [<ffffffff8103e07f>] ? spin_lock_irq+0x9/0xb
[  +0.000000]  [<ffffffff8103fc8d>] worker_thread+0x123/0x1d2
[  +0.000000]  [<ffffffff8103fb6a>] ? manage_workers+0x240/0x240
[  +0.000000]  [<ffffffff81044211>] kthread+0x9d/0xa5
[  +0.000000]  [<ffffffff81044174>] ? __kthread_parkme+0x60/0x60
[  +0.000000]  [<ffffffff814f75bc>] ret_from_fork+0x7c/0xb0
[  +0.000000]  [<ffffffff81044174>] ? __kthread_parkme+0x60/0x60
[  +0.000000] Code: d7 44 89 8d 50 ff ff ff 4c 89 95 58 ff ff ff e8 44 fc ff ff 44 8b 8d 50 ff ff ff 48 85 c0 4c 8b 95 58 ff ff ff 0f 84 7a 04 00 00 <f0> ff 80 98 01 00 00 83 3d 25 41 a7 00 00 45 8b b5 e8 05 00 00
[  +0.000000] RIP  [<ffffffff810620dd>] __lock_acquire+0xed/0xe82
[  +0.000000]  RSP <ffff88003c3c19d8>
[  +0.000000] CR2: 0000000000000199
[  +0.000000] ---[ end trace e73cd3b52352dd34 ]---

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Tested-by: Frederic Dalleau <frederic.dalleau@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Bluetooth: Add support for Dell[QCA 0cf3:817a]

commit ebaf5795ef57a70a042ea259448a465024e2821d upstream.

Add support for the AR9462 chip

T:  Bus=03 Lev=01 Prnt=01 Port=08 Cnt=01 Dev#=  5 Spd=12   MxCh= 0
D:  Ver= 1.10 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=0cf3 ProdID=817a Rev= 0.02
C:* #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=81(I) Atr=03(Int.) MxPS=  16 Ivl=1ms
E:  Ad=82(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=   0 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=   0 Ivl=1ms
I:  If#= 1 Alt= 1 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=   9 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=   9 Ivl=1ms
I:  If#= 1 Alt= 2 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  17 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  17 Ivl=1ms
I:  If#= 1 Alt= 3 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  25 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  25 Ivl=1ms
I:  If#= 1 Alt= 4 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  33 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  33 Ivl=1ms
I:  If#= 1 Alt= 5 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  49 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  49 Ivl=1ms

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
staging: comedi: s626: fix continuous acquisition

commit e4317ce877a31dbb9d96375391c1c4ad2210d637 upstream.

For the s626 driver, there is a bug in the handling of asynchronous
commands on the AI subdevice when the stop source is `TRIG_NONE`.  The
command should run continuously until cancelled, but the interrupt
handler stops the command running after the first scan.

The command set-up function `s626_ai_cmd()` contains this code:

	switch (cmd->stop_src) {
	case TRIG_COUNT:
		/*  data arrives as one packet */
		devpriv->ai_sample_count = cmd->stop_arg;
		devpriv->ai_continous = 0;
		break;
	case TRIG_NONE:
		/*  continous acquisition */
		devpriv->ai_continous = 1;
		devpriv->ai_sample_count = 0;
		break;
	}

The interrupt handler `s626_irq_handler()` contains this code:

		if (!(devpriv->ai_continous))
			devpriv->ai_sample_count--;
		if (devpriv->ai_sample_count <= 0) {
			devpriv->ai_cmd_running = 0;
			/* ... */
		}

So `devpriv->ai_sample_count` is only decremented for the `TRIG_COUNT`
case, but `devpriv->ai_cmd_running` is set to 0 (and the command
stopped) regardless.

Fix this in `s626_ai_cmd()` by setting `devpriv->ai_sample_count = 1`
for the `TRIG_NONE` case.  The interrupt handler will not decrement it
so it will remain greater than 0 and the check for stopping the
acquisition will fail.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
sysfs: fix race between readdir and lseek

commit 991f76f837bf22c5bb07261cfd86525a0a96650c upstream.

While readdir() is running, lseek() may set filp->f_pos as zero,
then may leave filp->private_data pointing to one sysfs_dirent
object without holding its reference counter, so the sysfs_dirent
object may be used after free in next readdir().

This patch holds inode->i_mutex to avoid the problem since
the lock is always held in readdir path.

Reported-by: Dave Jones <davej@redhat.com>
Tested-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
sysfs: handle failure path correctly for readdir()

commit e5110f411d2ee35bf8d202ccca2e89c633060dca upstream.

In case of 'if (filp->f_pos ==  0 or 1)' of sysfs_readdir(),
the failure from filldir() isn't handled, and the reference counter
of the sysfs_dirent object pointed by filp->private_data will be
released without clearing filp->private_data, so use after free
bug will be triggered later.

This patch returns immeadiately under the situation for fixing the bug,
and it is reasonable to return from readdir() when filldir() fails.

Reported-by: Dave Jones <davej@redhat.com>
Tested-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
can: sja1000: fix define conflict on SH

commit f901b6bc404b67d96eca739857c097e022727b71 upstream.

Thias patch fixes a define conflict between the SH architecture and the sja1000
driver:

    drivers/net/can/sja1000/sja1000.h:59:0: warning:
        "REG_SR" redefined [enabled by default]
    arch/sh/include/asm/ptrace_32.h:25:0: note:
         this is the location of the previous definition

A SJA1000_ prefix is added to the offending sja1000 define only, to make a
minimal patch suited for stable. A later patch will add a SJA1000_ prefix to
all defines in sja1000.h.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
ath9k_hw: revert chainmask to user configuration after calibration

commit 74632d11a133b5baf6b9d622dd19d2f944d93d94 upstream.

The commit 'ath9k_hw: fix calibration issues on chainmask that don't
include chain 0' changed the hardware chainmask to the chip chainmask
for the duration of the calibration, but the revert to user
configuration in the reset path runs too early.

That causes some issues with limiting the number of antennas (including
spurious failure in hardware-generated packets).

Fix this by reverting the chainmask after the essential parts of the
calibration that need the workaround, and before NF calibration is run.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Reported-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com>
Tested-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>