Commit graph

56,933 commits

Author SHA1 Message Date
Peter Ujfalusi
ab7edb149c mfd: twl6040: Convert to use regmap_irq
With regmap_irq it is possible to remove the twl6040-irq.c file and
simplify the code.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-11-13 19:54:23 +01:00
Greg Kroah-Hartman
9f488ba863 IIO: fix build error in lp8788-charger.c
Turns out that consumer.h needs to include types.h on some platforms to
build properly (like powerpc).

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-13 10:46:33 -08:00
Greg Kroah-Hartman
b240add62c Merge 3.7-rc5 into usb-next
This pulls in the 3.7-rc5 branch into usb-next
2012-11-13 10:33:29 -08:00
Matt Fleming
89d16665d3 efivarfs: Use query_variable_info() to limit kmalloc()
We don't want someone who can write EFI variables to be able to
allocate arbitrarily large amounts of memory, so cap it to something
sensible like the amount of free space for EFI variables.

Acked-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2012-11-13 12:33:21 +00:00
Arnd Bergmann
b5932cc839 Merge branch 'cleanups/dma' into next/cleanup
Separate patches from Marek Szyprowski <m.szyprowski@samsung.com>:

Commit e9da6e9905 ("ARM: dma-mapping: remove custom consistent dma
region") replaced custom consistent memory handling, so setting
consistent dma memory size is not longer required. This patch series
cleans sub-architecture platform code to remove all calls to the
obsolated init_consistent_dma_size() function and finally removes the
init_consistent_dma_size() stub itself.

* cleanups/dma:
  ARM: at91: remove obsoleted init_consistent_dma_size()
  ARM: u300: remove obsoleted init_consistent_dma_size()
  ARM: dma-mapping: remove init_consistent_dma_size() stub
  ARM: shmobile: remove obsoleted init_consistent_dma_size()
  ARM: davinci: remove obsoleted init_consistent_dma_size()
  ARM: samsung: remove obsoleted init_consistent_dma_size()

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2012-11-13 10:14:38 +01:00
Steffen Klassert
703fb94ec5 xfrm: Fix the gc threshold value for ipv4
The xfrm gc threshold value depends on ip_rt_max_size. This
value was set to INT_MAX with the routing cache removal patch,
so we start doing garbage collecting when we have INT_MAX/2
IPsec routes cached. Fix this by going back to the static
threshold of 1024 routes.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2012-11-13 09:15:07 +01:00
Arnd Bergmann
8a6ff8a0a2 arm: at91: mach header cleanup
This first patch serie start the cleanup of the header in mach
 by moving all the platform data to include/linux/platform_data
 
 and move the board header and drivers header next to them
 
 Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
 Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.12 (GNU/Linux)
 
 iQIcBAABAgAGBQJQmQMyAAoJEOrjwV5ZMRf2N8kP/1J2DI26zhNWGIdiTPFX/HXG
 o03lvElDKDDyNtC87gU2DnYkOdjFVRpagZxv089whDs4Lt22A8ClaxEFca9K1oPg
 XO0NtuHbTL3wGlPLJH4C90bpQWY4FyIQLMfPaMeifrP1OpRkeSWAYKfFUB/wOtRC
 KWNl+WmpBt9JN9H1RIezYxpRteC+wUBKpYVZkRdT3OkQ4/oMqDIWzZqkMCTKy+Bb
 Ucs9ZFqkJ/5fSGYjHLG34VpbepFKgCqeDVugz2v+7SHvIkl0/XbRhGOdxJek54GD
 0OW8Gg5Utw47YQ1uYDR3IM00cod41/l9NYMKZm/DIEUdvNP3Mp+/X0Knehov+O+7
 7Xs8eSzBHE0mRAx2as71av08PNptNVAcJh/UAO8PWE5yLGivGrp8kQWzJItnl2ma
 8GmIK26bmMAqGuR+wANrT/pCCW5kxALE8L1JnCMzjhv5TvKE88mjUZuVmNnZGCdY
 SE/hotD2c2asZ15zv52wrGGpOALW6ZaQdlRafuDli1/yHeJ1uPOWec7NKnzytDpL
 A0r22RDyvqR7N2hunFu2aO757ojAsIWS8qfF2Yztr0UaE6rC+aoYKBwTfzvC5yhh
 gaurkH8jCUJ9EHw+GBs1pZQK9wWaK7MrlNj7/mVZ1iXErWCHZYcYNbxlx/xAFzUv
 IoHsmg6lL5By3p3nvElG
 =c5hx
 -----END PGP SIGNATURE-----

Merge tag 'for-3.8-at91_header_clean' of git://github.com/at91linux/linux-at91 into next/headers

From Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>:
arm: at91: mach header cleanup

This first patch serie start the cleanup of the header in mach
by moving all the platform data to include/linux/platform_data

and move the board header and drivers header next to them

* tag 'for-3.8-at91_header_clean' of git://github.com/at91linux/linux-at91:
  arm: at91: move at91rm9200 rtc header in drivers/rtc
  arm: at91: move reset controller header to arm/arm/mach-at91
  arm: at91: move pit define to the driver
  arm: at91: move at91_shdwc.h to arch/arm/mach-at91
  arm: at91: move board header to arch/arm/mach-at91
  arn: at91: move at91_tc.h to arch/arm/mach-at91
  arm: at91 move at91_aic.h to arch/arm/mach-at91
  arm: at91 move board.h to arch/arm/mach-at91
  arm: at91: move platfarm_data to include/linux/platform_data/atmel.h
  arm: at91: drop machine defconfig

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2012-11-12 22:54:08 +01:00
Arnd Bergmann
94c78a55b8 Merge branches 'depends/asoc', 'renesas/boards', 'renesas/soc' and 'renesas/soc2' into next/boards2
These are all dependencies for the next set of renesas shmobile board
changes.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2012-11-12 21:59:00 +01:00
Arnd Bergmann
fd2e1dd7bb Merge branches 'depends/asoc', 'renesas/boards' and 'renesas/soc' into next/boards2
These are all dependencies for the renesas/boards2 branch.

Conflicts:
	arch/arm/configs/marzen_defconfig
2012-11-12 21:57:52 +01:00
Arnd Bergmann
1bf0bc1e05 Merge branch 'soc' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into next/soc
From Simon Horman <horms@verge.net.au>:
  This series is based on the renesas/soc branch of the arm-soc tree.
  There will be a subquent 'SoC2' pull request which is based on this
  pull-request and a pull-request for boards.

* 'soc' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
  ARM: shmobile: add fsi external clock sh7372
  ARM: shmobile: add fsi external clock on r8a7740
  ARM: shmobile: r8a7740: add FSI-DVI clocks
  ARM: shmobile: sh7372: use sh_clk_fsidiv_register() for FSI-DIV clocks
  ARM: shmobile: sh7372: sh7372_fsidivX_clk become non-global
  sh: clkfwk: add sh_clk_fsidiv_register()
  ARM: shmobile: r8a7779: add USB OHCI clock support
  ARM: shmobile: r8a7779: add USB EHCI clock support
  ARM: shmobile: r8a7740: add USB24 clock explain
  ARM: shmobile: r8a7779: PFC rename PENCx -> USB_PENCx

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2012-11-12 21:45:19 +01:00
Ansis Atteka
9195bb8e38 ipv6: improve ipv6_find_hdr() to skip empty routing headers
This patch prepares ipv6_find_hdr() function so that it could be
able to skip routing headers, where segements_left is 0. This is
required to handle multiple routing header case correctly when
changing IPv6 addresses.

Signed-off-by: Ansis Atteka <aatteka@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
2012-11-12 12:31:37 -08:00
Arnd Bergmann
b68c50d836 Merge branch 'lpc32xx/core' of git://git.antcom.de/linux-2.6 into next/soc
Patches from Roland Stigge <stigge@antcom.de>:

  Platform topic branch for lpc32xx

* 'lpc32xx/core' of git://git.antcom.de/linux-2.6:
  ARM: LPC32xx: Add the motor PWM clock
  ARM: LPC32xx: Cleanup irq.c
  ARM: LPC32xx: Relocate calls to irq_set_chained_handler()
  ARM: LPC32xx: Remove superfluous irq_alloc_descs()

Includes an update to v3.7-rc4

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2012-11-12 15:26:41 +01:00
Sascha Hauer
53640f41b9 Merge remote-tracking branch 'arm-soc/imx/multiplatform' into imx25-dt 2012-11-12 12:08:12 +01:00
Amitkumar Karwar
2a91c9f781 nl/cfg80211: advertise OBSS scan requirement
wpa_supplicant will do OBSS scan for drivers that implement
auth/assoc API. Drivers that implement nl80211 connect API
(rather than auth/assoc) may need wpa_supplicant to do this
as well.

Add a new feature flag to inform it (wpa_s) that a driver
needs wpa_supplicant to do OBSS scans.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2012-11-12 10:30:14 +01:00
Greg Kroah-Hartman
045020e776 4th set of IIO driver updates and new functionality for the 3.8 cycle.
2 drivers going through final cleanup and moving out of staging.
 
 Addition to the core of support for multiple buffers from a single
 datastream.  This functionality is core in allowing multiple users
 of interrupt driven data streams from the devices.  First user
 will shortly be an input bridge driver.  This has been in review
 / revision for over a year resulting in a far cleaner result.
 Much of the work had been in precursor patches. Here we just
 add the buffer set tear up and down support + switch to multiple
 buffer pushing in the drivers (a one line change in all users).
 Thanks to those who have tested / reviewed this set.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.19 (GNU/Linux)
 
 iQIcBAABAgAGBQJQni58AAoJEFSFNJnE9BaIptQP/3HIIs7NTREAtgslPY9bg8cM
 pEjsFIEAbiZqnAtRCwuwXneATWvPhJrLd0AeMKI+47R0GDabDJfjsmLj6hRA6v2I
 cAQ26PQHlHzatCNrH0uDVCmtlkh9yuab+7M6StU5kGn2u+vEULGss85gRlHgqV1I
 vEeBx2byZTGTleQ0qS88k2/XYzKigSvyK8ZYDOxseYvl8Frq5Jf5Nn9J33YImNnq
 +F+Xdrkj74RgfXaf6pTKQKIPFmUlHPGExgrkutw/QhKb11lPx84cz8FKjdhvTSFA
 V8ynGur5KcHMGxenkWlp2aGZ8418zlhyhuw8hEsWEmGoHBPdaujJXejEfH0KoB+k
 piHGSUoduXD8p4FJG3YuwLV5FXvqlSNrvAvCdabcEiJDdm08u8JiUQhJr7jePkdO
 T+mHZBj2D4BXiZuAFDMn2XRScYNrgvCsu1+Wq9srwwtVgDM5ezYaOrmf/1fIxo2m
 i/mvYFn6bOhe7yXyX3eKadBKqIgOoOarPLIaMMzW0NcWy0LPEstfiLZJVxPHljOE
 BXHrc55zhxa20rjzpu3LQRx70B3dbDuKXy12JzL+yysAcu89WtA2NqALo8Lu5zEK
 PZDPm5y/9W69zOQRq0xZP2Twa+zxItyo9fZft/s3jhFb19IUYBqnc5Clcd+XXELh
 zpYJjXt2KhCsZKf07oBZ
 =nWOE
 -----END PGP SIGNATURE-----

Merge tag 'iio-for-3.8d' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

IIO cleanups and fixes from Jonathan:

"4th set of IIO driver updates and new functionality for the 3.8 cycle.

2 drivers going through final cleanup and moving out of staging.

Addition to the core of support for multiple buffers from a single
datastream.  This functionality is core in allowing multiple users
of interrupt driven data streams from the devices.  First user
will shortly be an input bridge driver.  This has been in review
/ revision for over a year resulting in a far cleaner result.
Much of the work had been in precursor patches. Here we just
add the buffer set tear up and down support + switch to multiple
buffer pushing in the drivers (a one line change in all users).
Thanks to those who have tested / reviewed this set."
2012-11-11 18:39:17 -08:00
Greg Kroah-Hartman
f8b0655050 Merge 3.7-rc5 into staging-next 2012-11-11 18:28:26 -08:00
Greg Kroah-Hartman
7fd94beeca usb: gadget: patches for v3.8
renesas_usbhs implements ->pullup() method, switches over
 to devm_request_irq(), adds support for DMA Engine and
 got a few miscelaneous cleanups.
 
 The NCM gadget got an endianness fix and the Ethernet
 gadget a frame size fix.
 
 We're finally removing the g_file_storage gadget and
 sticking to g_mass_storage and the new tcm_usb_gadget
 gadgets since that was a huge duplicaton of effort anyway.
 
 While removing g_file_storage, we also had to fix a bunch
 of defconfigs which were still pointing to the old gadget.
 
 There's a big series getting us closer to being able to
 introduce our configfs interface. The series converts
 functions into loadable modules which will, eventually,
 be registered to the configfs interface.
 
 Other than that there's the usual typo fixes and miscelaneous
 cleanups all over the place.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.12 (GNU/Linux)
 
 iQIcBAABAgAGBQJQnXPMAAoJEIaOsuA1yqREkygQALIuhY6veRPZoZJltuADeAOV
 h7lBkuseJxvlJsbMLnjqP5tw4W/haE1deGR+ee1ZItkPrERCX1++jkQ6hmm7e00R
 mvr8rI+n3eBHSKUO89tUfCaz5UBsTl0cowPWdTwxRrV4VRJ1wVBw/oII9sfyss03
 jDo+11DSjTGTB+Bz72p2NTkRiv9my2Kz+ihhqFR5VSl5FyoutG53RNKRmciJKGB+
 i+RptOI+prdW1uOURHbie5FAI0xOBrE1Up2XdNiZ9blT6zcsK754Lc8erFJEZXX5
 7s8Ys/HJZLQCF/fRt4WAw8e1lSPELD2xuDMqV+WKu93aXOiAWL1SbzqK3Y+PaUDg
 Red07jOxgPqgq0F1mAp3+0Rs1RnshSvKREtQhZqsttg7suXhDB0q7h61CX8uQbRA
 hBZh8eFexRjqOZxveeV+h4ATz00c2nlEa8cJscr5zLf4R/LSxJWT7LV5227BDkBV
 9NUMA3dunDYZLqnxBv5lS2gQzmYO6G11wzdpgjnABL2WlM8Pv1lUDhY+erwvTRzd
 BM+9qMd7K40BuI1JyUsbBdmuEpJAD/yWE77pT2aBrr4767x0CYjBPZqQAxXFcWi8
 5NG1BzqWmH9HhwxKyWueWgNgY253cRcAzFlUN80NRA2UuNkMAeOAeJjvK48isAqJ
 T1MUkQgIFNvSecpRPrEl
 =umtl
 -----END PGP SIGNATURE-----

Merge tag 'gadget-for-v3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next

USB gadget patches from Felipe:
"usb: gadget: patches for v3.8

renesas_usbhs implements ->pullup() method, switches over
to devm_request_irq(), adds support for DMA Engine and
got a few miscelaneous cleanups.

The NCM gadget got an endianness fix and the Ethernet
gadget a frame size fix.

We're finally removing the g_file_storage gadget and
sticking to g_mass_storage and the new tcm_usb_gadget
gadgets since that was a huge duplicaton of effort anyway.

While removing g_file_storage, we also had to fix a bunch
of defconfigs which were still pointing to the old gadget.

There's a big series getting us closer to being able to
introduce our configfs interface. The series converts
functions into loadable modules which will, eventually,
be registered to the configfs interface.

Other than that there's the usual typo fixes and miscelaneous
cleanups all over the place."
2012-11-11 17:31:53 -08:00
Geert Uytterhoeven
90a38d9997 mfd: Remove Unicode Byte Order Marks from da9055
Older gcc (< 4.4) doesn't like files starting with Unicode BOMs:

include/linux/mfd/da9055/core.h:1: error: stray ‘\357’ in program
include/linux/mfd/da9055/core.h:1: error: stray ‘\273’ in program
include/linux/mfd/da9055/core.h:1: error: stray ‘\277’ in program
include/linux/mfd/da9055/pdata.h:1: error: stray ‘\357’ in program
include/linux/mfd/da9055/pdata.h:1: error: stray ‘\273’ in program
include/linux/mfd/da9055/pdata.h:1: error: stray ‘\277’ in program
include/linux/mfd/da9055/reg.h:1: error: stray ‘\357’ in program
include/linux/mfd/da9055/reg.h:1: error: stray ‘\273’ in program
include/linux/mfd/da9055/reg.h:1: error: stray ‘\277’ in program

Remove the BOMs, the rest of the files is plain ASCII anyway.

Output of "file" before:

include/linux/mfd/da9055/core.h:  UTF-8 Unicode (with BOM) C program text
include/linux/mfd/da9055/pdata.h: UTF-8 Unicode (with BOM) C program text
include/linux/mfd/da9055/reg.h:   UTF-8 Unicode (with BOM) C program text

Output of "file" after:

include/linux/mfd/da9055/core.h:  ASCII C program text
include/linux/mfd/da9055/pdata.h: ASCII C program text
include/linux/mfd/da9055/reg.h:   ASCII C program text

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-11-12 00:54:57 +01:00
Ben Widawsky
009946f89b drm/i915: Kill off now unused gen6+ AGP code
v2: Accidently removed an ILK case in i9xx_setup (Nicely found by Chris)

CC: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by [v1] : Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-11-11 23:51:43 +01:00
Ben Widawsky
e76e9aebcd drm/i915: Stop using AGP layer for GEN6+
As a quick hack we make the old intel_gtt structure mutable so we can
fool a bunch of the existing code which depends on elements in that data
structure. We can/should try to remove this in a subsequent patch.

This should preserve the old gtt init behavior which upon writing these
patches seems incorrect. The next patch will fix these things.

The one exception is VLV which doesn't have the preserved flush control
write behavior. Since we want to do that for all GEN6+ stuff, we'll
handle that in a later patch. Mainstream VLV support doesn't actually
exist yet anyway.

v2: Update the comment to remove the "voodoo"
Check that the last pte written matches what we readback

v3: actually kill cache_level_to_agp_type since most of the flags will
disappear in an upcoming patch

v4: v3 was actually not what we wanted (Daniel)
Make the ggtt bind assertions better and stricter (Chris)
Fix some uncaught errors at gtt init (Chris)
Some other random stuff that Chris wanted

v5: check for i==0 in gen6_ggtt_bind_object to shut up gcc (Ben)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by [v4]: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Make the cache_level -> agp_flags conversion for pre-gen6 a
tad more robust by mapping everything != CACHE_NONE to the cached agp
flag - we have a 1:1 uncached mapping, but different modes of
cacheable (at least on later generations). Suggested by Chris Wilson.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-11-11 23:51:42 +01:00
Daniel Vetter
cfc1a06206 drm: add helper to sort panels to the head of the connector list
Userspace seems to like this, see

commit cb0953d734
Author: Adam Jackson <ajax@redhat.com>
Date:   Fri Jul 16 14:46:29 2010 -0400

    drm/i915: Initialize LVDS and eDP outputs before anything else

    This makes them sort to the front in X, which makes them likely to be
    the primary outputs if you haven't specified a preference in your DE,
    which is likely to be what you want.

    Signed-off-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Eric Anholt <eric@anholt.net>

Sorting the connector list after the fact is much easier than trying
to be clever with the init sequence.

Acked-by: Dave Airlie <airlied@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-11-11 23:51:28 +01:00
Lee Jones
76f93992e4 mfd: Provide the STMPE driver with its own IRQ domain
The STMPE driver is yet another IRQ controller which requires its
own IRQ domain. So, we provide it with one.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-11-11 23:35:03 +01:00
Linus Walleij
ae1cde8c50 Merge branch 'nomadik' into devel 2012-11-11 19:12:46 +01:00
Linus Walleij
50309a9c2e gpiolib: iron out include ladder mistakes
The <*/gpio.h> includes are updated again: now we need to account
for the problem introduced by commit:
595679a8038584df7b9398bf34f61db3c038bfea
"gpiolib: fix up function prototypes etc"

Actually we need static inlines in include/asm-generic/gpio.h
as well since we may have GPIOLIB but not PINCTRL.
Make sure to move all the CONFIG_PINCTRL business
to the end of the file so we are sure we have
declared struct gpio_chip.

And we need to keep the static inlines in <linux/gpio.h>
but here for the !CONFIG_GENERIC_GPIO case, and then we
may as well throw in a few warnings like the other
prototypes there, if someone would have the bad taste
of compiling without GENERIC_GPIO even.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-11-11 19:06:07 +01:00
Linus Walleij
1e63d7b936 gpiolib: separation of pin concerns
The fact that of_gpiochip_add_pin_range() and
gpiochip_add_pin_range() share too much code is fragile and
will invariably mean that bugs need to be fixed in two places
instead of one.

So separate the concerns of gpiolib.c and gpiolib-of.c and
have the latter call the former as back-end. This is necessary
also when going forward with other device descriptions such
as ACPI.

This is done by:

- Adding a return code to gpiochip_add_pin_range() so we can
  reliably check whether this succeeds.

- Get rid of the custom of_pinctrl_add_gpio_range() from
  pinctrl. Instead create of_pinctrl_get() to just retrive the
  pin controller per se from an OF node. This composite
  function was just begging to be deleted, it was way to
  purpose-specific.

- Use pinctrl_dev_get_name() to get the name of the retrieved
  pin controller and use that to call back into the generic
  gpiochip_add_pin_range().

Now the pin range is only allocated and tied to a pin
controller from the core implementation in gpiolib.c.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-11-11 19:06:07 +01:00
Linus Walleij
165adc9c17 gpiolib: fix up function prototypes etc
Commit 69e1601bca88809dc118abd1becb02c15a02ec71
"gpiolib: provide provision to register pin ranges"

Got most of it's function prototypes wrong, so fix this up by:

- Moving the void declarations into static inlines in
  <linux/gpio.h> (previously the actual prototypes were declared
  here...)

- Declare the gpiochip_add_pin_range() and
  gpiochip_remove_pin_ranges() functions in <asm-generic/gpio.h>
  together with the pin range struct declaration itself.

- Actually only implement these very functions in gpiolib.c
  if CONFIG_PINCTRL is set.

- Additionally export the symbols since modules will need to
  be able to do this.

Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-11-11 19:06:04 +01:00
Linus Walleij
a6c45b99a6 pinctrl/coh901: use irqdomain, allocate irqdescs
This switches the COH 901 pinctrl driver to allocate its GPIO
IRQs dynamically, and start to use a linear irqdomain to map
from the hardware IRQs.

This way we can cut away the complex allocation of IRQ numbers
from the <mach/irqs.h> file.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-11-11 19:06:02 +01:00
Shiraz Hashim
f23f1516b6 gpiolib: provide provision to register pin ranges
pinctrl subsystem needs gpio chip base to prepare set of gpio
pin ranges, which a given pinctrl driver can handle. This is
important to handle pinctrl gpio request calls in order to
program a given pin properly for gpio operation.

As gpio base is allocated dynamically during gpiochip
registration, presently there exists no clean way to pass this
information to the pinctrl subsystem.

After few discussions from [1], it was concluded that may be
gpio controller reporting the pin range it supports, is a
better way than pinctrl subsystem directly registering it.

[1] http://comments.gmane.org/gmane.linux.ports.arm.kernel/184816

Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
[Edited documentation a bit]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-11-11 19:06:00 +01:00
Viresh Kumar
7e10ee68f8 Revert "pinctrl: remove pinctrl_remove_gpio_range"
This reverts earlier commit which removed
pinctrl_remove_gpio_range(), because at that time there
weren't any more users of that routine. It was removed as the
removal of ranges was done in unregister of pinctrl.

But as we are now registering stuff from gpiolib, we may
remove and insert a gpio module multiple times. So, we
need this routine again.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-11-11 19:05:59 +01:00
David S. Miller
d4185bbf62 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts:
	drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c

Minor conflict between the BCM_CNIC define removal in net-next
and a bug fix added to net.  Based upon a conflict resolution
patch posted by Stephen Rothwell.

Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-10 18:32:51 -05:00
Linus Torvalds
b251f0f399 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Pull networking fixes from David Miller:
 "Bug fixes galore, mostly in drivers as is often the case:

  1) USB gadget and cdc_eem drivers need adjustments to their frame size
     lengths in order to handle VLANs correctly.  From Ian Coolidge.

  2) TIPC and several network drivers erroneously call tasklet_disable
     before tasklet_kill, fix from Xiaotian Feng.

  3) r8169 driver needs to apply the WOL suspend quirk to more chipsets,
     fix from Cyril Brulebois.

  4) Fix multicast filters on RTL_GIGA_MAC_VER_35 r8169 chips, from
     Nathan Walp.

  5) FDB netlink dumps should use RTM_NEWNEIGH as the message type, not
     zero.  From John Fastabend.

  6) Fix smsc95xx tx checksum offload on big-endian, from Steve
     Glendinning.

  7) __inet_diag_dump() needs to repsect and report the error value
     returned from inet_diag_lock_handler() rather than ignore it.
     Otherwise if an inet diag handler is not available for a particular
     protocol, we essentially report success instead of giving an error
     indication.  Fix from Cyrill Gorcunov.

  8) When the QFQ packet scheduler sees TSO/GSO packets it does not
     handle things properly, and in fact ends up corrupting it's
     datastructures as well as mis-schedule packets.  Fix from Paolo
     Valente.

  9) Fix oopser in skb_loop_sk(), from Eric Leblond.

  10) CXGB4 passes partially uninitialized datastructures in to FW
      commands, fix from Vipul Pandya.

  11) When we send unsolicited ipv6 neighbour advertisements, we should
      send them to the link-local allnodes multicast address, as per
      RFC4861.  Fix from Hannes Frederic Sowa.

  12) There is some kind of bug in the usbnet's kevent deferral
      mechanism, but more immediately when it triggers an uncontrolled
      stream of kernel messages spam the log.  Rate limit the error log
      message triggered when this problem occurs, as sending thousands
      of error messages into the kernel log doesn't help matters at all,
      and in fact makes further diagnosis more difficult.

      From Steve Glendinning.

  13) Fix gianfar restore from hibernation, from Wang Dongsheng.

  14) The netlink message attribute sizes are wrong in the ipv6 GRE
      driver, it was using the size of ipv4 addresses instead of ipv6
      ones :-) Fix from Nicolas Dichtel."

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  gre6: fix rtnl dump messages
  gianfar: ethernet vanishes after restoring from hibernation
  usbnet: ratelimit kevent may have been dropped warnings
  ipv6: send unsolicited neighbour advertisements to all-nodes
  net: usb: cdc_eem: Fix rx skb allocation for 802.1Q VLANs
  usb: gadget: g_ether: fix frame size check for 802.1Q
  cxgb4: Fix initialization of SGE_CONTROL register
  isdn: Make CONFIG_ISDN depend on CONFIG_NETDEVICES
  cxgb4: Initialize data structures before using.
  af-packet: fix oops when socket is not present
  pkt_sched: enable QFQ to support TSO/GSO
  net: inet_diag -- Return error code if protocol handler is missed
  net: bnx2x: Fix typo in bnx2x driver
  smsc95xx: fix tx checksum offload for big endian
  rtnetlink: Use nlmsg type RTM_NEWNEIGH from dflt fdb dump
  ptp: update adjfreq callback description
  r8169: allow multicast packets on sub-8168f chipset.
  r8169: Fix WoL on RTL8168d/8111d.
  drivers/net: use tasklet_kill in device remove/close process
  tipc: do not use tasklet_disable before tasklet_kill
2012-11-10 22:03:49 +01:00
Linus Torvalds
2b1768f39a Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
Pull sparc fixes from David Miller:
 "Several build/bug fixes for sparc, including:

  1) Configuring a mix of static vs.  modular sparc64 crypto modules
     didn't work, remove an ill-conceived attempt to only have to build
     the device match table for these drivers once to fix the problem.

     Reported by Meelis Roos.

  2) Make the montgomery multiple/square and mpmul instructions actually
     usable in 32-bit tasks.  Essentially this involves providing 32-bit
     userspace with a way to use a 64-bit stack when it needs to.

  3) Our sparc64 atomic backoffs don't yield cpu strands properly on
     Niagara chips.  Use pause instruction when available to achieve
     this, otherwise use a benign instruction we know blocks the strand
     for some time.

  4) Wire up kcmp

  5) Fix the build of various drivers by removing the unnecessary
     blocking of OF_GPIO when SPARC.

  6) Fix unintended regression wherein of_address_to_resource stopped
     being provided.  Fix from Andreas Larsson.

  7) Fix NULL dereference in leon_handle_ext_irq(), also from Andreas
     Larsson."

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc64: Fix build with mix of modular vs. non-modular crypto drivers.
  sparc: Support atomic64_dec_if_positive properly.
  of/address: sparc: Declare of_address_to_resource() as an extern function for sparc again
  sparc32, leon: Check for existent irq_map entry in leon_handle_ext_irq
  sparc: Add sparc support for platform_get_irq()
  sparc: Allow OF_GPIO on sparc.
  qlogicpti: Fix build warning.
  sparc: Wire up sys_kcmp.
  sparc64: Improvde documentation and readability of atomic backoff code.
  sparc64: Use pause instruction when available.
  sparc64: Fix cpu strand yielding.
  sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
2012-11-10 21:58:34 +01:00
Jonathan Cameron
92d1079b28 staging:iio: add a callback buffer for in kernel push interface
This callback buffer is meant to be opaque to users, but basically
adds a very simple pass through buffer to which data may be
pushed when it is inserted into the buffer list.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-11-10 10:17:27 +00:00
Jonathan Cameron
0464415dd2 staging:iio:in kernel users: Add a data field for channel specific info.
Used to allow information about a given channel mapping to be passed
through from board files to the consumer drivers.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-11-10 10:17:27 +00:00
Jonathan Cameron
84b36ce5f7 staging:iio: Add support for multiple buffers
Route all buffer writes through the demux.
Addition or removal of a buffer results in tear down and
setup of all the buffers for a given device.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Tested-by: srinivas pandruvada <srinivas.pandruvada@intel.com>
2012-11-10 10:17:21 +00:00
Henrik Rydberg
800963fd59 Input: document new members of struct input_dev
Fixes kernel-doc warnings for the members added in 3.7-rc1.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2012-11-10 00:40:24 -08:00
Linus Torvalds
0020dd0b8c Bug-fixes:
* Fix compile issues on ARM.
  * Fix hypercall fallback code for old hypervisors.
  * Print out which HVM parameter failed if it fails.
  * Fix idle notifier call after irq_enter.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.12 (GNU/Linux)
 
 iQEcBAABAgAGBQJQnQdGAAoJEFjIrFwIi8fJPBAIAMX1HRx3udqhv7fziynZvFTb
 hj47XYIJHOK7P4fK7vZoSNgMHjL6LW5cUqC8VN67G3zUSkX9JYFsPBj6v4bWn+rG
 b9CS+MW7hS80LGbbqkh1F+YSEfZ863RlF9PPX2acaHTw49MlIgIqwhxIo6hy+Nm6
 thu6SlbEIJkSUdhbYMOAmy5aH/3+UuuQg+oq3P7mzV8fZjEihnrrF0NlT4wOZK1o
 gsfrKYKJLVT526W9PF/L23/A/MCHMpvjNStpaDLOGNjV9sBMpJI8JRax6+657+q1
 0kXvN5mAwTKWOaXBl4LEC9R8n1IKB91TgOY6HJAcXkb1eoP5KAeNSmU8RbsZ2T0=
 =XZ+0
 -----END PGP SIGNATURE-----

Merge tag 'stable/for-linus-3.7-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

Pull Xen fixes from Konrad Rzeszutek Wilk:
 "There are three ARM compile fixes (we forgot to export certain
  functions and if the drivers are built as an module - we go belly-up).

  There is also an mismatch of irq_enter() / exit_idle() calls sequence
  which were fixed some time ago in other piece of codes, but failed to
  appear in the Xen code.

  Lastly a fix for to help in the field with troubleshooting in case we
  cannot get the appropriate parameter and also fallback code when
  working with very old hypervisors."

Bug-fixes:
 - Fix compile issues on ARM.
 - Fix hypercall fallback code for old hypervisors.
 - Print out which HVM parameter failed if it fails.
 - Fix idle notifier call after irq_enter.

* tag 'stable/for-linus-3.7-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen/arm: Fix compile errors when drivers are compiled as modules (export more).
  xen/arm: Fix compile errors when drivers are compiled as modules.
  xen/generic: Disable fallback build on ARM.
  xen/events: fix RCU warning, or Call idle notifier after irq_enter()
  xen/hvm: If we fail to fetch an HVM parameter print out which flag it is.
  xen/hypercall: fix hypercall fallback code for very old hypervisors
2012-11-10 06:56:21 +01:00
Donald Dutile
bff73156d3 PCI: Provide method to reduce the number of total VFs supported
Some implementations of SRIOV provide a capability structure
value of TotalVFs that is greater than what the software can support.
Provide a method to reduce the capability structure reported value
to the value the driver can support.
This ensures sysfs reports the current capability of the system,
hardware and software.
Example for its use: igb & ixgbe -- report 8 & 64 as TotalVFs,
but drivers only support 7 & 63 maximum.

Signed-off-by: Donald Dutile <ddutile@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2012-11-09 21:37:39 -07:00
Donald Dutile
1789382a72 PCI: SRIOV control and status via sysfs
Provide files under sysfs to determine the maximum number of VFs
an SR-IOV-capable PCIe device supports, and methods to enable and
disable the VFs on a per-device basis.

Currently, VF enablement by SR-IOV-capable PCIe devices is done
via driver-specific module parameters.  If not setup in modprobe files,
it requires admin to unload & reload PF drivers with number of desired
VFs to enable.  Additionally, the enablement is system wide: all
devices controlled by the same driver have the same number of VFs
enabled.  Although the latter is probably desired, there are PCI
configurations setup by system BIOS that may not enable that to occur.

Two files are created for the PF of PCIe devices with SR-IOV support:

    sriov_totalvfs	Contains the maximum number of VFs the device
			could support as reported by the TotalVFs register
			in the SR-IOV extended capability.

    sriov_numvfs	Contains the number of VFs currently enabled on
			this device as reported by the NumVFs register in
			the SR-IOV extended capability.

			Writing zero to this file disables all VFs.

			Writing a positive number to this file enables that
			number of VFs.

These files are readable for all SR-IOV PF devices.  Writes to the
sriov_numvfs file are effective only if a driver that supports the
sriov_configure() method is attached.

Signed-off-by: Donald Dutile <ddutile@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2012-11-09 20:10:39 -07:00
Jesse Gross
f8f626754e ipv6: Move ipv6_find_hdr() out of Netfilter code.
Open vSwitch will soon also use ipv6_find_hdr() so this moves it
out of Netfilter-specific code into a more common location.

Signed-off-by: Jesse Gross <jesse@nicira.com>
2012-11-09 17:05:07 -08:00
Nicolas Dichtel
c075b13098 ip6tnl: advertise tunnel param via rtnl
It is usefull for daemons that monitor link event to have the full parameters of
these interfaces when a rtnl message is sent.
It allows also to dump them via rtnetlink.

It is based on what is done for GRE tunnels.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-09 19:36:20 -05:00
Nicolas Dichtel
0974658da4 ipip: advertise tunnel param via rtnl
It is usefull for daemons that monitor link event to have the full parameters of
these interfaces when a rtnl message is sent.
It allows also to dump them via rtnetlink.

It is based on what is done for GRE tunnels.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-09 19:36:20 -05:00
Andreas Larsson
0bce04be44 of/address: sparc: Declare of_address_to_resource() as an extern function for sparc again
This bug-fix makes sure that of_address_to_resource is defined extern for sparc
so that the sparc-specific implementation of of_address_to_resource() is once
again used when including include/linux/of_address.h in a sparc context. A
number of drivers in mainline relies on this function working for sparc.

The bug was introduced in a850a75544, "of/address:
add empty static inlines for !CONFIG_OF". Contrary to that commit title, the
static inlines are added for !CONFIG_OF_ADDRESS, and CONFIG_OF_ADDRESS is never
defined for sparc. This is good behavior for the other functions in
include/linux/of_address.h, as the extern functions defined in
drivers/of/address.c only gets linked when OF_ADDRESS is configured. However,
for of_address_to_resource there exists a sparc-specific implementation in
arch/sparc/arch/sparc/kernel/of_device_common.c

Solution suggested by: Sam Ravnborg <sam@ravnborg.org>

Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-09 16:30:50 -08:00
Tony Lindgren
edf8dde393 Merge branch 'linus' into omap-for-v3.8/cleanup-headers-prepare-multiplatform-v3 2012-11-09 14:58:01 -08:00
Tony Lindgren
f56f52e02a Merge branch 'omap-for-v3.8/cleanup-headers-prepare-multiplatform-v3' into omap-for-v3.8/dt
Conflicts:
	arch/arm/plat-omap/dmtimer.c

Resolved as suggested by Jon Hunter.
2012-11-09 14:54:17 -08:00
David Howells
c48c8d51c2 Fix the wanxl firmware to include missing constants
Fix the wanxl firmware to include missing constants such as PARITY_NONE.  It
should be #including the linux/hdlc/ioctl.h header.

To make this work, we also have to guard parts of ioctl.h with !__ASSEMBLY__.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-09 16:28:37 -05:00
David Howells
d77807230e UAPI: (Scripted) Disintegrate include/linux/hdlc
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Dave Jones <davej@redhat.com>
Acked-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-09 16:27:51 -05:00
Linus Torvalds
a4275153cc MMC fixes for 3.7-rc5:
- sdhci: fix a NULL dereference at resume-time, seen on OLPC XO-4
  - sdhci: fix against 3.7-rc1 for UHS modes without a vqmmc regulator
  - sdhci-of-esdhc: disable CMD23 on boards where it's broken
  - sdhci-s3c: fix against 3.7-rc1 for card detection with runtime PM
  - dw_mmc, omap_hsmmc: fix potential NULL derefs, compiler warnings
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.12 (GNU/Linux)
 
 iQIcBAABAgAGBQJQnF8PAAoJEHNBYZ7TNxYMoe0P/0W9UtyoJ9UJy/QWQDU1vf8F
 c358UBmV3VkzlzKNEtwxjStwvHf3XcCqF1A0z1GAP5efhSQtb4aZxBYtNcA2FfJ0
 eOnrQaqi8hvy82hBHOqBTDnXA7HDRHCzb1U9x3XL5nvEXi6NLXhxiGO16PzkYDH2
 2JCxVwMpcEHSl+fVQVt+XR55HG53u3Qu17T2jKD8ys7TkEPIukch0rHsbvgri4r+
 k8OXIbxa66UMVePfdDH5inHt9jNfloBe0mc+xbIqfU740NcCH8pS9SuIX0U8Mevh
 Vmc6vzqp2X+ccuUCO+1fWw/neXfMDmyeXVFKGsoNG5LqDkLQv/58OMCAYS2DOcMX
 DhGcAujwKAlmnD0qvb1OvtppihFLfhFnn2pFbJGkynm7Lbv24fCNobkxhS9gadbr
 jrxjiZh7CkTzPz+gh61q5P50MCJRo7VhZUd8Omg7ygtWKJ/NAuf/j/BXerxMq4m8
 p7shlNgbJKTp9oezjsaKdE/pAuF38sFyp9KBGscqoWSHNpfL/U1vLyK1BQteCkYp
 j09x+dZ2aPlnPRvIu+29D4ZDR06nPxVlCqPd8iuB0POEVW9lydiuK5v0F616x1TI
 lh+wl7Ao8ufr8Zz+1ybuPFnTdGq2btRN7aCGj/48m2qOq0stHMkTKFN6jU3huZ+d
 +fZuZnrSsJ0Bm3V1aWUG
 =bi4C
 -----END PGP SIGNATURE-----

Merge tag 'mmc-fixes-for-3.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc

Pull MMC fixes from Chris Ball:
 - sdhci: fix a NULL dereference at resume-time, seen on OLPC XO-4
 - sdhci: fix against 3.7-rc1 for UHS modes without a vqmmc regulator
 - sdhci-of-esdhc: disable CMD23 on boards where it's broken
 - sdhci-s3c: fix against 3.7-rc1 for card detection with runtime PM
 - dw_mmc, omap_hsmmc: fix potential NULL derefs, compiler warnings

* tag 'mmc-fixes-for-3.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc:
  mmc: sdhci-s3c: fix the card detection in runtime-pm
  mmc: sdhci-s3c: use clk_prepare_enable and clk_disable_unprepare
  mmc: dw_mmc: constify dw_mci_idmac_ops in exynos back-end
  mmc: dw_mmc: fix modular build for exynos back-end
  mmc: sdhci: fix NULL dereference in sdhci_request() tuning
  mmc: sdhci: fix IS_ERR() checking of regulator_get()
  mmc: fix sdhci-dove probe/removal
  mmc: sh_mmcif: fix use after free
  mmc: sdhci-pci: fix 'Invalid iomem size' error message condition
  mmc: mxcmmc: Fix MODULE_ALIAS
  mmc: omap_hsmmc: fix NULL pointer dereference for dt boot
  mmc: omap_hsmmc: fix host reference after mmc_free_host
  mmc: dw_mmc: fix multiple drv_data NULL dereferences
  mmc: dw_mmc: enable controller interrupt before calling mmc_start_host
  mmc: sdhci-of-esdhc: disable CMD23 for some Freescale SoCs
  mmc: dw_mmc: remove _dev_info compile warning
  mmc: dw_mmc: convert the variable type of irq
2012-11-09 21:32:33 +01:00
Jingoo Han
b891b4dc1e PCI: Fix bit definitions of PCI_EXP_LNKCAP2 register
According to the PCIe 3.0 spec, PCI_EXP_LNKCAP2_SLS_2_5GB is
1st bit of PCI_EXP_LNKCAP2 register, not 0th bit. So, the bit
definition of supported link speed vector should be fixed.

[bhelgaas: change "Current" to "Supported"]
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2012-11-09 11:17:59 -07:00
Tejun Heo
574bd9f7c7 cgroup: implement generic child / descendant walk macros
Currently, cgroup doesn't provide any generic helper for walking a
given cgroup's children or descendants.  This patch adds the following
three macros.

* cgroup_for_each_child() - walk immediate children of a cgroup.

* cgroup_for_each_descendant_pre() - visit all descendants of a cgroup
  in pre-order tree traversal.

* cgroup_for_each_descendant_post() - visit all descendants of a
  cgroup in post-order tree traversal.

All three only require the user to hold RCU read lock during
traversal.  Verifying that each iterated cgroup is online is the
responsibility of the user.  When used with proper synchronization,
cgroup_for_each_descendant_pre() can be used to propagate state
updates to descendants in reliable way.  See comments for details.

v2: s/config/state/ in commit message and comments per Michal.  More
    documentation on synchronization rules.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujisu.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Li Zefan <lizefan@huawei.com>
2012-11-09 09:12:29 -08:00