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Gmane
From: Arnd Bergmann <arnd <at> arndb.de>
Subject: [PATCH, RFC 00/30] sleep_on removal
Newsgroups: gmane.linux.kernel
Date: Thursday 2nd January 2014 12:07:24 UTC (over 2 years ago)
The functions sleep_on, sleep_on_timeout, interruptible_sleep_on
and interruptible_sleep_on_timeout have been deprecated for as
long as I can remember, and a number of people have contributed
patches in the past to remove them from various drivers.

This has recently popped up again and I decided to spend some
of my time on tracking down the last users and kill it for good.
The work is somewhat related to the BKL removal I did a couple
of years ago, since most of these drivers were using the BKL
in a way that actually made the sleep_on function safe to call.
As the BKL was converted into mutexes, the semantics changed
slightly and typically opened up a race between checking
a condition and going to sleep.

I don't have any of the hardware that I'm sending the patches
for, so it would be great if someone could test them before
they get applied. Otherwise please review very carefully.

I'm definitely happy for any patches to go into maintainer
trees right away. Obviously the final patch cannot go in
until everything else gets merged first and I suspect there
will be a series of patches for maintainerless drivers that
will go along with it.

	Arnd

Arnd Bergmann (30):
  ataflop: fix sleep_on races
  scsi: atari_scsi: fix sleep_on race
  DAC960: remove sleep_on usage
  swim3: fix interruptible_sleep_on race
  [media] omap_vout: avoid sleep_on race
  [media] usbvision: remove bogus sleep_on_timeout
  [media] radio-cadet: avoid interruptible_sleep_on race
  [media] arv: fix sleep_on race
  staging: serqt_usb2: don't use sleep_on
  staging: gdm72xx: fix interruptible_sleep_on race
  staging: panel: fix interruptible_sleep_on race
  parport: fix interruptible_sleep_on race
  cris: sync_serial: remove interruptible_sleep_on
  tty/amiserial: avoid interruptible_sleep_on
  usbserial: stop using interruptible_sleep_on
  tty: synclink: avoid sleep_on race
  atm: nicstar: remove interruptible_sleep_on_timeout
  atm: firestream: fix interruptible_sleep_on race
  isdn: pcbit: fix interruptible_sleep_on race
  isdn: hisax/elsa: fix sleep_on race in elsa FSM
  isdn: divert, hysdn: fix interruptible_sleep_on race
  isdn: fix multiple sleep_on races
  oss: msnd_pinnacle: avoid interruptible_sleep_on_timeout
  oss: midibuf: fix sleep_on races
  oss: vwsnd: avoid interruptible_sleep_on
  oss: dmasound: kill SLEEP() macro to avoid race
  oss: remove last sleep_on users
  sgi-xp: open-code interruptible_sleep_on_timeout
  char: nwbutton: open-code interruptible_sleep_on
  sched: remove sleep_on() and friends

 Documentation/DocBook/kernel-hacking.tmpl    | 10 ------
 arch/cris/arch-v10/drivers/sync_serial.c     |  4 ++-
 arch/cris/arch-v32/drivers/sync_serial.c     |  4 ++-
 drivers/atm/firestream.c                     |  4 +--
 drivers/atm/nicstar.c                        | 13 ++++----
 drivers/block/DAC960.c                       | 34 +++++++++----------
 drivers/block/ataflop.c                      | 16 ++++-----
 drivers/block/swim3.c                        | 18 ++++++----
 drivers/char/nwbutton.c                      |  5 ++-
 drivers/char/pcmcia/synclink_cs.c            |  4 +--
 drivers/isdn/divert/divert_procfs.c          |  7 ++--
 drivers/isdn/hisax/elsa.c                    |  9 +++--
 drivers/isdn/hisax/elsa_ser.c                |  3 +-
 drivers/isdn/hysdn/hysdn_proclog.c           |  7 ++--
 drivers/isdn/i4l/isdn_common.c               | 13 +++++---
 drivers/isdn/pcbit/drv.c                     |  6 ++--
 drivers/media/platform/arv.c                 |  4 +--
 drivers/media/platform/omap/omap_vout_vrfb.c |  3 +-
 drivers/media/radio/radio-cadet.c            | 12 +++++--
 drivers/media/usb/usbvision/usbvision.h      |  4 +--
 drivers/misc/sgi-xp/xpc_channel.c            |  5 ++-
 drivers/parport/share.c                      |  3 +-
 drivers/scsi/atari_scsi.c                    | 12 +++++--
 drivers/staging/gdm72xx/gdm_usb.c            |  5 +--
 drivers/staging/panel/panel.c                |  4 +--
 drivers/staging/serqt_usb2/serqt_usb2.c      | 17 ++++------
 drivers/tty/amiserial.c                      | 26 ++++++++++-----
 drivers/tty/synclink.c                       |  4 +--
 drivers/tty/synclink_gt.c                    |  4 +--
 drivers/tty/synclinkmp.c                     |  4 +--
 drivers/usb/serial/ch341.c                   | 29 +++++++++++-----
 drivers/usb/serial/cypress_m8.c              | 49
++++++++++++++++++----------
 drivers/usb/serial/f81232.c                  | 29 +++++++++++-----
 drivers/usb/serial/pl2303.c                  | 29 +++++++++++-----
 include/linux/wait.h                         | 11 -------
 kernel/sched/core.c                          | 46
--------------------------
 sound/oss/dmabuf.c                           | 14 ++++----
 sound/oss/dmasound/dmasound.h                |  1 -
 sound/oss/dmasound/dmasound_core.c           | 28 +++++++++++-----
 sound/oss/midibuf.c                          | 18 +++++-----
 sound/oss/msnd_pinnacle.c                    | 31 ++++++++++--------
 sound/oss/sequencer.c                        | 16 ++++-----
 sound/oss/sleep.h                            | 18 ++++++++++
 sound/oss/swarm_cs4297a.c                    | 14 ++++----
 sound/oss/vwsnd.c                            | 14 +++++---
 45 files changed, 334 insertions(+), 277 deletions(-)
 create mode 100644 sound/oss/sleep.h

-- 
1.8.3.2

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