[GIT PULL] GPIO fixes for v4.7, take one

[Linus Walleij]

Hi Linus,

here is a set of GPIO fixes mostly fixing my own mistakes. The
details are in the signed tag. They are mostly about corner cases in
the infrastructure, less used features like getting a pins direction and
handling of optional GPIO lines.

Details in the signed tag.

Please pull it in!

Yours,
Linus Walleij

The following changes since commit 1a695a905c18548062509178b98bc91e67510864:

  Linux 4.7-rc1 (2016-05-29 09:29:24 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git
tags/gpio-v4.7-2

for you to fetch changes up to 545ebd9a9be6bcbcf3e8dc24b874bfd634131946:

  gpio: drop lock before reading GPIO direction (2016-05-30 17:11:59 +0200)

----------------------------------------------------------------
A bunch of GPIO fixes for the v4.7 series:

- Drop the lock before reading out the GPIO direction
  setting in drivers supporting the .get_direction()
  callback: some of them may be slowpath.

- Flush GPIO direction setting before locking a GPIO as an
  IRQ: some electronics or other poking around in the
  registers behind our back may have happened, so flush
  the direction status before trying to lock the line for
  use by IRQs.

- Bail out silently when asked to perform operations on
  NULL GPIO descriptors. That is what all the get_*_optional()
  is about: we get optional GPIO handles, if they are not
  there, we get NULL.

- Handle compatible ioctl() correctly: we need to convert
  the ioctl() pointer using compat_ptr() here like everyone
  else.

- Disable the broken .to_irq() on the LPC32xx platform.
  The whole irqchip infrastructure was replaced in the
  last merge window, and a new implementation will be
  needed.

----------------------------------------------------------------
Linus Walleij (4):
      gpio: flush direction status in gpiochip_lock_as_irq()
      gpio: handle compatible ioctl() pointers
      gpio: bail out silently on NULL descriptors
      gpio: drop lock before reading GPIO direction

Sylvain Lemieux (1):
      gpio: lpc32xx: disable broken to_irq support

 drivers/gpio/gpio-lpc32xx.c | 48 +-----------------------------------------
 drivers/gpio/gpiolib.c      | 51 +++++++++++++++++++++++++++++++++++----------
 2 files changed, 41 insertions(+), 58 deletions(-)