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

Browse source 
- 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.
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Merge tag 'gpio-v4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO fixes from Linus Walleij:
 "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"

* tag 'gpio-v4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: drop lock before reading GPIO direction
  gpio: bail out silently on NULL descriptors
  gpio: handle compatible ioctl() pointers
  gpio: flush direction status in gpiochip_lock_as_irq()
  gpio: lpc32xx: disable broken to_irq support
This commit is contained in:
Linus Torvalds 2016-05-31 09:27:00 -07:00
commit 5eca831742
2 changed files with 41 additions and 58 deletions
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