[PATCH v2 0/4] gpiolib: some fixup patches

[Alexandre Courbot <acourbot@nvidia.com>]

This short series is a fixup to patch 6/9 of my previous series ("gpiolib: use
descriptors internally"), which mainly addresses issues raised by Linus W. in
this patch and a few other minor ones caught while proof-reading gpiolib.

First patch is the most significant. It mostly avoids oopses when passing an
invalid GPIO to some functions. Also gpio_get/set_value*() now return 0 when
given an invalid GPIO number instead of oopsing. I tend to think that's an
improvement, but if it's not please let me know.

Ideally these patches should be melded into the above-mentioned patch since
they were intended to become a new revision, but I leave that decision to
Grant's discretion.

This patchset has been tested on Tegra 2/Ventana with a GPIO backlight driver
and the sysfs interface.

Changes from v1:
- as suggested by Ryan Mallon, add a dedicated control flow for signaling
  invalid GPIOs to avoid meaningless error messages and ugly ternary operators
- use pr_warn instead of pr_debug to signal invalid GPIOs
- do descriptors validity check before acquiring any lock

Alexandre Courbot (4):
  gpiolib: check descriptors validity before use
  gpiolib: use const parameters when possible
  gpiolib: move comment to right function
  gpiolib: rename local offset variables to "hwgpio"

 drivers/gpio/gpiolib.c | 213 +++++++++++++++++++++++++++----------------------
 1 file changed, 117 insertions(+), 96 deletions(-)

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1.8.1.3