leds: fix broken devres usage

Several MFD child drivers register their class devices directly under the parent device (about half of the MFD LED drivers do so).

This means you cannot blindly do devres conversions so that deregistration ends up being tied to the parent device, something which leads to use-after-free on driver unbind when the class device is released while still being registered (and, for example, oopses on later parent MFD driver unbind or LED class callbacks, or resource leaks and name clashes on child driver reload).

Included is also a clean up removing some pointless casts when registering class devices.

All but the lm3533 one have only been compile tested.

Johan

Johan Hovold (6):
leds: 88pm860x: fix use-after-free on unbind
leds: da903x: fix use-after-free on unbind
leds: lm3533: fix use-after-free on unbind
leds: lm36274: fix use-after-free on unbind
leds: wm831x-status: fix use-after-free on unbind
leds: drop redundant struct-device pointer casts

 drivers/leds/leds-88pm860x.c      | 14 +++++++++++++-
 drivers/leds/leds-da903x.c        | 14 +++++++++++++-
 drivers/leds/leds-lm3533.c        | 12 +++++++++---
 drivers/leds/leds-lm355x.c        |  9 +++------
 drivers/leds/leds-lm36274.c       | 15 ++++++++++++---
 drivers/leds/leds-lm3642.c        |  9 +++------
 drivers/leds/leds-wm831x-status.c | 14 +++++++++++++-
 7 files changed, 66 insertions(+), 21 deletions(-)

2.26.2