[Bug 531696] [NEW] mc13892 LED driver oopses on trigger action

[Jeremy Kerr]

Public bug reported:

Setting a LED trigger event on a babbage board will cause an oops when
that trigger occurs:

 echo mmc0 | sudo dd of=/sys/class/leds/pmic_ledsb/trigger
 sudo dd if=/dev/mmcblk0 of=/dev/null

The led_classdev's brightness_set function is called from an atomic
context, but the mc13892 LED driver's brightness_set callback may sleep,
resulting in the recursive oops.

Patch attached.

** Affects: linux-fsl-imx51 (Ubuntu)
     Importance: Undecided
     Assignee: Bryan Wu (cooloney)
         Status: New

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mc13892 LED driver oopses on trigger action
https://bugs.launchpad.net/bugs/531696
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