rtl8821ae bisected regression between 4.1 and 4.2

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Hello linux-wirelless (cc'ing stable since the original patch had
cc:stable as well),

I'm experiencing a CPU soft lockup while downloading when rtl8821ae is
loaded (even when downloading through other adapters) on a vanilla 4.2
kernel. The problem did not happen on vanilla 4.1. Bisecting shows the
first bad commit being "rtlwifi: Remove the clear interrupt routine
from all drivers" (1277fa2ab2f9a624a4b0177119ca13b5fd65edd0).
Reverting that commit makes the problem go away.

The system is perfectly stable until I start downloading, when the UI
becomes unresponsive, sometimes leading to a complete freeze. When the
system does not completely freezes and I'm able to kill the download,
everything seems to go back to normal after killing it, and I am able
to continue to use the computer as long as I do not download anything.
Most of the time either a soft or a hard lockup is detected, but not
always, although the freeze always occurs.

This is the kernel log with lockdep enabled (although sometimes the
problem does not occur with lockdep enabled):
https://gist.github.com/jprvita/3aa2c0c9a66793e1fad1

I have the laptop where this happens as a test machine sitting on my
desk, so I'm available to test any patches or gather more information
if needed. Please advise on how I can help debugging this further.

Regards,

--
João Paulo Rechi Vita
http://about.me/jprvita
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