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iwlagn: crash when unloading the module

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Hi,

I noticed today a crash when removing iwlagn module. I can see the
crash everytime on my lenovo x201 (x86 64bit, i5) with this wireless
chip:

[   19.484551] iwlagn 0000:02:00.0: Detected Intel(R) Centrino(R)
Ultimate-N 6300 AGN, REV=0x74

As I'm travelling I only have two bad quality screenshots and 40 MB
video of the crash :) From the stacktrace it looks that this is iommu
related:

http://www.adurom.com/~kvalo/tmp/iwlagn/rmmod-iommu-crash/1.png
http://www.adurom.com/~kvalo/tmp/iwlagn/rmmod-iommu-crash/2.png

This is a new laptop and most likely I haven't removed iwlagn module
before. So this shouldn't be a regression.

-- 
Kalle Valo
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