AR9882 IOMMU faults

Manoharan, Rajkumar rmanohar at
Fri Jul 8 06:09:48 PDT 2016

Logs are so limited. If possible, revert below commit and give a try

"ath10k: do not use coherent memory for allocated device memory chunks"

If revert is not so clean, try with this patch.

From: ath10k <ath10k-bounces at> on behalf of Ben Skeggs <bskeggs at>
Sent: Friday, July 8, 2016 10:59 AM
To: ath10k at
Subject: AR9882 IOMMU faults


I've just installed a COMPEX WLE600VX (AR9882) in my router machine,
operating in AP mode.

While it appears to be working well enough, I get massive floods of
IOMMU faults reported in my kernel log.  These appear to increase with
the load on the network.

I've attached both the info that ath10k reports when it detects the
device, and a sample of one of the DMAR messages (worth nothing that
it's the same fault address in all the messages).

Is this a known issue, and anything I can do to help get it resolved?


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