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Date:	Sat, 29 Nov 2014 06:36:01 +0530
From:	Sujith Manoharan <sujith@...jith.org>
To:	Andrej Gelenberg <andrej.gelenberg@....edu>
Cc:	<linux-kernel@...r.kernel.org>,
	Rajkumar Manoharan <rmanohar@....qualcomm.com>,
	Felix Fietkau <nbd@...nwrt.org>,
	"John W. Linville" <linville@...driver.com>
Subject: Re: ath: phy1: DMA failed to stop in 10 ms

Andrej Gelenberg wrote:
> i got some problems with my Qualcomm Atheros AR9485 wlan pcie card. I
> use my card as access point (with hotspotd) on amd64 machine. I use
> self compiled vanilla kernel 3.17.4 and a get a lot of 
> "DMA failed to stop" messages in my kernel log. I found some reports on
> similar errors for *wrt, ubuntu and other distros in various
> operation modes (ap and client). Increasing the timeout in mac.c to 100
> ms do not help. iommu=soft do not help either and GART iommu is not an
> option (usb don't work for me with amd_iommu=off). I found this patch:
> https://dev.openwrt.org/browser/trunk/package/mac80211/patches/552-ath9k_rx_dma_stop_check.patch?rev=34910 ,
> which seems to apply to my problem, but i am not sure if it is a proper
> solution.

Can you please open a bug on bugzilla.kernel.org ?

Sujith
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