From: Felix Fietkau <nbd@openwrt.org>
Date: Wed, 02 Nov 2011 14:19:33 +0100
Subject: [ath9k-devel] [PATCH] ath9k: preserve DFS flags in calcrxfilter
In-Reply-To: <1320235803-12190-1-git-send-email-zefir.kurtisi@neratec.com>
References: <1320235803-12190-1-git-send-email-zefir.kurtisi@neratec.com>
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On 2011-11-02 1:10 PM, Zefir Kurtisi wrote:
> RX filter flags previously set for DFS radar detection were not
> preserved after "ath9k: disable unnecessary PHY error reporting".
>
> This patch ensures that the flags required for DFS support are
> kept set.
>
> Signed-off-by: Zefir Kurtisi<zefir.kurtisi@neratec.com>
I think preserving the existing register values is a bit fragile wrt. 
hardware resets, register clobbering, etc.
How about just adding an internal flag or bool in the softc?

- Felix