linux-kernel - Re: [PATCH] Repair soft lockup with monitor mode of ath9k

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Message-ID: <87d25wzgwr.fsf@kamboji.qca.qualcomm.com>
Date:	Fri, 30 Jan 2015 12:44:52 +0200
From:	Kalle Valo <kvalo@...eaurora.org>
To:	yuweizheng@....com
Cc:	linux-kernel@...r.kernel.org, ath9k-devel@...ts.ath9k.org,
	linux-wireless@...r.kernel.org, ath9k-devel@....qualcomm.com,
	linux@...pel-privat.de, netdev@...r.kernel.org,
	Yuwei Zheng <zhengyuwei@....cn>
Subject: Re: [PATCH] Repair soft lockup with monitor mode of ath9k_htc card

yuweizheng@....com writes:

> From: Yuwei Zheng <yuweizheng@....com>
>
> In the environment with heavy wifi traffic, set the ar9271 into
> monitor mode, will trigger a deadloop panic.
>  
> The ath9k_hif_usb_rx_cb function excute on  the interrupt context, and ath9k_rx_tasklet excute
> on the soft irq context. In other words, the ath9k_hif_usb_rx_cb have more chance to excute than
> ath9k_rx_tasklet.  So in the worst condition,  the rx.rxbuf receive list is always full,
> and the do {}while(true) loop will not be break. The kernel get a soft lockup panic. 

Word wrapping is too long and please prefix the title with "ath9k_htc: ".

-- 
Kalle Valo
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