netdev - Re: [PATCH 1/3] ath9k: add option to reset the wifi chip via debugfs

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Date:   Tue,  5 Oct 2021 14:27:48 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Linus Lüssing <linus.luessing@...3.blue>
Cc:     Felix Fietkau <nbd@....name>,
        Sujith Manoharan <c_manoha@....qualcomm.com>,
        ath9k-devel@....qualcomm.com, linux-wireless@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "John W . Linville" <linville@...driver.com>,
        Felix Fietkau <nbd@...nwrt.org>,
        Simon Wunderlich <sw@...onwunderlich.de>,
        Sven Eckelmann <sven@...fation.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Linus Lüssing <ll@...onwunderlich.de>
Subject: Re: [PATCH 1/3] ath9k: add option to reset the wifi chip via debugfs

Linus Lüssing <linus.luessing@...3.blue> wrote:

> Sometimes, in yet unknown cases the wifi chip stops working. To allow a
> watchdog in userspace to easily and quickly reset the wifi chip, add the
> according functionality to userspace. A reset can then be triggered
> via:
> 
>   $ echo 1 > /sys/kernel/debug/ieee80211/phy0/ath9k/reset
> 
> The number of user resets can further be tracked in the row "User reset"
> in the same file.
> 
> So far people usually used "iw scan" to fix ath9k chip hangs from
> userspace. Which triggers the ath9k_queue_reset(), too. The reset file
> however has the advantage of less overhead, which makes debugging bugs
> within ath9k_queue_reset() easier.
> 
> Signed-off-by: Linus Lüssing <ll@...onwunderlich.de>
> Signed-off-by: Kalle Valo <kvalo@...eaurora.org>

2 patches applied to ath-next branch of ath.git, thanks.

053f9852b95e ath9k: add option to reset the wifi chip via debugfs
4925642d5412 ath9k: Fix potential interrupt storm on queue reset

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20210914192515.9273-2-linus.luessing@c0d3.blue/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches