linux-kernel - Re: [PATCH] ath9k: rng: escape sleep loop when unregistering

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Message-ID: <YrYMqqqoK7HBAXgJ@zx2c4.com>
Date:   Fri, 24 Jun 2022 21:12:42 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Gregory Erwin <gregerwin256@...il.com>
Cc:     linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Kalle Valo <kvalo@...nel.org>,
        Rui Salvaterra <rsalvaterra@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH] ath9k: rng: escape sleep loop when unregistering

Hi Gregory,

On Thu, Jun 23, 2022 at 10:25:26PM -0700, Gregory Erwin wrote:
> Hi Jason,
> 
> I think you are on the right track, but even with this patch
> 'ip link set wlan0 down' blocks until the hwrng reader gives up.
> The reader can either be userspace (dd, cat, etc) or it can also
> be the rng_core module. I can replicate the hang in the two different
> situations, so I gathered two stack traces for 'ip' depending on the
> reader of hwrng:

Thanks for the traces. I'll send a v2 to you shortly.

Jason