linux-kernel - Re: [PATCH v6] ath9k: sleep for less time when unregistering hwrng

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Message-ID: <87y1xh9idl.fsf@toke.dk>
Date:   Tue, 28 Jun 2022 12:45:10 +0200
From:   Toke Høiland-Jørgensen <toke@...e.dk>
To:     "Jason A. Donenfeld" <Jason@...c4.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Gregory Erwin <gregerwin256@...il.com>,
        Kalle Valo <kvalo@...nel.org>,
        Rui Salvaterra <rsalvaterra@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        stable@...r.kernel.org
Subject: Re: [PATCH v6] ath9k: sleep for less time when unregistering hwrng

"Jason A. Donenfeld" <Jason@...c4.com> writes:

> Even though hwrng provides a `wait` parameter, it doesn't work very well
> when waiting for a long time. There are numerous deadlocks that emerge
> related to shutdown. Work around this API limitation by waiting for a
> shorter amount of time and erroring more frequently. This commit also
> prevents hwrng from splatting messages to dmesg when there's a timeout
> and switches to using schedule_timeout_interruptible(), so that the
> kthread can be stopped.
>
> Reported-by: Gregory Erwin <gregerwin256@...il.com>
> Tested-by: Gregory Erwin <gregerwin256@...il.com>
> Cc: Toke Høiland-Jørgensen <toke@...hat.com>
> Cc: Kalle Valo <kvalo@...nel.org>
> Cc: Rui Salvaterra <rsalvaterra@...il.com>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: stable@...r.kernel.org
> Fixes: fcd09c90c3c5 ("ath9k: use hw_random API instead of directly dumping into random.c")
> Link: https://lore.kernel.org/all/CAO+Okf6ZJC5-nTE_EJUGQtd8JiCkiEHytGgDsFGTEjs0c00giw@mail.gmail.com/
> Link: https://lore.kernel.org/lkml/CAO+Okf5k+C+SE6pMVfPf-d8MfVPVq4PO7EY8Hys_DVXtent3HA@mail.gmail.com/
> Link: https://bugs.archlinux.org/task/75138
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>

Acked-by: Toke Høiland-Jørgensen <toke@...e.dk>