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From:   Rui Salvaterra <rsalvaterra@gmail.com>
Date:   Tue, 15 Feb 2022 22:55:18 +0000
Message-ID: <CALjTZvZb9oFLT5zOvxgt3ZrsOc+id8o3KXGFJobO6ks6UZtgWg@mail.gmail.com>
Subject: Re: [PATCH] ath9k: use hw_random API instead of directly dumping into random.c
To:     "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc:     miaoqing@codeaurora.org, Jason Cooper <jason@lakedaemon.net>,
        "Sepehrdad, Pouyan" <pouyans@qti.qualcomm.com>,
        ath9k-devel <ath9k-devel@qca.qualcomm.com>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
        Kalle Valo <kvalo@kernel.org>,
        =?UTF-8?B?VG9rZSBIw7hpbGFuZC1Kw7hyZ2Vuc2Vu?= <toke@redhat.com>,
        Dominik Brodowski <linux@dominikbrodowski.net>,
        Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        LKML <linux-kernel@vger.kernel.org>,
        Netdev <netdev@vger.kernel.org>
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Hi, Jason,

On Tue, 15 Feb 2022 at 22:44, Jason A. Donenfeld <Jason@zx2c4.com> wrote:
>
> Hardware random number generators are supposed to use the hw_random
> framework. This commit turns ath9k's kthread-based design into a proper
> hw_random driver.
>
> This compiles, but I have no hardware or other ability to determine
> whether it works. I'll leave further development up to the ath9k
> and hw_random maintainers.
>
> Cc: Toke H=C3=B8iland-J=C3=B8rgensen <toke@redhat.com>
> Cc: Kalle Valo <kvalo@kernel.org>
> Cc: Dominik Brodowski <linux@dominikbrodowski.net>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

[patch snipped]

On my laptop, with a=E2=80=A6

02:00.0 Network controller: Qualcomm Atheros AR9462 Wireless Network
Adapter (rev 01)

=E2=80=A6 I have the following=E2=80=A6

rui@arrandale:~$ cat /sys/devices/virtual/misc/hw_random/rng_available
ath9k
rui@arrandale:~$ cat /sys/devices/virtual/misc/hw_random/rng_current
ath9k
rui@arrandale:~$

=E2=80=A6 and sure enough, /dev/hwrng is created and outputs a stream of
random data, as expected. I haven't done any serious randomness
quality testing, but it should be the same as the one produced by the
original code. I consider this patch thus

Tested-by: Rui Salvaterra <rsalvaterra@gmail.com>

Thanks,
Rui