netdev - Re: [PATCH v2] ath9k: use hw_random API instead of directly dumping into random.c

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Date:   Wed, 16 Feb 2022 07:38:17 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     miaoqing@...eaurora.org, rsalvaterra@...il.com,
        Toke Høiland-Jørgensen 
        <toke@...e.dk>, "Sepehrdad\, Pouyan" <pouyans@....qualcomm.com>,
        ath9k-devel <ath9k-devel@....qualcomm.com>,
        "linux-wireless\@vger.kernel.org" <linux-wireless@...r.kernel.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        LKML <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [PATCH v2] ath9k: use hw_random API instead of directly dumping into random.c

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

> 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 Høiland-Jørgensen <toke@...hat.com>
> Cc: Kalle Valo <kvalo@...nel.org>
> Cc: Dominik Brodowski <linux@...inikbrodowski.net>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>

[...]

> +retry:
> +	if (max & ~3UL)
> +		bytes_read = ath9k_rng_data_read(sc, buf, max >> 2);
> +	if ((max & 3UL) && ath9k_rng_data_read(sc, &word, 1)) {
> +		memcpy(buf + bytes_read, &word, max & 3);
> +		bytes_read += max & 3;
> +		memzero_explicit(&word, sizeof(word));
> +	}
> +	if (max && unlikely(!bytes_read) && wait) {
> +		msleep(ath9k_rng_delay_get(++fail_stats));
> +		goto retry;
>  	}

Wouldn't a while loop be cleaner? With a some kind limit for the number
of loops, to avoid a neverending loop.

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