linux-kernel - Re: [PATCH v2] ath9k: sleep for less time when unregistering hwrng

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Message-ID: <YrlR7O4roipJt4Nc@gondor.apana.org.au>
Date:   Mon, 27 Jun 2022 14:45:00 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Gregory Erwin <gregerwin256@...il.com>,
        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 v2] ath9k: sleep for less time when unregistering hwrng

On Fri, Jun 24, 2022 at 10:44:33PM +0200, Jason A. Donenfeld wrote:
.
> diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
> index 16f227b995e8..af1c1905bb7e 100644
> --- a/drivers/char/hw_random/core.c
> +++ b/drivers/char/hw_random/core.c
> @@ -513,8 +513,13 @@ static int hwrng_fillfn(void *unused)
>  			break;
>  
>  		if (rc <= 0) {
> -			pr_warn("hwrng: no data available\n");
> -			msleep_interruptible(10000);
> +			int i;
> +
> +			for (i = 0; i < 100; ++i) {
> +				if (kthread_should_stop() ||
> +				    msleep_interruptible(10000 / 100))
> +					goto out;
> +			}

Please use schedule_timeout_interruptible.  But if you're going
to make it interruptible it should probably at least try to do
something about signals rather than just ignore them.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt