linux-kernel - Re: [PATCH] hwrng: core - fix racing condition when stopping hwrng

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Message-ID: <aXLiYQuXehWtvRrx@gondor.apana.org.au>
Date: Fri, 23 Jan 2026 10:52:17 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Lianjie Wang <karin0.zst@...il.com>
Cc: Olivia Mackall <olivia@...enic.com>,
	David Laight <david.laight.linux@...il.com>,
	Jonathan McDowell <noodles@...a.com>, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwrng: core - fix racing condition when stopping
 hwrng_fill

On Sun, Dec 21, 2025 at 09:24:48PM +0900, Lianjie Wang wrote:
> 
> Besides, if the hwrng_unregister() call happens immediately after a
> hwrng_register() before, the stopped thread may have never been running,

How can this happen? Surely that would mean that the kthread_* API is
broken?

Thanks,
-- 
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