linux-kernel - Re: padata: Is padata_find

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Message-ID: <aQxufVwZWwRfEaHG@gondor.apana.org.au>
Date: Thu, 6 Nov 2025 17:46:37 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc: syzbot <syzbot+bd936ccd4339cea66e6b@...kaller.appspotmail.com>,
	daniel.m.jordan@...cle.com, linux-kernel@...r.kernel.org,
	steffen.klassert@...unet.com, linux-crypto@...r.kernel.org
Subject: Re: padata: Is padata_find_next() thread-safe?

On Thu, Nov 06, 2025 at 06:41:19PM +0900, Tetsuo Handa wrote:
>
> OK. But what is about the "Can a sequence shown below possible?" part?

It's a false positive, i.e., it cannot dead-lock as shown.

> Is using _nested(lock, 1) wrong?

That should kill this particular warning but there could still be
similar warnings if you treat these two locks as the same class.

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