linux-kernel - Re: [PATCH v2] hwrng: core - move add_early_randomness() out of rng

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Message-ID: <20191012120928.GA24544@gondor.apana.org.au>
Date:   Sat, 12 Oct 2019 23:09:28 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Laurent Vivier <lvivier@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-crypto@...r.kernel.org,
        'Linux Samsung SOC' <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH v2] hwrng: core - move add_early_randomness() out of
 rng_mutex

On Fri, Oct 11, 2019 at 03:47:24PM +0200, Laurent Vivier wrote:
> add_early_randomness() is called every time a new rng backend is added
> and every time it is set as the current rng provider.
> 
> add_early_randomness() is called from functions locking rng_mutex,
> and if it hangs all the hw_random framework hangs: we can't read sysfs,
> add or remove a backend.
> 
> This patch moves add_early_randomness() out of the rng_mutex zone.
> It only needs the reading_mutex.
> 
> Signed-off-by: Laurent Vivier <lvivier@...hat.com>
> ---
> 
> Notes:
>     v2: in hwrng_register, take rng->ref only if rng is the new current_rng
> 
>  drivers/char/hw_random/core.c | 61 +++++++++++++++++++++++++----------
>  1 file changed, 44 insertions(+), 17 deletions(-)

Please rebase your patch on top of the cryptodev tree, i.e., make
this an incremental patch with a Fixes header.

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