linux-kernel - Re: [PATCH] hw_random: move add_early_randomness() out of rng

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Date:   Thu, 10 Oct 2019 23:53:53 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Laurent Vivier <lvivier@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH] hw_random: move add_early_randomness() out of rng_mutex

On Thu, Sep 12, 2019 at 03:30:22PM +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 move add_early_randomness() out of the rng_mutex zone.
> It only needs the reading_mutex.
> 
> Signed-off-by: Laurent Vivier <lvivier@...hat.com>
> ---
>  drivers/char/hw_random/core.c | 60 +++++++++++++++++++++++++----------
>  1 file changed, 44 insertions(+), 16 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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