linux-kernel - Re: [PATCH 2/3] virtio: rng: delay hwrng

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Message-ID: <20140721111027.GA12925@grmbl.mre>
Date:	Mon, 21 Jul 2014 16:40:27 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Virtualization List <virtualization@...ts.linux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	herbert@...dor.apana.org.au, keescook@...omium.org,
	jason@...edaemon.net, Amos Kong <akong@...hat.com>
Subject: Re: [PATCH 2/3] virtio: rng: delay hwrng_register() till driver is
 ready

On (Mon) 21 Jul 2014 [15:01:00], Amit Shah wrote:
> Instead of calling hwrng_register() in the probe routing, call it in the
> scan routine.  This ensures that when hwrng_register() is successful,
> and it requests a few random bytes to seed the kernel's pool at init,
> we're ready to service that request.
> 
> This will also enable us to remove the workaround added previously to
> check whether probe was completed, and only then ask for data from the
> host.  The revert follows in the next commit.
> 
> Signed-off-by: Amit Shah <amit.shah@...hat.com>
> ---
>  drivers/char/hw_random/virtio-rng.c | 25 +++++++++++++++----------
>  1 file changed, 15 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c
> index d8ffebd..32e6373 100644
> --- a/drivers/char/hw_random/virtio-rng.c
> +++ b/drivers/char/hw_random/virtio-rng.c
> @@ -38,6 +38,7 @@ struct virtrng_info {
>  };
>  
>  static bool probe_done;
> +static bool hwrng_register_done;

Ah; this needs to be per-device after the recent multi-device work,
rather than a global.

New patches coming up.


		Amit
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