linux-kernel - Re: [PATCH v2 3/4] virtio: rng: delay hwrng

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Message-ID: <20140722170834.GA23129@grmbl.mre>
Date:	Tue, 22 Jul 2014 22:38:34 +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 v2 3/4] virtio: rng: delay hwrng_register() till driver
 is ready

On (Mon) 21 Jul 2014 [17:15:51], 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.
> 
> There's a slight behaviour change here on unsuccessful hwrng_register().
> Previously, when hwrng_unregister() failed, the probe() routine would

typo: should be hwrng_register().

Please fix this up when picking up the patch.

Thanks,

> fail, and the vqs would be torn down, and driver would be marked not
> initialized.  Now, the vqs will remain initialized, driver would be
> marked initialized as well, but won't be available in the list of RNGs
> available to hwrng core.  To fix the failures, the procedure remains the
> same, i.e. unload and re-load the module, and hope things succeed the
> next time around.
> 
> Signed-off-by: Amit Shah <amit.shah@...hat.com>

		Amit
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