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Message-ID: <20090618114032.GB6596@gondor.apana.org.au>
Date: Thu, 18 Jun 2009 19:40:33 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Huang Ying <ying.huang@...el.com>
Cc: linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [BUGFIX 2/3] crypto: Remove CRYPTO_TFM_REQ_MAY_SLEEP flag in
AES-NI accelerated ecb/cbc mode
On Mon, Jun 15, 2009 at 05:04:57PM +0800, Huang Ying wrote:
> Because AES-NI instructions will touch XMM state, corresponding code
> must be enclosed within kernel_fpu_begin/end, which used
> preempt_disable/enable. So sleep should be prevented between
> kernel_fpu_begin/end.
>
> Signed-off-by: Huang Ying <ying.huang@...el.com>
I'll apply this for now. But it would be much better to allow
sleeping in this case.
Couldn't we simply move the kernel_fpu_begin/end inside the loop?
It shouldn't be too expensive when it runs the 2nd time since it
doesn't have to save anything, right?
Cheer,
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