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Date:   Thu, 9 Jul 2020 15:36:19 +1000
From:   Herbert Xu <herbert@gondor.apana.org.au>
To:     Yang Shen <shenyang39@huawei.com>
Cc:     davem@davemloft.net, linux-crypto@vger.kernel.org,
        xuzaibo@huawei.com, wangzhou1@hisilicon.com
Subject: Re: [Patch v2 8/9] crypto: hisilicon/qm - fix the process of
 register algorithms to crypto
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On Wed, Jul 01, 2020 at 03:19:54PM +0800, Yang Shen wrote:
> When the devices are removed or not existing, the corresponding algorithms
> which are registered by 'hisi-zip' driver can't be used.
> 
> Move 'hisi_zip_register_to_crypto' from 'hisi_zip_init' to
> 'hisi_zip_probe'. The algorithms will be registered to crypto only when
> there is device bind on the driver. And when the devices are removed,
> the algorithms will be unregistered.

You can't just unregister a live algorithm because if someone
holds a reference count on it then the Crypto API will crash.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt