From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Biggers <ebiggers@kernel.org>
Subject: Re: [Question] Confusion of the meaning for encrypto
 API's return value
Date: Mon, 16 Dec 2019 09:32:17 -0800
Message-ID: <20191216173217.GD139479@gmail.com>
References: <7a4edfcb-c140-bf1b-c674-dbb1b30f9b07@huawei.com>
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To: Xu Zaibo <xuzaibo@huawei.com>
Cc: forest.zhouchang@huawei.com, dm-devel@redhat.com, linux-crypto@vger.kernel.org, zhangwei375@huawei.com
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On Mon, Dec 16, 2019 at 03:18:54PM +0800, Xu Zaibo wrote:
> Hi,
> 
> I get a confusion.
> 
> According to my understanding, That 'crypto_skcipher_encrypt(request)'
> returns '-EBUSY '
> 
> means the caller should call this API again with the request. However, as my
> knowledge in
> 
> 'dm-crypt', this means the caller need not call this request again, because
> 'dm-crypt' thinks
> 
> that the driver of 'crypto_skcipher_encrypt' will send the request again as
> it is not busy.
> 
>    So, my question is: what's the meaning of
> 'crypto_skcipher_encrypt(request)' returning '-EBUSY '?
> 
> 
> Cheers,
> 

-EBUSY means that the request was put on the backlog.  It will still be
completed eventually.

- Eric