linux-kernel - Re: [PATCH v5 18/19] crypto: mediatek: move to generic async completion

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Date:   Tue, 15 Aug 2017 13:13:58 +0800
From:   Ryder Lee <ryder.lee@...iatek.com>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>,
        David Howells <dhowells@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Gary Hook <gary.hook@....com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Arnaud Ebalard <arno@...isbad.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, <dm-devel@...hat.com>,
        Shaohua Li <shli@...nel.org>, Steve French <sfrench@...ba.org>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        "Jaegeuk Kim" <jaegeuk@...nel.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        "Dmitry Kasatkin" <dmitry.kasatkin@...il.com>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        <linux-crypto@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <keyrings@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-raid@...r.kernel.org>,
        <linux-cifs@...r.kernel.org>, <samba-technical@...ts.samba.org>,
        <linux-fscrypt@...r.kernel.org>,
        <linux-ima-devel@...ts.sourceforge.net>,
        <linux-ima-user@...ts.sourceforge.net>,
        <linux-security-module@...r.kernel.org>,
        Ofir Drang <ofir.drang@....com>
Subject: Re: [PATCH v5 18/19] crypto: mediatek: move to generic async
 completion

On Mon, 2017-08-14 at 18:21 +0300, Gilad Ben-Yossef wrote:
> The mediatek driver starts several async crypto ops and waits for their
> completions. Move it over to generic code doing the same.
> 
> Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
> ---

Acked-by: Ryder Lee <ryder.lee@...iatek.com>

>  drivers/crypto/mediatek/mtk-aes.c | 31 +++++--------------------------
>  1 file changed, 5 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/crypto/mediatek/mtk-aes.c b/drivers/crypto/mediatek/mtk-aes.c
> index 9e845e8..e2c7c95 100644
> --- a/drivers/crypto/mediatek/mtk-aes.c
> +++ b/drivers/crypto/mediatek/mtk-aes.c
> @@ -137,11 +137,6 @@ struct mtk_aes_gcm_ctx {
>  	struct crypto_skcipher *ctr;
>  };
>  
> -struct mtk_aes_gcm_setkey_result {
> -	int err;
> -	struct completion completion;
> -};
> -
>  struct mtk_aes_drv {
>  	struct list_head dev_list;
>  	/* Device list lock */
> @@ -936,17 +931,6 @@ static int mtk_aes_gcm_crypt(struct aead_request *req, u64 mode)
>  				    &req->base);
>  }
>  
> -static void mtk_gcm_setkey_done(struct crypto_async_request *req, int err)
> -{
> -	struct mtk_aes_gcm_setkey_result *result = req->data;
> -
> -	if (err == -EINPROGRESS)
> -		return;
> -
> -	result->err = err;
> -	complete(&result->completion);
> -}
> -
>  /*
>   * Because of the hardware limitation, we need to pre-calculate key(H)
>   * for the GHASH operation. The result of the encryption operation
> @@ -962,7 +946,7 @@ static int mtk_aes_gcm_setkey(struct crypto_aead *aead, const u8 *key,
>  		u32 hash[4];
>  		u8 iv[8];
>  
> -		struct mtk_aes_gcm_setkey_result result;
> +		struct crypto_wait wait;
>  
>  		struct scatterlist sg[1];
>  		struct skcipher_request req;
> @@ -1002,22 +986,17 @@ static int mtk_aes_gcm_setkey(struct crypto_aead *aead, const u8 *key,
>  	if (!data)
>  		return -ENOMEM;
>  
> -	init_completion(&data->result.completion);
> +	crypto_init_wait(&data->wait);
>  	sg_init_one(data->sg, &data->hash, AES_BLOCK_SIZE);
>  	skcipher_request_set_tfm(&data->req, ctr);
>  	skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
>  				      CRYPTO_TFM_REQ_MAY_BACKLOG,
> -				      mtk_gcm_setkey_done, &data->result);
> +				      crypto_req_done, &data->wait);
>  	skcipher_request_set_crypt(&data->req, data->sg, data->sg,
>  				   AES_BLOCK_SIZE, data->iv);
>  
> -	err = crypto_skcipher_encrypt(&data->req);
> -	if (err == -EINPROGRESS || err == -EBUSY) {
> -		err = wait_for_completion_interruptible(
> -			&data->result.completion);
> -		if (!err)
> -			err = data->result.err;
> -	}
> +	err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
> +			      &data->wait);
>  	if (err)
>  		goto out;
>