linux-kernel - Re: [Outreachy kernel] [PATCH v3] Staging: ccree: Merge assignment with return

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Date:   Sat, 9 Sep 2017 08:56:03 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Srishti Sharma <srishtishar@...il.com>
cc:     gilad@...yossef.com, gregkh@...uxfoundation.org,
        linux-crypto@...r.kernel.org,
        driverdev-devel@...uxdriverproject.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH v3] Staging: ccree: Merge assignment
 with return



On Sat, 9 Sep 2017, Srishti Sharma wrote:

> Merge the assignment and return statements to return the value
> directly. Done using coccinelle.
>
> @@
> local idexpression ret;
> expression e;
> @@
>
> -ret =
> +return
>      e;
> -return ret;
>
> Signed-off-by: Srishti Sharma <srishtishar@...il.com>
> ---
> Changes in v3:
>  -Edit commit message so that it respects 80 character limit.
>  -Remove unneeded blank lines, that were added by mistake.
>
>  drivers/staging/ccree/ssi_aead.c | 14 +++-----------
>  1 file changed, 3 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/staging/ccree/ssi_aead.c b/drivers/staging/ccree/ssi_aead.c
> index 5abe6b2..1d3b580 100644
> --- a/drivers/staging/ccree/ssi_aead.c
> +++ b/drivers/staging/ccree/ssi_aead.c
> @@ -651,7 +651,6 @@ ssi_aead_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
>  static int ssi_rfc4309_ccm_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
>  {
>  	struct ssi_aead_ctx *ctx = crypto_aead_ctx(tfm);
> -	int rc = 0;
>
>  	if (keylen < 3)
>  		return -EINVAL;
> @@ -659,9 +658,7 @@ static int ssi_rfc4309_ccm_setkey(struct crypto_aead *tfm, const u8 *key, unsign
>  	keylen -= 3;
>  	memcpy(ctx->ctr_nonce, key + keylen, 3);
>
> -	rc = ssi_aead_setkey(tfm, key, keylen);
> -
> -	return rc;
> +	return ssi_aead_setkey(tfm, key, keylen);
>  }
>  #endif /*SSI_CC_HAS_AES_CCM*/
>
> @@ -2224,15 +2221,12 @@ static int ssi_rfc4106_gcm_setkey(struct crypto_aead *tfm, const u8 *key, unsign
>  	keylen -= 4;
>  	memcpy(ctx->ctr_nonce, key + keylen, 4);
>
> -	rc = ssi_aead_setkey(tfm, key, keylen);
> -
> -	return rc;
> +	return ssi_aead_setkey(tfm, key, keylen);

The declaration of rc should be dropped in this case.  You should have
gotten a compiler warning.  Always compile the code before submitting a
patch, and fix up any warnings.

julia

>  }
>
>  static int ssi_rfc4543_gcm_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
>  {
>  	struct ssi_aead_ctx *ctx = crypto_aead_ctx(tfm);
> -	int rc = 0;
>
>  	SSI_LOG_DEBUG("%s()  keylen %d, key %p\n", __func__, keylen, key);
>
> @@ -2242,9 +2236,7 @@ static int ssi_rfc4543_gcm_setkey(struct crypto_aead *tfm, const u8 *key, unsign
>  	keylen -= 4;
>  	memcpy(ctx->ctr_nonce, key + keylen, 4);
>
> -	rc = ssi_aead_setkey(tfm, key, keylen);
> -
> -	return rc;
> +	return ssi_aead_setkey(tfm, key, keylen);
>  }
>
>  static int ssi_gcm_setauthsize(struct crypto_aead *authenc,
> --
> 2.7.4
>
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