linux-kernel - [PATCH] crypto: sa2ul - Remove unused auth

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Message-ID: <20210615061452.GA5622@gondor.apana.org.au>
Date:   Tue, 15 Jun 2021 14:14:52 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     kernel test robot <lkp@...el.com>
Cc:     Peter Ujfalusi <peter.ujfalusi@...com>, kbuild-all@...ts.01.org,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: [PATCH] crypto: sa2ul - Remove unused auth_len variable

On Thu, Jun 03, 2021 at 03:53:14AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   231bc539066760aaa44d46818c85b14ca2f56d9f
> commit: 00c9211f60db2dead16856f81a3e6ab86b31f275 crypto: sa2ul - Fix DMA mapping API usage
> date:   8 months ago
> config: arm64-randconfig-r005-20210601 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d41cb6bb2607fa5c7a9df2b3dab361353657d225)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install arm64 cross compiling tool for clang build
>         # apt-get install binutils-aarch64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=00c9211f60db2dead16856f81a3e6ab86b31f275
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 00c9211f60db2dead16856f81a3e6ab86b31f275
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> drivers/crypto/sa2ul.c:1674:6: warning: variable 'auth_len' set but not used [-Wunused-but-set-variable]
>            u16 auth_len;
>                ^
>    1 warning generated.

Thanks for the report.  This variable is indeed unused.

---8<---
This patch removes the unused auth_len variable from
sa_aead_dma_in_callback.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/drivers/crypto/sa2ul.c b/drivers/crypto/sa2ul.c
index 51bb69bc573c..544d7040cfc5 100644
--- a/drivers/crypto/sa2ul.c
+++ b/drivers/crypto/sa2ul.c
@@ -1698,7 +1698,6 @@ static void sa_aead_dma_in_callback(void *data)
 	size_t pl, ml;
 	int i;
 	int err = 0;
-	u16 auth_len;
 	u32 *mdptr;
 
 	sa_sync_from_device(rxd);
@@ -1711,13 +1710,10 @@ static void sa_aead_dma_in_callback(void *data)
 	for (i = 0; i < (authsize / 4); i++)
 		mdptr[i + 4] = swab32(mdptr[i + 4]);
 
-	auth_len = req->assoclen + req->cryptlen;
-
 	if (rxd->enc) {
 		scatterwalk_map_and_copy(&mdptr[4], req->dst, start, authsize,
 					 1);
 	} else {
-		auth_len -= authsize;
 		start -= authsize;
 		scatterwalk_map_and_copy(auth_tag, req->src, start, authsize,
 					 0);
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt