[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 <redacted>

All warnings (new ones prefixed by >>):

quoted

quoted

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 <redacted>
Signed-off-by: Herbert Xu <herbert@gondor.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@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt