Hi Andrei, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on cryptodev/master] [also build test WARNING on crypto/master next-20200807] [cannot apply to powerpc/next sparc-next/master v5.8] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Andrei-Botila/crypto-add-check-f... base: https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master config: arm-defconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/crypto/atmel-aes.c: In function 'atmel_aes_crypt': 1111 | if (!req->cryptlen) | ^ drivers/crypto/atmel-aes.c:1114:2: note: here 1114 | default: | ^~~~~~~ vim +1111 drivers/crypto/atmel-aes.c 1085 1086 static int atmel_aes_crypt(struct skcipher_request *req, unsigned long mode) 1087 { 1088 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 1089 struct atmel_aes_base_ctx *ctx = crypto_skcipher_ctx(skcipher); 1090 struct atmel_aes_reqctx *rctx; 1091 struct atmel_aes_dev *dd; 1092 1093 switch (mode & AES_FLAGS_OPMODE_MASK) { 1094 case AES_FLAGS_CFB8: 1095 ctx->block_size = CFB8_BLOCK_SIZE; 1096 break; 1097 1098 case AES_FLAGS_CFB16: 1099 ctx->block_size = CFB16_BLOCK_SIZE; 1100 break; 1101 1102 case AES_FLAGS_CFB32: 1103 ctx->block_size = CFB32_BLOCK_SIZE; 1104 break; 1105 1106 case AES_FLAGS_CFB64: 1107 ctx->block_size = CFB64_BLOCK_SIZE; 1108 break; 1109 1110 case AES_FLAGS_XTS: 1112 return 0; 1113 1114 default: 1115 ctx->block_size = AES_BLOCK_SIZE; 1116 break; 1117 } 1118 ctx->is_aead = false; 1119 1120 dd = atmel_aes_find_dev(ctx); 1121 if (!dd) 1122 return -ENODEV; 1123 1124 rctx = skcipher_request_ctx(req); 1125 rctx->mode = mode; 1126 1127 if ((mode & AES_FLAGS_OPMODE_MASK) != AES_FLAGS_ECB && 1128 !(mode & AES_FLAGS_ENCRYPT) && req->src == req->dst) { 1129 unsigned int ivsize = crypto_skcipher_ivsize(skcipher); 1130 1131 if (req->cryptlen >= ivsize) 1132 scatterwalk_map_and_copy(rctx->lastc, req->src, 1133 req->cryptlen - ivsize, 1134 ivsize, 0); 1135 } 1136 1137 return atmel_aes_handle_queue(dd, &req->base); 1138 } 1139 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org