Crypto engine BAM dma does not support 0 length data. Return unsupported if zero length messages are passed for transformation. Signed-off-by: Thara Gopinath <thara.gopinath@xxxxxxxxxx> --- v5->v6: - Return 0 for zero length messages instead of -EOPNOTSUPP in the cipher algorithms as pointed out by Eric Biggers. drivers/crypto/qce/skcipher.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c index de1f37ed4ee6..96af40c2c8f3 100644 --- a/drivers/crypto/qce/skcipher.c +++ b/drivers/crypto/qce/skcipher.c @@ -8,6 +8,7 @@ #include <linux/interrupt.h> #include <linux/moduleparam.h> #include <linux/types.h> +#include <linux/errno.h> #include <crypto/aes.h> #include <crypto/internal/des.h> #include <crypto/internal/skcipher.h> @@ -260,6 +261,10 @@ static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt) rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT; keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen; + /* CE does not handle 0 length messages */ + if (!req->cryptlen) + return 0; + /* qce is hanging when AES-XTS request len > QCE_SECTOR_SIZE and * is not a multiple of it; pass such requests to the fallback */ -- 2.25.1
