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.gopin...@linaro.org>
---
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 8aeb741ca5a3..6b3dc3a9797c 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
