[PATCH] crypto: brcm - software fallback for cryptlen zero

[Raveendra Padasalagi]

Zero length payload requests are not handled in
Broadcom SPU2 engine, so this patch adds conditional
check to fallback to software implementation for AES-GCM
and AES-CCM algorithms.

Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi@xxxxxxxxxxxx>
Reviewed-by: Ray Jui <ray.jui@xxxxxxxxxxxx>
Reviewed-by: Scott Branden <scott.branden@xxxxxxxxxxxx>
---
 drivers/crypto/bcm/cipher.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/bcm/cipher.c b/drivers/crypto/bcm/cipher.c
index cc0d5b9..6c80863 100644
--- a/drivers/crypto/bcm/cipher.c
+++ b/drivers/crypto/bcm/cipher.c
@@ -2625,7 +2625,7 @@ static int aead_need_fallback(struct aead_request *req)
 	 */
 	if (((ctx->cipher.mode == CIPHER_MODE_GCM) ||
 	     (ctx->cipher.mode == CIPHER_MODE_CCM)) &&
-	    (req->assoclen == 0)) {
+	    ((req->assoclen == 0) || (req->cryptlen == 0))) {
 		if ((rctx->is_encrypt && (req->cryptlen == 0)) ||
 		    (!rctx->is_encrypt && (req->cryptlen == ctx->digestsize))) {
 			flow_log("AES GCM/CCM needs fallback for 0 len req\n");
-- 
1.9.1