From 85ac98cbac1bb63c878486b88bfb6f5bac540e21 Mon Sep 17 00:00:00 2001
From: Tudor-Dan Ambarus <tudor.ambarus@microchip.com>
Date: Thu, 25 May 2017 10:18:11 +0300
Subject: [PATCH] crypto: qat - comply with crypto_kpp_maxsize()
Git-commit: 85ac98cbac1bb63c878486b88bfb6f5bac540e21
References: FATE#326323
Patch-mainline: v4.13

crypto_kpp_maxsize() asks for the output buffer size without
caring for errors. It allways assume that will be called after
a valid setkey. Comply with it and return what he wants.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/crypto/qat/qat_common/qat_asym_algs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/qat/qat_common/qat_asym_algs.c b/drivers/crypto/qat/qat_common/qat_asym_algs.c
index 2aab80bc241f..1d882a7cc34f 100644
--- a/drivers/crypto/qat/qat_common/qat_asym_algs.c
+++ b/drivers/crypto/qat/qat_common/qat_asym_algs.c
@@ -521,11 +521,11 @@ static int qat_dh_set_secret(struct crypto_kpp *tfm, const void *buf,
 	return 0;
 }
 
-static int qat_dh_max_size(struct crypto_kpp *tfm)
+static unsigned int qat_dh_max_size(struct crypto_kpp *tfm)
 {
 	struct qat_dh_ctx *ctx = kpp_tfm_ctx(tfm);
 
-	return ctx->p ? ctx->p_size : -EINVAL;
+	return ctx->p_size;
 }
 
 static int qat_dh_init_tfm(struct crypto_kpp *tfm)
-- 
2.16.4