openwrtv4/target/linux/mxs/patches-4.4/110-crypto-mxsdcp-provide-importexport.patch

From: Fabio Estevam <fabio.estevam@nxp.com>

Currently the mxs-dcp driver fails to probe:

mxs-dcp 80028000.dcp: Failed to register sha1 hash!
mxs-dcp: probe of 80028000.dcp failed with error -22

This happens since commit 8996eafdcbad ("crypto: ahash - ensure statesize
is non-zero"), which requires statesize to be filled.

Other than filling statesize, we also need to provide the import/export
functions.

Based on the implementation of the sahara and caam drivers.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
---
Changes since v2:
- Newly introduced in this series

 drivers/crypto/mxs-dcp.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

--- a/drivers/crypto/mxs-dcp.c
+++ b/drivers/crypto/mxs-dcp.c
@@ -775,6 +775,24 @@ static void dcp_sha_cra_exit(struct cryp
 {
 }
 
+static int dcp_sha_export(struct ahash_request *req, void *out)
+{
+	struct dcp_sha_req_ctx *rctx = ahash_request_ctx(req);
+
+	memcpy(out, rctx, sizeof(struct dcp_sha_req_ctx));
+
+	return 0;
+}
+
+static int dcp_sha_import(struct ahash_request *req, const void *in)
+{
+	struct dcp_sha_req_ctx *rctx = ahash_request_ctx(req);
+
+	memcpy(rctx, in, sizeof(struct dcp_sha_req_ctx));
+
+	return 0;
+}
+
 /* AES 128 ECB and AES 128 CBC */
 static struct crypto_alg dcp_aes_algs[] = {
 	{
@@ -834,8 +852,11 @@ static struct ahash_alg dcp_sha1_alg = {
 	.final	= dcp_sha_final,
 	.finup	= dcp_sha_finup,
 	.digest	= dcp_sha_digest,
+	.import = dcp_sha_import,
+	.export = dcp_sha_export,
 	.halg	= {
 		.digestsize	= SHA1_DIGEST_SIZE,
+		.statesize	= sizeof(struct dcp_sha_req_ctx),
 		.base		= {
 			.cra_name		= "sha1",
 			.cra_driver_name	= "sha1-dcp",
@@ -858,8 +879,11 @@ static struct ahash_alg dcp_sha256_alg =
 	.final	= dcp_sha_final,
 	.finup	= dcp_sha_finup,
 	.digest	= dcp_sha_digest,
+	.import = dcp_sha_import,
+	.export = dcp_sha_export,
 	.halg	= {
 		.digestsize	= SHA256_DIGEST_SIZE,
+		.statesize	= sizeof(struct dcp_sha_req_ctx),
 		.base		= {
 			.cra_name		= "sha256",
 			.cra_driver_name	= "sha256-dcp",