[PATCH 4.9 020/139] crypto: omap-sham - fix digcnt register handling with export/import

[Greg Kroah-Hartman]

From: Tero Kristo <t-kristo@xxxxxx>

[ Upstream commit 3faf757bad75f3fc1b2736f0431e295a073a7423 ]

Running export/import for hashes in peculiar order (mostly done by
openssl) can mess up the internal book keeping of the OMAP SHA core.
Fix by forcibly writing the correct DIGCNT back to hardware. This issue
was noticed while transitioning to openssl 1.1 support.

Fixes: 0d373d603202 ("crypto: omap-sham - Add OMAP4/AM33XX SHAM Support")
Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/crypto/omap-sham.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index e7ca922a45e13..4adcf89add252 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -454,6 +454,9 @@ static void omap_sham_write_ctrl_omap4(struct omap_sham_dev *dd, size_t length,
 	struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 	u32 val, mask;
 
+	if (likely(ctx->digcnt))
+		omap_sham_write(dd, SHA_REG_DIGCNT(dd), ctx->digcnt);
+
 	/*
 	 * Setting ALGO_CONST only for the first iteration and
 	 * CLOSE_HASH only for the last one. Note that flags mode bits
-- 
2.25.1