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crypto: omap-sham - fix digcnt register handling with export/import

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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: 0d373d6032 ("crypto: omap-sham - Add OMAP4/AM33XX SHAM Support")
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tero Kristo 2020-09-07 10:56:24 +03:00 committed by Herbert Xu
parent 133c3d434d
commit 3faf757bad
1 changed files with 3 additions and 0 deletions
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3
drivers/crypto/omap-sham.c
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@ -460,6 +460,9 @@ 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