crypto: tegra - Use HMAC fallback when keyslots are full

JIRA: https://issues.redhat.com/browse/RHEL-89531
Upstream Status: linux.git

commit f80a2e2
Author: Akhil R <akhilrajeev@nvidia.com>
Date:   Mon Feb 24 14:46:10 2025 +0530

    crypto: tegra - Use HMAC fallback when keyslots are full

    The intermediate results for HMAC is stored in the allocated keyslot by
    the hardware. Dynamic allocation of keyslot during an operation is hence
    not possible. As the number of keyslots are limited in the hardware,
    fallback to the HMAC software implementation if keyslots are not available

    Fixes: 0880bb3 ("crypto: tegra - Add Tegra Security Engine driver")
    Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Herbert Xu <herbert.xu@redhat.com>

Author: Herbert Xu

drivers/crypto/tegra/tegra-se-hash.c

@@ -632,13 +632,18 @@ static int tegra_hmac_setkey(struct crypto_ahash *tfm, const u8 *key,
 			     unsigned int keylen)
 {
 	struct tegra_sha_ctx *ctx = crypto_ahash_ctx(tfm);
+	int ret;
 
 	if (aes_check_keylen(keylen))
 		return tegra_hmac_fallback_setkey(ctx, key, keylen);
 
+	ret = tegra_key_submit(ctx->se, key, keylen, ctx->alg, &ctx->key_id);
+	if (ret)
+		return tegra_hmac_fallback_setkey(ctx, key, keylen);
+
 	ctx->fallback = false;
 
-	return tegra_key_submit(ctx->se, key, keylen, ctx->alg, &ctx->key_id);
+	return 0;
 }
 
 static int tegra_sha_init(struct ahash_request *req)