[PATCH v4 05/14] boot: image: try all DM hash providers

[James Hilliard <james.hilliard1@gmail.com>]

FIT hash calculation currently selects UCLASS_HASH device zero directly,
so a provider which does not implement the requested algorithm prevents a
later capable provider from being used. It also turns every provider error
into the same generic FIT hash failure.

Use the common hash provider-selection helper. Fall back to the configured
software implementation only when no DM provider supports the algorithm,
and preserve probe and digest failures from providers which accept it.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
---
Changes v3 -> v4:
  - New patch
---
 boot/image-fit.c | 26 +++++++++-----------------
 1 file changed, 9 insertions(+), 17 deletions(-)

diff --git a/boot/image-fit.c b/boot/image-fit.c
index 555cbf81348..9af38ed8d82 100644
--- a/boot/image-fit.c
+++ b/boot/image-fit.c
@@ -1322,30 +1322,22 @@ int calculate_hash(const void *data, int data_len, const char *name,
 #ifndef USE_HOSTCC
 	int rc;
 	enum HASH_ALGO hash_algo;
-	struct udevice *dev;
 
 	if (CONFIG_IS_ENABLED(DM_HASH)) {
-		rc = uclass_get_device(UCLASS_HASH, 0, &dev);
-		if (rc) {
-			debug("failed to get hash device, rc=%d\n", rc);
-			return -1;
-		}
-
 		hash_algo = hash_algo_lookup_by_name(name);
-		if (hash_algo == HASH_ALGO_INVALID) {
-			debug("Unsupported hash algorithm\n");
-			return -1;
+		if (hash_algo != HASH_ALGO_INVALID)
+			rc = hash_digest_wd_lookup(hash_algo, data, data_len,
+						   value, CHUNKSZ);
+		else
+			rc = -EOPNOTSUPP;
+		if (!rc) {
+			*value_len = hash_algo_digest_size(hash_algo);
+			return 0;
 		}
-
-		rc = hash_digest_wd(dev, hash_algo, data, data_len, value,
-				    CHUNKSZ);
-		if (rc) {
+		if (rc != -ENODEV && rc != -EOPNOTSUPP) {
 			debug("failed to get hash value, rc=%d\n", rc);
 			return -1;
 		}
-
-		*value_len = hash_algo_digest_size(hash_algo);
-		return 0;
 	}
 #endif
 

-- 
2.53.0