crypto: caam - fix hash, alg and rng registration if CAAM driver not initialized

If the CAAM driver initialization failed (due to various reasons, e.g. RNG4
initialization failed), then the registration of hash/algorithms/rng shouldn't
take place. This patch adds the necessary code to prevent this registration.
Signed-off-by: Alex Porosanu <alexandru.porosanu@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/caamalg.c

@@ -2209,6 +2209,13 @@ static int __init caam_algapi_init(void)
 	priv = dev_get_drvdata(ctrldev);
 	of_node_put(dev_node);
 
+	/*
+	 * If priv is NULL, it's probably because the caam driver wasn't
+	 * properly initialized (e.g. RNG4 init failed). Thus, bail out here.
+	 */
+	if (!priv)
+		return -ENODEV;
+
 	INIT_LIST_HEAD(&priv->alg_list);
 
 	atomic_set(&priv->tfm_count, -1);

drivers/crypto/caam/caamhash.c

@@ -1833,6 +1833,13 @@ static int __init caam_algapi_hash_init(void)
 	priv = dev_get_drvdata(ctrldev);
 	of_node_put(dev_node);
 
+	/*
+	 * If priv is NULL, it's probably because the caam driver wasn't
+	 * properly initialized (e.g. RNG4 init failed). Thus, bail out here.
+	 */
+	if (!priv)
+		return -ENODEV;
+
 	INIT_LIST_HEAD(&priv->hash_list);
 
 	atomic_set(&priv->tfm_count, -1);

drivers/crypto/caam/caamrng.c

@@ -298,6 +298,13 @@ static int __init caam_rng_init(void)
 	priv = dev_get_drvdata(ctrldev);
 	of_node_put(dev_node);
 
+	/*
+	 * If priv is NULL, it's probably because the caam driver wasn't
+	 * properly initialized (e.g. RNG4 init failed). Thus, bail out here.
+	 */
+	if (!priv)
+		return -ENODEV;
+
 	caam_init_rng(&rng_ctx, priv->jrdev[0]);
 
 	dev_info(priv->jrdev[0], "registering rng-caam\n");