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>

3 files changed, 21 insertions, 0 deletions

diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
index 7c63b72ecd75..86a0d415b9a7 100644
--- a/drivers/crypto/caam/caamalg.c
+++ b/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);
diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
index e732bd962e98..ca6218eee460 100644
--- a/drivers/crypto/caam/caamhash.c
+++ b/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);
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index d1939a9539c0..588ad2288f82 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/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");