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-rw-r--r--crypto/rng.c27
-rw-r--r--include/crypto/internal/rng.h9
2 files changed, 32 insertions, 4 deletions
diff --git a/crypto/rng.c b/crypto/rng.c
index 13155058b193..b81cffb13bab 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -155,14 +155,33 @@ EXPORT_SYMBOL_GPL(crypto_get_default_rng);
void crypto_put_default_rng(void)
{
mutex_lock(&crypto_default_rng_lock);
- if (!--crypto_default_rng_refcnt) {
- crypto_free_rng(crypto_default_rng);
- crypto_default_rng = NULL;
- }
+ crypto_default_rng_refcnt--;
mutex_unlock(&crypto_default_rng_lock);
}
EXPORT_SYMBOL_GPL(crypto_put_default_rng);
+#if defined(CONFIG_CRYPTO_RNG) || defined(CONFIG_CRYPTO_RNG_MODULE)
+int crypto_del_default_rng(void)
+{
+ int err = -EBUSY;
+
+ mutex_lock(&crypto_default_rng_lock);
+ if (crypto_default_rng_refcnt)
+ goto out;
+
+ crypto_free_rng(crypto_default_rng);
+ crypto_default_rng = NULL;
+
+ err = 0;
+
+out:
+ mutex_unlock(&crypto_default_rng_lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(crypto_del_default_rng);
+#endif
+
int crypto_register_rng(struct rng_alg *alg)
{
struct crypto_alg *base = &alg->base;
diff --git a/include/crypto/internal/rng.h b/include/crypto/internal/rng.h
index 263f1a5eebc7..a52ef3483dd7 100644
--- a/include/crypto/internal/rng.h
+++ b/include/crypto/internal/rng.h
@@ -22,6 +22,15 @@ void crypto_unregister_rng(struct rng_alg *alg);
int crypto_register_rngs(struct rng_alg *algs, int count);
void crypto_unregister_rngs(struct rng_alg *algs, int count);
+#if defined(CONFIG_CRYPTO_RNG) || defined(CONFIG_CRYPTO_RNG_MODULE)
+int crypto_del_default_rng(void);
+#else
+static inline int crypto_del_default_rng(void)
+{
+ return 0;
+}
+#endif
+
static inline void *crypto_rng_ctx(struct crypto_rng *tfm)
{
return crypto_tfm_ctx(&tfm->base);