diff --git a/common/globalvar.c b/common/globalvar.c
index a826e1b..c87f2c9 100644
--- a/common/globalvar.c
+++ b/common/globalvar.c
@@ -175,21 +175,24 @@
 	return 1;
 }
 
-static int nv_set(struct device_d *dev, struct param_d *p, const char *val)
+static int nv_set(struct device_d *dev, struct param_d *p, const char *name, const char *val)
 {
 	int ret;
 
 	if (!val) {
-		free(p->value);
+		if (p)
+			free(p->value);
 		return 0;
 	}
 
-	ret = dev_set_param(&global_device, p->name, val);
+	ret = dev_set_param(&global_device, name, val);
 	if (ret)
 		return ret;
 
-	free(p->value);
-	p->value = xstrdup(val);
+	if (p) {
+		free(p->value);
+		p->value = xstrdup(val);
+	}
 
 	return 0;
 }
@@ -203,7 +206,7 @@
 {
 	int ret;
 
-	ret = nv_set(dev, p, val);
+	ret = nv_set(dev, p, p->name, val);
 	if (ret)
 		return ret;
 
@@ -234,7 +237,7 @@
 		return ret;
 
 	if (value)
-		return nv_set(&nv_device, p, value);
+		return nv_set(&nv_device, p, name, value);
 
 	ret = nvvar_device_dispatch(name, &dev, &pname);
 	if (ret > 0)
@@ -242,7 +245,7 @@
 	else
 		value = dev_get_param(&global_device, name);
 
-	if (value) {
+	if (value && p) {
 		free(p->value);
 		p->value = xstrdup(value);
 	}
diff --git a/common/state/state.h b/common/state/state.h
index 912d6d4..1881d92 100644
--- a/common/state/state.h
+++ b/common/state/state.h
@@ -159,7 +159,6 @@
  */
 struct state_uint32 {
 	struct state_variable var;
-	struct param_d *param;
 	uint32_t value;
 	uint32_t value_default;
 };
@@ -169,7 +168,6 @@
  */
 struct state_enum32 {
 	struct state_variable var;
-	struct param_d *param;
 	uint32_t value;
 	uint32_t value_default;
 	const char **names;
@@ -181,7 +179,6 @@
  */
 struct state_mac {
 	struct state_variable var;
-	struct param_d *param;
 	uint8_t value[6];
 	uint8_t value_default[6];
 };
@@ -191,7 +188,6 @@
  */
 struct state_string {
 	struct state_variable var;
-	struct param_d *param;
 	char *value;
 	const char *value_default;
 	char raw[];
diff --git a/common/state/state_variables.c b/common/state/state_variables.c
index 6a00c82..66c66f3 100644
--- a/common/state/state_variables.c
+++ b/common/state/state_variables.c
@@ -116,7 +116,6 @@
 		return ERR_CAST(param);
 	}
 
-	su32->param = param;
 	su32->var.type = vtype;
 	su32->var.size = sizeof(uint8_t);
 #ifdef __LITTLE_ENDIAN
@@ -146,7 +145,6 @@
 		return ERR_CAST(param);
 	}
 
-	su32->param = param;
 	su32->var.type = vtype;
 	su32->var.size = sizeof(uint32_t);
 	su32->var.raw = &su32->value;
@@ -226,6 +224,7 @@
 						  const struct variable_type *vtype)
 {
 	struct state_enum32 *enum32;
+	struct param_d *param;
 	int ret, i, num_names;
 
 	enum32 = xzalloc(sizeof(*enum32));
@@ -253,11 +252,11 @@
 		enum32->names[i] = xstrdup(name);
 	}
 
-	enum32->param = dev_add_param_enum(&state->dev, name, state_set_dirty,
+	param = dev_add_param_enum(&state->dev, name, state_set_dirty,
 					   NULL, &enum32->value, enum32->names,
 					   num_names, &enum32->var);
-	if (IS_ERR(enum32->param)) {
-		ret = PTR_ERR(enum32->param);
+	if (IS_ERR(param)) {
+		ret = PTR_ERR(param);
 		goto out;
 	}
 
@@ -310,6 +309,7 @@
 					       const struct variable_type *vtype)
 {
 	struct state_mac *mac;
+	struct param_d *param;
 	int ret;
 
 	mac = xzalloc(sizeof(*mac));
@@ -319,10 +319,10 @@
 	mac->var.raw = mac->value;
 	mac->var.state = state;
 
-	mac->param = dev_add_param_mac(&state->dev, name, state_set_dirty,
+	param = dev_add_param_mac(&state->dev, name, state_set_dirty,
 				       NULL, mac->value, &mac->var);
-	if (IS_ERR(mac->param)) {
-		ret = PTR_ERR(mac->param);
+	if (IS_ERR(param)) {
+		ret = PTR_ERR(param);
 		goto out;
 	}
 
@@ -413,6 +413,7 @@
 {
 	struct state_string *string;
 	uint32_t start_size[2];
+	struct param_d *param;
 	int ret;
 
 	ret = of_property_read_u32_array(node, "reg", start_size,
@@ -432,11 +433,11 @@
 	string->var.raw = &string->raw;
 	string->var.state = state;
 
-	string->param = dev_add_param_string(&state->dev, name,
+	param = dev_add_param_string(&state->dev, name,
 					     state_string_set, state_string_get,
 					     &string->value, &string->var);
-	if (IS_ERR(string->param)) {
-		ret = PTR_ERR(string->param);
+	if (IS_ERR(param)) {
+		ret = PTR_ERR(param);
 		goto out;
 	}
 
diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index e5b5e8a..34aaee5 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -1822,6 +1822,7 @@
 int mci_register(struct mci_host *host)
 {
 	struct mci *mci;
+	struct param_d *param_probe;
 	int ret;
 
 	mci = xzalloc(sizeof(*mci));
@@ -1853,11 +1854,11 @@
 
 	dev_info(mci->host->hw_dev, "registered as %s\n", dev_name(&mci->dev));
 
-	mci->param_probe = dev_add_param_bool(&mci->dev, "probe",
+	param_probe = dev_add_param_bool(&mci->dev, "probe",
 			mci_set_probe, NULL, &mci->probe, mci);
 
-	if (IS_ERR(mci->param_probe) && PTR_ERR(mci->param_probe) != -ENOSYS) {
-		ret = PTR_ERR(mci->param_probe);
+	if (IS_ERR(param_probe) && PTR_ERR(param_probe) != -ENOSYS) {
+		ret = PTR_ERR(param_probe);
 		dev_dbg(&mci->dev, "Failed to add 'probe' parameter to the MCI device\n");
 		goto err_unregister;
 	}
diff --git a/include/mci.h b/include/mci.h
index 57a4629..d967027 100644
--- a/include/mci.h
+++ b/include/mci.h
@@ -471,7 +471,6 @@
 	int dsr_imp;		/**< DSR implementation state from CSD */
 	char *ext_csd;
 	int probe;
-	struct param_d *param_probe;
 	struct param_d *param_boot;
 	int bootpart;
 
diff --git a/include/param.h b/include/param.h
index f1166eb..c79b908 100644
--- a/include/param.h
+++ b/include/param.h
@@ -118,7 +118,7 @@
 		const char *(*get)(struct device_d *, struct param_d *p),
 		unsigned long flags)
 {
-	return ERR_PTR(-ENOSYS);
+	return NULL;
 }
 
 static inline struct param_d *dev_add_param_string(struct device_d *dev, const char *name,
@@ -126,7 +126,7 @@
 		int (*get)(struct param_d *p, void *priv),
 		char **value, void *priv)
 {
-	return ERR_PTR(-ENOSYS);
+	return NULL;
 }
 
 static inline struct param_d *__dev_add_param_int(struct device_d *dev, const char *name,
@@ -134,7 +134,7 @@
 		int (*get)(struct param_d *p, void *priv),
 		void *value, enum param_type type, const char *format, void *priv)
 {
-	return ERR_PTR(-ENOSYS);
+	return NULL;
 }
 
 static inline struct param_d *dev_add_param_enum(struct device_d *dev, const char *name,
@@ -143,7 +143,7 @@
 		int *value, const char * const *names, int max, void *priv)
 
 {
-	return ERR_PTR(-ENOSYS);
+	return NULL;
 }
 
 static inline struct param_d *dev_add_param_bitmask(struct device_d *dev, const char *name,
@@ -151,7 +151,7 @@
                 int (*get)(struct param_d *p, void *priv),
                 unsigned long *value, const char * const *names, int max, void *priv)
 {
-	return ERR_PTR(-ENOSYS);
+	return NULL;
 }
 
 static inline struct param_d *dev_add_param_tristate(struct device_d *dev, const char *name,
@@ -159,13 +159,13 @@
 		int (*get)(struct param_d *p, void *priv),
 		int *value, void *priv)
 {
-	return ERR_PTR(-ENOSYS);
+	return NULL;
 }
 
 static inline struct param_d *dev_add_param_tristate_ro(struct device_d *dev, const char *name,
 		int *value)
 {
-	return ERR_PTR(-ENOSYS);
+	return NULL;
 }
 
 static inline struct param_d *dev_add_param_ip(struct device_d *dev, const char *name,
@@ -173,7 +173,7 @@
 		int (*get)(struct param_d *p, void *priv),
 		IPaddr_t *ip, void *priv)
 {
-	return ERR_PTR(-ENOSYS);
+	return NULL;
 }
 
 static inline struct param_d *dev_add_param_mac(struct device_d *dev, const char *name,
@@ -181,13 +181,13 @@
 		int (*get)(struct param_d *p, void *priv),
 		u8 *mac, void *priv)
 {
-	return ERR_PTR(-ENOSYS);
+	return NULL;
 }
 
 static inline struct param_d *dev_add_param_fixed(struct device_d *dev, const char *name,
 						  const char *value)
 {
-	return ERR_PTR(-ENOSYS);
+	return NULL;
 }
 
 static inline void dev_remove_param(struct param_d *p) {}