interconnect: fix provider registration API

commit 2e51db0603ea3313752752be9253392b7e669c33 upstream.

The current interconnect provider interface is inherently racy as
providers are expected to be added before being fully initialised.

Specifically, nodes are currently not added and the provider data is not
initialised until after registering the provider which can cause racing
DT lookups to fail.

Add a new provider API which will be used to fix up the interconnect
drivers.

The old API is reimplemented using the new interface and will be removed
once all drivers have been fixed.

Fixes: 011f637d6b07 ("interconnect: Add generic on-chip interconnect API")
Fixes: 153736a0195c ("interconnect: Allow endpoints translation via DT")
Cc: stable@vger.kernel.org      # 5.1
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # i.MX8MP MSC SM2-MB-EP1 Board
Link: https://lore.kernel.org/r/20230306075651.2449-4-johan+linaro@kernel.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index fe81b401953f73492b1dbbba843e0d2eaee831bc..1e814d382d4a64f51bf82dc9fb8785631d726b92 100644 (file)
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -1029,44 +1029,68 @@ int icc_nodes_remove(struct icc_provider *provider)
 EXPORT_SYMBOL_GPL(icc_nodes_remove);
 
 /**
- * icc_provider_add() - add a new interconnect provider
- * @provider: the interconnect provider that will be added into topology
+ * icc_provider_init() - initialize a new interconnect provider
+ * @provider: the interconnect provider to initialize
+ *
+ * Must be called before adding nodes to the provider.
+ */
+void icc_provider_init(struct icc_provider *provider)
+{
+       WARN_ON(!provider->set);
+
+       INIT_LIST_HEAD(&provider->nodes);
+}
+EXPORT_SYMBOL_GPL(icc_provider_init);
+
+/**
+ * icc_provider_register() - register a new interconnect provider
+ * @provider: the interconnect provider to register
  *
  * Return: 0 on success, or an error code otherwise
  */
-int icc_provider_add(struct icc_provider *provider)
+int icc_provider_register(struct icc_provider *provider)
 {
-       if (WARN_ON(!provider->set))
-               return -EINVAL;
        if (WARN_ON(!provider->xlate && !provider->xlate_extended))
                return -EINVAL;
 
        mutex_lock(&icc_lock);
-
-       INIT_LIST_HEAD(&provider->nodes);
        list_add_tail(&provider->provider_list, &icc_providers);
-
        mutex_unlock(&icc_lock);
 
-       dev_dbg(provider->dev, "interconnect provider added to topology\n");
+       dev_dbg(provider->dev, "interconnect provider registered\n");
 
        return 0;
 }
-EXPORT_SYMBOL_GPL(icc_provider_add);
+EXPORT_SYMBOL_GPL(icc_provider_register);
 
 /**
- * icc_provider_del() - delete previously added interconnect provider
- * @provider: the interconnect provider that will be removed from topology
+ * icc_provider_deregister() - deregister an interconnect provider
+ * @provider: the interconnect provider to deregister
  */
-void icc_provider_del(struct icc_provider *provider)
+void icc_provider_deregister(struct icc_provider *provider)
 {
        mutex_lock(&icc_lock);
        WARN_ON(provider->users);
-       WARN_ON(!list_empty(&provider->nodes));
 
        list_del(&provider->provider_list);
        mutex_unlock(&icc_lock);
 }
+EXPORT_SYMBOL_GPL(icc_provider_deregister);
+
+int icc_provider_add(struct icc_provider *provider)
+{
+       icc_provider_init(provider);
+
+       return icc_provider_register(provider);
+}
+EXPORT_SYMBOL_GPL(icc_provider_add);
+
+void icc_provider_del(struct icc_provider *provider)
+{
+       WARN_ON(!list_empty(&provider->nodes));
+
+       icc_provider_deregister(provider);
+}
 EXPORT_SYMBOL_GPL(icc_provider_del);
 
 static int of_count_icc_providers(struct device_node *np)

diff --git a/include/linux/interconnect-provider.h b/include/linux/interconnect-provider.h
index cd5c5a27557f5605b78eed7531b58124b114fbd6..d12cd18aab3f49448a49f46c0e56689329c234e3 100644 (file)
--- a/include/linux/interconnect-provider.h
+++ b/include/linux/interconnect-provider.h
@@ -122,6 +122,9 @@ int icc_link_destroy(struct icc_node *src, struct icc_node *dst);
 void icc_node_add(struct icc_node *node, struct icc_provider *provider);
 void icc_node_del(struct icc_node *node);
 int icc_nodes_remove(struct icc_provider *provider);
+void icc_provider_init(struct icc_provider *provider);
+int icc_provider_register(struct icc_provider *provider);
+void icc_provider_deregister(struct icc_provider *provider);
 int icc_provider_add(struct icc_provider *provider);
 void icc_provider_del(struct icc_provider *provider);
 struct icc_node_data *of_icc_get_from_provider(struct of_phandle_args *spec);
@@ -167,6 +170,15 @@ static inline int icc_nodes_remove(struct icc_provider *provider)
        return -ENOTSUPP;
 }
 
+static inline void icc_provider_init(struct icc_provider *provider) { }
+
+static inline int icc_provider_register(struct icc_provider *provider)
+{
+       return -ENOTSUPP;
+}
+
+static inline void icc_provider_deregister(struct icc_provider *provider) { }
+
 static inline int icc_provider_add(struct icc_provider *provider)
 {
        return -ENOTSUPP;