linux-kernel - [PATCH v2 1/3] clk: Add new function of_clk_is

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 20 Jun 2016 15:43:36 +0200
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Stephen Boyd <sboyd@...eaurora.org>,
	Michael Turquette <mturquette@...libre.com>,
	s.hauer@...gutronix.de, jeremy.kerr@...onical.com,
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH v2 1/3] clk: Add new function of_clk_is_provider()

of_clk_is_provider() checks if a device_node has already been added to
the clk provider list. This can be used to avoid adding the same clock
provider twice.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
 drivers/clk/clk.c            | 20 ++++++++++++++++++++
 include/linux/clk-provider.h |  5 +++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d584004f7af7..2423c6373906 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3120,6 +3120,26 @@ __of_clk_get_hw_from_provider(struct of_clk_provider *provider,
 	return hw;
 }
 
+/**
+ * of_clk_is_provider() - Reports if a device node is already a clk provider
+ * @np: Device node pointer under test
+ */
+bool of_clk_is_provider(struct device_node *np)
+{
+	struct of_clk_provider *cp;
+
+	mutex_lock(&of_clk_mutex);
+	list_for_each_entry(cp, &of_clk_providers, link) {
+		if (cp->node == np) {
+			mutex_unlock(&of_clk_mutex);
+			return true;
+		}
+	}
+	mutex_unlock(&of_clk_mutex);
+	return false;
+}
+EXPORT_SYMBOL_GPL(of_clk_is_provider);
+
 struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec,
 				       const char *dev_id, const char *con_id)
 {
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index fb39d5add173..a01b18797418 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -787,6 +787,7 @@ int of_clk_add_hw_provider(struct device_node *np,
 						 void *data),
 			   void *data);
 void of_clk_del_provider(struct device_node *np);
+bool of_clk_is_provider(struct device_node *np);
 struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
 				  void *data);
 struct clk_hw *of_clk_hw_simple_get(struct of_phandle_args *clkspec,
@@ -819,6 +820,10 @@ static inline int of_clk_add_hw_provider(struct device_node *np,
 	return 0;
 }
 static inline void of_clk_del_provider(struct device_node *np) {}
+static inline bool of_clk_is_provider(struct device_node *np)
+{
+	return false;
+}
 static inline struct clk *of_clk_src_simple_get(
 	struct of_phandle_args *clkspec, void *data)
 {
-- 
2.8.1