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Date:	Sat, 24 Aug 2013 17:19:46 +0200
From:	Sylwester Nawrocki <>
Subject: [PATCH v4 2/5] clkdev: Fix race condition in clock lookup from device tree

There is currently a race condition in the device tree part of clk_get()
function, since the pointer returned from of_clk_get_by_name() may become
invalid before __clk_get() call. E.g. due to the clock provider driver
remove() callback being called in between of_clk_get_by_name() and

Fix this by doing both the look up and __clk_get() operations with the
clock providers list mutex held. This ensures that the clock pointer
returned from __of_clk_get_from_provider() call and passed to __clk_get()
is valid, as long as the clock supplier module first removes its clock
provider instance and then does clk_unregister() on the corresponding

Signed-off-by: Sylwester Nawrocki <>
Signed-off-by: Kyungmin Park <>
Reviewed-by: Mike Turquette <>
Acked-by: Russell King <>

Changes since v2:
 - none.

Changes since v1:
 - include "clk.h".
 drivers/clk/clkdev.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 442a313..48f6721 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -21,6 +21,8 @@
 #include <linux/clkdev.h>
 #include <linux/of.h>
+#include "clk.h"
 static LIST_HEAD(clocks);
 static DEFINE_MUTEX(clocks_mutex);
@@ -39,7 +41,13 @@ struct clk *of_clk_get(struct device_node *np, int index)
 	if (rc)
 		return ERR_PTR(rc);
-	clk = of_clk_get_from_provider(&clkspec);
+	of_clk_lock();
+	clk = __of_clk_get_from_provider(&clkspec);
+	if (!IS_ERR(clk) && !__clk_get(clk))
+		clk = ERR_PTR(-ENOENT);
+	of_clk_unlock();
 	return clk;
@@ -157,7 +165,7 @@ struct clk *clk_get(struct device *dev, const char *con_id)
 	if (dev) {
 		clk = of_clk_get_by_name(dev->of_node, con_id);
-		if (!IS_ERR(clk) && __clk_get(clk))
+		if (!IS_ERR(clk))
 			return clk;

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