This is a note to let you know that I've just added the patch titled
clk: fixed-rate: add devm_clk_hw_register_fixed_rate
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
clk-fixed-rate-add-devm_clk_hw_register_fixed_rate.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6cd9edd71abde2b142e8016afe59973a6743b7f2
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date: Fri Sep 16 09:17:39 2022 +0300
clk: fixed-rate: add devm_clk_hw_register_fixed_rate
[ Upstream commit 1d7d20658534c7d36fe6f4252f6f1a27d9631a99 ]
Add devm_clk_hw_register_fixed_rate(), devres-managed helper to register
fixed-rate clock.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220916061740.87167-3-dmitry.baryshkov@xxxxxxxxxx
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
Stable-dep-of: ee0cf5e07f44 ("clk: fixed-rate: fix clk_hw_register_fixed_rate_with_accuracy_parent_hw")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c
index 45501637705c..62e994d18fe2 100644
--- a/drivers/clk/clk-fixed-rate.c
+++ b/drivers/clk/clk-fixed-rate.c
@@ -49,12 +49,24 @@ const struct clk_ops clk_fixed_rate_ops = {
};
EXPORT_SYMBOL_GPL(clk_fixed_rate_ops);
+static void devm_clk_hw_register_fixed_rate_release(struct device *dev, void *res)
+{
+ struct clk_fixed_rate *fix = res;
+
+ /*
+ * We can not use clk_hw_unregister_fixed_rate, since it will kfree()
+ * the hw, resulting in double free. Just unregister the hw and let
+ * devres code kfree() it.
+ */
+ clk_hw_unregister(&fix->hw);
+}
+
struct clk_hw *__clk_hw_register_fixed_rate(struct device *dev,
struct device_node *np, const char *name,
const char *parent_name, const struct clk_hw *parent_hw,
const struct clk_parent_data *parent_data, unsigned long flags,
unsigned long fixed_rate, unsigned long fixed_accuracy,
- unsigned long clk_fixed_flags)
+ unsigned long clk_fixed_flags, bool devm)
{
struct clk_fixed_rate *fixed;
struct clk_hw *hw;
@@ -62,7 +74,11 @@ struct clk_hw *__clk_hw_register_fixed_rate(struct device *dev,
int ret = -EINVAL;
/* allocate fixed-rate clock */
- fixed = kzalloc(sizeof(*fixed), GFP_KERNEL);
+ if (devm)
+ fixed = devres_alloc(devm_clk_hw_register_fixed_rate_release,
+ sizeof(*fixed), GFP_KERNEL);
+ else
+ fixed = kzalloc(sizeof(*fixed), GFP_KERNEL);
if (!fixed)
return ERR_PTR(-ENOMEM);
@@ -90,9 +106,13 @@ struct clk_hw *__clk_hw_register_fixed_rate(struct device *dev,
else if (np)
ret = of_clk_hw_register(np, hw);
if (ret) {
- kfree(fixed);
+ if (devm)
+ devres_free(fixed);
+ else
+ kfree(fixed);
hw = ERR_PTR(ret);
- }
+ } else if (devm)
+ devres_add(dev, fixed);
return hw;
}
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index aa8cbf882914..76f02b214f39 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -350,7 +350,7 @@ struct clk_hw *__clk_hw_register_fixed_rate(struct device *dev,
const char *parent_name, const struct clk_hw *parent_hw,
const struct clk_parent_data *parent_data, unsigned long flags,
unsigned long fixed_rate, unsigned long fixed_accuracy,
- unsigned long clk_fixed_flags);
+ unsigned long clk_fixed_flags, bool devm);
struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
const char *parent_name, unsigned long flags,
unsigned long fixed_rate);
@@ -365,7 +365,20 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
*/
#define clk_hw_register_fixed_rate(dev, name, parent_name, flags, fixed_rate) \
__clk_hw_register_fixed_rate((dev), NULL, (name), (parent_name), NULL, \
- NULL, (flags), (fixed_rate), 0, 0)
+ NULL, (flags), (fixed_rate), 0, 0, false)
+
+/**
+ * devm_clk_hw_register_fixed_rate - register fixed-rate clock with the clock
+ * framework
+ * @dev: device that is registering this clock
+ * @name: name of this clock
+ * @parent_name: name of clock's parent
+ * @flags: framework-specific flags
+ * @fixed_rate: non-adjustable clock rate
+ */
+#define devm_clk_hw_register_fixed_rate(dev, name, parent_name, flags, fixed_rate) \
+ __clk_hw_register_fixed_rate((dev), NULL, (name), (parent_name), NULL, \
+ NULL, (flags), (fixed_rate), 0, 0, true)
/**
* clk_hw_register_fixed_rate_parent_hw - register fixed-rate clock with
* the clock framework
@@ -378,7 +391,7 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
#define clk_hw_register_fixed_rate_parent_hw(dev, name, parent_hw, flags, \
fixed_rate) \
__clk_hw_register_fixed_rate((dev), NULL, (name), NULL, (parent_hw), \
- NULL, (flags), (fixed_rate), 0, 0)
+ NULL, (flags), (fixed_rate), 0, 0, false)
/**
* clk_hw_register_fixed_rate_parent_data - register fixed-rate clock with
* the clock framework
@@ -392,7 +405,7 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
fixed_rate) \
__clk_hw_register_fixed_rate((dev), NULL, (name), NULL, NULL, \
(parent_data), (flags), (fixed_rate), 0, \
- 0)
+ 0, false)
/**
* clk_hw_register_fixed_rate_with_accuracy - register fixed-rate clock with
* the clock framework
@@ -408,7 +421,7 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
fixed_accuracy) \
__clk_hw_register_fixed_rate((dev), NULL, (name), (parent_name), \
NULL, NULL, (flags), (fixed_rate), \
- (fixed_accuracy), 0)
+ (fixed_accuracy), 0, false)
/**
* clk_hw_register_fixed_rate_with_accuracy_parent_hw - register fixed-rate
* clock with the clock framework
@@ -423,7 +436,7 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
parent_hw, flags, fixed_rate, fixed_accuracy) \
__clk_hw_register_fixed_rate((dev), NULL, (name), NULL, (parent_hw) \
NULL, NULL, (flags), (fixed_rate), \
- (fixed_accuracy), 0)
+ (fixed_accuracy), 0, false)
/**
* clk_hw_register_fixed_rate_with_accuracy_parent_data - register fixed-rate
* clock with the clock framework
@@ -438,7 +451,7 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
parent_data, flags, fixed_rate, fixed_accuracy) \
__clk_hw_register_fixed_rate((dev), NULL, (name), NULL, NULL, \
(parent_data), NULL, (flags), \
- (fixed_rate), (fixed_accuracy), 0)
+ (fixed_rate), (fixed_accuracy), 0, false)
/**
* clk_hw_register_fixed_rate_parent_accuracy - register fixed-rate clock with
* the clock framework
@@ -452,7 +465,7 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
flags, fixed_rate) \
__clk_hw_register_fixed_rate((dev), NULL, (name), NULL, NULL, \
(parent_data), (flags), (fixed_rate), 0, \
- CLK_FIXED_RATE_PARENT_ACCURACY)
+ CLK_FIXED_RATE_PARENT_ACCURACY, false)
void clk_unregister_fixed_rate(struct clk *clk);
void clk_hw_unregister_fixed_rate(struct clk_hw *hw);
