Lost of calls to of_platform_populate() are not unbalanced by a call to of_platform_depopulate(). This create issues while drivers are bind/unbind.
In way to solve those issues is to add devm_of_platform_populate() which will call of_platform_depopulate() when the device is unbound from the bus.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org --- drivers/of/platform.c | 77 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/of_platform.h | 20 ++++++++++++ 2 files changed, 97 insertions(+)
diff --git a/drivers/of/platform.c b/drivers/of/platform.c index b8064bc..3dbebf7 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -571,6 +571,83 @@ void of_platform_depopulate(struct device *parent) } EXPORT_SYMBOL_GPL(of_platform_depopulate);
+static void devm_of_platform_populate_release(struct device *dev, void *res) +{ + of_platform_depopulate(*(struct device **)res); +} + +/** + * devm_of_platform_populate() - Populate platform_devices from device tree data + * @dev: device that requested to populate from device tree data + * @root: parent of the first level to probe or NULL for the root of the tree + * @matches: match table, NULL to use the default + * @lookup: auxdata table for matching id and platform_data with device nodes + * @parent: parent to hook devices from, NULL for toplevel + * + * Similar to of_platform_populate(), but will automatically call + * of_platform_depopulate() when the device is unbound from the bus. + * + * Returns 0 on success, < 0 on failure. + */ +int devm_of_platform_populate(struct device *dev, + struct device_node *root, + const struct of_device_id *matches, + const struct of_dev_auxdata *lookup, + struct device *parent) +{ + struct device **ptr; + int ret; + + ptr = devres_alloc(devm_of_platform_populate_release, + sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + ret = of_platform_populate(root, matches, lookup, parent); + if (ret) { + devres_free(ptr); + } else { + *ptr = parent; + devres_add(dev, ptr); + } + + return ret; +} +EXPORT_SYMBOL_GPL(devm_of_platform_populate); + +static int devm_of_platform_match(struct device *dev, void *res, void *data) +{ + struct device **ptr = res; + + if (!ptr) { + WARN_ON(!ptr); + return 0; + } + + return *ptr == data; +} + +/** + * devm_of_platform_depopulate() - Remove devices populated from device tree + * @dev: device that requested to populate from device tree data + * @parent: device which children will be removed + * + * Complementary to devm_of_platform_populate(), this function removes children + * of the given device (and, recurrently, their children) that have been + * created from their respective device tree nodes (and only those, + * leaving others - eg. manually created - unharmed). + */ +void devm_of_platform_depopulate(struct device *dev, struct device *parent) +{ + int ret; + + ret = devres_release(dev, devm_of_platform_populate_release, + devm_of_platform_match, parent); + + WARN_ON(ret); +} +EXPORT_SYMBOL_GPL(devm_of_platform_depopulate); + #ifdef CONFIG_OF_DYNAMIC static int of_platform_notify(struct notifier_block *nb, unsigned long action, void *arg) diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h index 956a100..282fae3 100644 --- a/include/linux/of_platform.h +++ b/include/linux/of_platform.h @@ -76,6 +76,14 @@ extern int of_platform_default_populate(struct device_node *root, const struct of_dev_auxdata *lookup, struct device *parent); extern void of_platform_depopulate(struct device *parent); + +extern int devm_of_platform_populate(struct device *dev, + struct device_node *root, + const struct of_device_id *matches, + const struct of_dev_auxdata *lookup, + struct device *parent); +extern void devm_of_platform_depopulate(struct device *dev, + struct device *parent); #else static inline int of_platform_populate(struct device_node *root, const struct of_device_id *matches, @@ -91,6 +99,18 @@ static inline int of_platform_default_populate(struct device_node *root, return -ENODEV; } static inline void of_platform_depopulate(struct device *parent) { } + +static inline int devm_of_platform_populate(struct device *dev, + struct device_node *root, + const struct of_device_id *matches, + const struct of_dev_auxdata *lookup, + struct device *parent) +{ + return -ENODEV; +} + +static inline void devm_of_platform_depopulate(struct device *dev, + struct device *parent) { } #endif
#if defined(CONFIG_OF_DYNAMIC) && defined(CONFIG_OF_ADDRESS)