@@ -1600,12 +1600,13 @@ void pwmchip_put(struct pwm_chip *chip)
}
EXPORT_SYMBOL_GPL(pwmchip_put);
-static void pwmchip_release(struct device *pwmchip_dev)
+void pwmchip_release(struct device *pwmchip_dev)
{
struct pwm_chip *chip = pwmchip_from_dev(pwmchip_dev);
kfree(chip);
}
+EXPORT_SYMBOL_GPL(pwmchip_release);
struct pwm_chip *pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv)
{
@@ -485,6 +485,12 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner);
#define pwmchip_add(chip) __pwmchip_add(chip, THIS_MODULE)
void pwmchip_remove(struct pwm_chip *chip);
+/*
+ * For FFI wrapper use only:
+ * The Rust PWM abstraction needs this to properly free the pwm_chip.
+ */
+void pwmchip_release(struct device *dev);
+
int __devm_pwmchip_add(struct device *dev, struct pwm_chip *chip, struct module *owner);
#define devm_pwmchip_add(dev, chip) __devm_pwmchip_add(dev, chip, THIS_MODULE)
The upcoming Rust abstraction layer for the PWM subsystem uses a custom `dev->release` handler to safely manage the lifetime of its driver data. To prevent leaking the memory of the `struct pwm_chip` (allocated by `pwmchip_alloc`), this custom handler must also call the original `pwmchip_release` function to complete the cleanup. Make `pwmchip_release` a global, exported function so that it can be called from the Rust FFI bridge. This involves removing the `static` keyword, adding a prototype to the public header, and exporting the symbol. Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com> --- drivers/pwm/core.c | 3 ++- include/linux/pwm.h | 6 ++++++ 2 files changed, 8 insertions(+), 1 deletion(-)