Exported pwm channels aren't removed before the pwmchip and are
leaked. This results in invalid sysfs files. This fix removes
all exported pwm channels before chip removal.
Signed-off-by: David Hsu <david...@google.com>
---
drivers/pwm/core.c | 2 ++
drivers/pwm/sysfs.c | 18 ++++++++++++++++++
include/linux/pwm.h | 5 +++++
3 files changed, 25 insertions(+)
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index ed337a8c..869af84 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -339,6 +339,8 @@ int pwmchip_remove(struct pwm_chip *chip)
unsigned int i;
int ret = 0;
+ pwmchip_sysfs_unexport_children(chip);
+
mutex_lock(&pwm_lock);
for (i = 0; i < chip->npwm; i++) {
diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index cb2b376..b3ccb8f 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -400,6 +400,24 @@ void pwmchip_sysfs_unexport(struct pwm_chip *chip)
}
}
+void pwmchip_sysfs_unexport_children(struct pwm_chip *chip)
+{
+ struct device *parent;
+ unsigned int i;
+
+ parent = class_find_device(&pwm_class, NULL, chip,
+ pwmchip_sysfs_match);
+ if (!parent)
+ return;
+
+ for (i = 0; i < chip->npwm; i++) {
+ struct pwm_device *pwm = &chip->pwms[i];
+
+ if (test_bit(PWMF_EXPORTED, &pwm->flags))
+ pwm_unexport_child(parent, pwm);
+ }
+}
+
static int __init pwm_sysfs_init(void)
{
return class_register(&pwm_class);
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index c038ae3..16a0ae0 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -530,6 +530,7 @@ static inline void pwm_remove_table(struct pwm_lookup
*table, size_t num)
#ifdef CONFIG_PWM_SYSFS
void pwmchip_sysfs_export(struct pwm_chip *chip);
void pwmchip_sysfs_unexport(struct pwm_chip *chip);
+void pwmchip_sysfs_unexport_children(struct pwm_chip *chip);
#else
static inline void pwmchip_sysfs_export(struct pwm_chip *chip)
{
@@ -538,6 +539,10 @@ static inline void pwmchip_sysfs_export(struct pwm_chip
*chip)
static inline void pwmchip_sysfs_unexport(struct pwm_chip *chip)
{
}
+
+static inline void pwmchip_sysfs_unexport_children(struct pwm_chip *chip)
+{
+}
#endif /* CONFIG_PWM_SYSFS */
#endif /* __LINUX_PWM_H */
--
2.8.0.rc3.226.g39d4020
