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pwm: Unexport children before chip removal 

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 <davidhsu@google.com>
Fixes: 76abbdde2d ("pwm: Add sysfs interface")
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
David Hsu 2016-08-09 14:57:46 -07:00 committed by Thierry Reding
parent 29b4817d40
commit 0733424c9b
3 changed files with 25 additions and 0 deletions
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2
drivers/pwm/core.c
View File

@ -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++) {

18
drivers/pwm/sysfs.c
View File

@ -409,6 +409,24 @@ 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);

5
include/linux/pwm.h
View File

@ -641,6 +641,7 @@ 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)
{
@ -649,6 +650,10 @@ 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 */