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pwm: Unexport children before chip removal

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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 */