A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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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 <[email protected]>
Fixes: 76abbdde2d ("pwm: Add sysfs interface")
Signed-off-by: Thierry Reding <[email protected]>
This commit is contained in:
David Hsu 2016-08-09 14:57:46 -07:00 • committed by Thierry Reding
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);