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authorDavid Hsu <davidhsu@google.com>2016-08-10 00:57:46 +0300
committerThierry Reding <thierry.reding@gmail.com>2016-09-05 17:45:39 +0300
commit0733424c9ba9f42242409d1ece780777272f7ea1 (patch)
tree7d4ab85ed86beb175351738eef22132d8987678e /drivers/pwm/sysfs.c
parent29b4817d4018df78086157ea3a55c1d9424a7cfc (diff)
downloadlinux-0733424c9ba9f42242409d1ece780777272f7ea1.tar.xz
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: 76abbdde2d95 ("pwm: Add sysfs interface") Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/sysfs.c')
-rw-r--r--drivers/pwm/sysfs.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 18ed725594c3..0296d8178ae2 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -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);