pwm: Set class for exported channels in sysfs

Notifications for devices without bus or class set get dropped by dev_uevent_filter. Adding the class to the exported child matches what the gpio subsystem is doing.

With this change exporting a channel triggers a udev event, which gives userspace a chance to fixup permissions and makes it possible for non-root users to make use of the pwm subsystem.

---
 drivers/pwm/sysfs.c | 1 +
 1 file changed, 1 insertion(+)

index a813239..83f2b0b 100644
@@ -263,6 +263,7 @@ static int pwm_export_child(struct device *parent, struct pwm_device *pwm)
 	export->pwm = pwm;
 	mutex_init(&export->lock);
 
+	export->child.class = parent->class;
 	export->child.release = pwm_export_release;
 	export->child.parent = parent;
 	export->child.devt = MKDEV(0, 0);

2.1.4

Sorry for the long delay, applied to for-next now.

Thanks,
Thierry
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