From dd5e8c9945f3f9a9bd9b307087c2881d8399c87b Mon Sep 17 00:00:00 2001 From: Gottfried Haider Date: Tue, 26 Sep 2017 11:59:51 +0000 Subject: [PATCH 137/454] pwm: Set class for exported channels in sysfs [ Upstream commit 7e5d1fd75c3dde9fc10c4472b9368089d1b81d00 ] 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. Signed-off-by: Gottfried Haider CC: Thierry Reding CC: H Hartley Sweeten CC: linux-pwm@vger.kernel.org CC: linux-arm-kernel@lists.infradead.org CC: linux-rpi-kernel@lists.infradead.org Signed-off-by: Thierry Reding --- drivers/pwm/sysfs.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/pwm/sysfs.c +++ b/drivers/pwm/sysfs.c @@ -263,6 +263,7 @@ static int pwm_export_child(struct devic 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);