target/linux/brcm2708/patches-4.14/950-0137-pwm-Set-class-for-exported-channels-in-sysfs.patch

   1 From dd5e8c9945f3f9a9bd9b307087c2881d8399c87b Mon Sep 17 00:00:00 2001
   2 From: Gottfried Haider <gottfried.haider@gmail.com>
   3 Date: Tue, 26 Sep 2017 11:59:51 +0000
   4 Subject: [PATCH 137/454] pwm: Set class for exported channels in sysfs
   5
   6 [ Upstream commit 7e5d1fd75c3dde9fc10c4472b9368089d1b81d00 ]
   7
   8 Notifications for devices without bus or class set get dropped by
   9 dev_uevent_filter(). Adding the class to the exported child matches
  10 what the GPIO subsystem is doing.
  11
  12 With this change exporting a channel triggers a udev event, which
  13 gives userspace a chance to fixup permissions and makes it possible
  14 for non-root users to make use of the PWM subsystem.
  15
  16 Signed-off-by: Gottfried Haider <gottfried.haider@gmail.com>
  17 CC: Thierry Reding <thierry.reding@gmail.com>
  18 CC: H Hartley Sweeten <hsweeten@visionengravers.com>
  19 CC: linux-pwm@vger.kernel.org
  20 CC: linux-arm-kernel@lists.infradead.org
  21 CC: linux-rpi-kernel@lists.infradead.org
  22 Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
  23 ---
  24  drivers/pwm/sysfs.c | 1 +
  25  1 file changed, 1 insertion(+)
  26
  27 --- a/drivers/pwm/sysfs.c
  28 +++ b/drivers/pwm/sysfs.c
  29 @@ -263,6 +263,7 @@ static int pwm_export_child(struct devic
  30         export->pwm = pwm;
  31         mutex_init(&export->lock);
  32
  33 +       export->child.class = parent->class;
  34         export->child.release = pwm_export_release;
  35         export->child.parent = parent;
  36         export->child.devt = MKDEV(0, 0);