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pwm: Set class for exported channels in sysfs

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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 <[email protected]>
CC: Thierry Reding <[email protected]>
CC: H Hartley Sweeten <[email protected]>
CC: [email protected]
CC: [email protected]
CC: [email protected]
Signed-off-by: Thierry Reding <[email protected]>
This commit is contained in:
Gottfried Haider 2017-09-26 11:59:51 +00:00 • committed by Thierry Reding
commit 7e5d1fd75c
1 changed files with 1 additions and 0 deletions
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1
drivers/pwm/sysfs.c
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@ -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);