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Commit 7e5d1fd7 authored by Gottfried Haider's avatar Gottfried Haider Committed by Thierry Reding
Browse files

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.

Signed-off-by: default avatarGottfried Haider <gottfried.haider@gmail.com>
CC: Thierry Reding <thierry.reding@gmail.com>
CC: H Hartley Sweeten <hsweeten@visionengravers.com>
CC: linux-pwm@vger.kernel.org
CC: linux-arm-kernel@lists.infradead.org
CC: linux-rpi-kernel@lists.infradead.org
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent 4fbd8d19

drivers/pwm/sysfs.c

+1 −0
Original line number Diff line number Diff line
@@ -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);