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37 lines
1.3 KiB
37 lines
1.3 KiB
6 years ago
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From dd5e8c9945f3f9a9bd9b307087c2881d8399c87b Mon Sep 17 00:00:00 2001
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From: Gottfried Haider <gottfried.haider@gmail.com>
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Date: Tue, 26 Sep 2017 11:59:51 +0000
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Subject: [PATCH 137/454] pwm: Set class for exported channels in sysfs
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[ Upstream commit 7e5d1fd75c3dde9fc10c4472b9368089d1b81d00 ]
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Notifications for devices without bus or class set get dropped by
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dev_uevent_filter(). Adding the class to the exported child matches
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what the GPIO subsystem is doing.
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With this change exporting a channel triggers a udev event, which
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gives userspace a chance to fixup permissions and makes it possible
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for non-root users to make use of the PWM subsystem.
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Signed-off-by: Gottfried Haider <gottfried.haider@gmail.com>
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CC: Thierry Reding <thierry.reding@gmail.com>
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CC: H Hartley Sweeten <hsweeten@visionengravers.com>
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CC: linux-pwm@vger.kernel.org
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CC: linux-arm-kernel@lists.infradead.org
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CC: linux-rpi-kernel@lists.infradead.org
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Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
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---
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drivers/pwm/sysfs.c | 1 +
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1 file changed, 1 insertion(+)
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--- a/drivers/pwm/sysfs.c
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+++ b/drivers/pwm/sysfs.c
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@@ -263,6 +263,7 @@ static int pwm_export_child(struct devic
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export->pwm = pwm;
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mutex_init(&export->lock);
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+ export->child.class = parent->class;
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export->child.release = pwm_export_release;
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export->child.parent = parent;
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export->child.devt = MKDEV(0, 0);
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