linux-kernel - Re: [PATCH v3 1/1] power: Emit changed uevent on wakeup_sysfs

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Date:   Tue, 7 Jul 2020 18:00:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Cc:     linux-pm@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        chromeos-bluetooth-upstreaming@...omium.org,
        rafael.j.wysocki@...el.com, swboyd@...omium.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>,
        Pavel Machek <pavel@....cz>
Subject: Re: [PATCH v3 1/1] power: Emit changed uevent on
 wakeup_sysfs_add/remove

On Tue, Jul 07, 2020 at 08:49:05AM -0700, Abhishek Pandit-Subedi wrote:
> Udev rules that depend on the power/wakeup attribute don't get triggered
> correctly if device_set_wakeup_capable is called after the device is
> created. This can happen for several reasons (driver sets wakeup after
> device is created, wakeup is changed on parent device, etc) and it seems
> reasonable to emit a changed event when adding or removing attributes on
> the device.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> ---
> 
> Changes in v3:
> - Simplified error handling
> 
> Changes in v2:
> - Add newline at end of bt_dev_err
> 
>  drivers/base/power/sysfs.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
> index 24d25cf8ab1487..04c82373c8f240 100644
> --- a/drivers/base/power/sysfs.c
> +++ b/drivers/base/power/sysfs.c
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /* sysfs entries for device PM */
>  #include <linux/device.h>
> +#include <linux/kobject.h>
>  #include <linux/string.h>
>  #include <linux/export.h>
>  #include <linux/pm_qos.h>
> @@ -739,12 +740,18 @@ int dpm_sysfs_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid)
>  
>  int wakeup_sysfs_add(struct device *dev)
>  {
> -	return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
> +	int ret = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
> +
> +	if (ret)
> +		return ret;
> +
> +	return kobject_uevent(&dev->kobj, KOBJ_CHANGE);
>  }
>  
>  void wakeup_sysfs_remove(struct device *dev)
>  {
>  	sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
> +	return kobject_uevent(&dev->kobj, KOBJ_CHANGE);

Always test build and hopefully actually test, your patches before
sending them out :(