linux-kernel - Re: [PATCH v2 04/17] thermal: core: Clean up cdev binding/unbinding functions

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Message-ID: <dd7ffe0d8a14bce8975ff66d84f013a249427a15.camel@intel.com>
Date: Tue, 13 Aug 2024 07:38:43 +0000
From: "Zhang, Rui" <rui.zhang@...el.com>
To: "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, "rjw@...ysocki.net"
	<rjw@...ysocki.net>
CC: "lukasz.luba@....com" <lukasz.luba@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v2 04/17] thermal: core: Clean up cdev binding/unbinding
 functions

On Mon, 2024-08-12 at 15:56 +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Add a new label to thermal_bind_cdev_to_trip() and use it to
> eliminate
> two redundant !result check from that function, rename a label in
> thermal_unbind_cdev_from_trip() to reflect its actual purpose and
> adjust some white space in these functions.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> 
> v1 -> v2: No changes.
> 
> ---
>  drivers/thermal/thermal_core.c |   32 ++++++++++++++++++------------
> --
>  1 file changed, 18 insertions(+), 14 deletions(-)
> 
> Index: linux-pm/drivers/thermal/thermal_core.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_core.c
> +++ linux-pm/drivers/thermal/thermal_core.c
> @@ -806,6 +806,7 @@ int thermal_bind_cdev_to_trip(struct the
>         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
>         if (!dev)
>                 return -ENOMEM;
> +
>         dev->tz = tz;
>         dev->cdev = cdev;
>         dev->trip = trip;
> @@ -821,8 +822,7 @@ int thermal_bind_cdev_to_trip(struct the
>  
>         dev->id = result;
>         sprintf(dev->name, "cdev%d", dev->id);
> -       result =
> -           sysfs_create_link(&tz->device.kobj, &cdev->device.kobj,
> dev->name);
> +       result = sysfs_create_link(&tz->device.kobj, &cdev-
> >device.kobj, dev->name);
>         if (result)
>                 goto release_ida;
>  
> @@ -849,24 +849,26 @@ int thermal_bind_cdev_to_trip(struct the
>  
>         mutex_lock(&tz->lock);
>         mutex_lock(&cdev->lock);
> -       list_for_each_entry(pos, &tz->thermal_instances, tz_node)
> +
> +       list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
>                 if (pos->trip == trip && pos->cdev == cdev) {
>                         result = -EEXIST;
> -                       break;
> +                       goto remove_weight_file;

Need to unlock tz->lock and cdev->lock before quitting?

thanks,
rui

>                 }
> -       if (!result) {
> -               list_add_tail(&dev->tz_node, &tz->thermal_instances);
> -               list_add_tail(&dev->cdev_node, &cdev-
> >thermal_instances);
> -               atomic_set(&tz->need_update, 1);
> -
> -               thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV);
>         }
> +
> +       list_add_tail(&dev->tz_node, &tz->thermal_instances);
> +       list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
> +       atomic_set(&tz->need_update, 1);
> +
> +       thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV);
> +
>         mutex_unlock(&cdev->lock);
>         mutex_unlock(&tz->lock);
>  
> -       if (!result)
> -               return 0;
> +       return 0;
>  
> +remove_weight_file:
>         device_remove_file(&tz->device, &dev->weight_attr);
>  remove_trip_file:
>         device_remove_file(&tz->device, &dev->attr);
> @@ -914,6 +916,7 @@ int thermal_unbind_cdev_from_trip(struct
>  
>         mutex_lock(&tz->lock);
>         mutex_lock(&cdev->lock);
> +
>         list_for_each_entry_safe(pos, next, &tz->thermal_instances,
> tz_node) {
>                 if (pos->trip == trip && pos->cdev == cdev) {
>                         list_del(&pos->tz_node);
> @@ -923,15 +926,16 @@ int thermal_unbind_cdev_from_trip(struct
>  
>                         mutex_unlock(&cdev->lock);
>                         mutex_unlock(&tz->lock);
> -                       goto unbind;
> +                       goto free;
>                 }
>         }
> +
>         mutex_unlock(&cdev->lock);
>         mutex_unlock(&tz->lock);
>  
>         return -ENODEV;
>  
> -unbind:
> +free:
>         device_remove_file(&tz->device, &pos->weight_attr);
>         device_remove_file(&tz->device, &pos->attr);
>         sysfs_remove_link(&tz->device.kobj, pos->name);
> 
> 
>