linux-kernel - Re: [PATCH 4/4] ACPI / dock: Simplify dock_init_hotplug() and dock_release

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Date:	Fri, 28 Jun 2013 13:16:29 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <liuj97@...il.com>,
	"Alexander E. Patrakov" <patrakov@...il.com>
Subject: Re: [PATCH 4/4] ACPI / dock: Simplify dock_init_hotplug() and dock_release_hotplug()

On Fri, Jun 28, 2013 at 12:48 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Make dock_init_hotplug() and dock_release_hotplug() slightly simpler
> and move some checks in those functions to the code paths where they
> are needed.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Acked-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  drivers/acpi/dock.c |   24 ++++++++----------------
>  1 file changed, 8 insertions(+), 16 deletions(-)
>
> Index: linux-pm/drivers/acpi/dock.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/dock.c
> +++ linux-pm/drivers/acpi/dock.c
> @@ -134,19 +134,16 @@ static int dock_init_hotplug(struct dock
>         int ret = 0;
>
>         mutex_lock(&hotplug_lock);
> -
> -       if (dd->hp_context) {
> +       if (WARN_ON(dd->hp_context)) {
>                 ret = -EEXIST;
>         } else {
>                 dd->hp_refcount = 1;
>                 dd->hp_ops = ops;
>                 dd->hp_context = context;
>                 dd->hp_release = release;
> +               if (init)
> +                       init(context);
>         }
> -
> -       if (!WARN_ON(ret) && init)
> -               init(context);
> -
>         mutex_unlock(&hotplug_lock);
>         return ret;
>  }
> @@ -161,22 +158,17 @@ static int dock_init_hotplug(struct dock
>   */
>  static void dock_release_hotplug(struct dock_dependent_device *dd)
>  {
> -       void (*release)(void *) = NULL;
> -       void *context = NULL;
> -
>         mutex_lock(&hotplug_lock);
> -
>         if (dd->hp_context && !--dd->hp_refcount) {
> +               void (*release)(void *) = dd->hp_release;
> +               void *context = dd->hp_context;
> +
>                 dd->hp_ops = NULL;
> -               context = dd->hp_context;
>                 dd->hp_context = NULL;
> -               release = dd->hp_release;
>                 dd->hp_release = NULL;
> +               if (release)
> +                       release(context);
>         }
> -
> -       if (release && context)
> -               release(context);
> -
>         mutex_unlock(&hotplug_lock);
>  }
>
>
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