linux-kernel - Re: [patch] acpi: use mutex instead of spinlock in dock driver

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Message-Id: <200610301512.56154.len.brown@intel.com>
Date:	Mon, 30 Oct 2006 15:12:55 -0500
From:	Len Brown <len.brown@...el.com>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch] acpi: use mutex instead of spinlock in dock driver

Applied.

thanks,
-Len

On Monday 30 October 2006 14:18, Kristen Carlson Accardi wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=7303
> 
> Use a mutex instead of a spinlock for locking the
> hotplug list because we need to call into the acpi
> subsystem which might sleep.
> 
> Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@...el.com>
> ---
>  drivers/acpi/dock.c |   16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> --- 2.6-git.orig/drivers/acpi/dock.c
> +++ 2.6-git/drivers/acpi/dock.c
> @@ -44,7 +44,7 @@ struct dock_station {
>  	unsigned long last_dock_time;
>  	u32 flags;
>  	spinlock_t dd_lock;
> -	spinlock_t hp_lock;
> +	struct mutex hp_lock;
>  	struct list_head dependent_devices;
>  	struct list_head hotplug_devices;
>  };
> @@ -114,9 +114,9 @@ static void
>  dock_add_hotplug_device(struct dock_station *ds,
>  			struct dock_dependent_device *dd)
>  {
> -	spin_lock(&ds->hp_lock);
> +	mutex_lock(&ds->hp_lock);
>  	list_add_tail(&dd->hotplug_list, &ds->hotplug_devices);
> -	spin_unlock(&ds->hp_lock);
> +	mutex_unlock(&ds->hp_lock);
>  }
>  
>  /**
> @@ -130,9 +130,9 @@ static void
>  dock_del_hotplug_device(struct dock_station *ds,
>  			struct dock_dependent_device *dd)
>  {
> -	spin_lock(&ds->hp_lock);
> +	mutex_lock(&ds->hp_lock);
>  	list_del(&dd->hotplug_list);
> -	spin_unlock(&ds->hp_lock);
> +	mutex_unlock(&ds->hp_lock);
>  }
>  
>  /**
> @@ -295,7 +295,7 @@ static void hotplug_dock_devices(struct 
>  {
>  	struct dock_dependent_device *dd;
>  
> -	spin_lock(&ds->hp_lock);
> +	mutex_lock(&ds->hp_lock);
>  
>  	/*
>  	 * First call driver specific hotplug functions
> @@ -317,7 +317,7 @@ static void hotplug_dock_devices(struct 
>  		else
>  			dock_create_acpi_device(dd->handle);
>  	}
> -	spin_unlock(&ds->hp_lock);
> +	mutex_unlock(&ds->hp_lock);
>  }
>  
>  static void dock_event(struct dock_station *ds, u32 event, int num)
> @@ -625,7 +625,7 @@ static int dock_add(acpi_handle handle)
>  	INIT_LIST_HEAD(&dock_station->dependent_devices);
>  	INIT_LIST_HEAD(&dock_station->hotplug_devices);
>  	spin_lock_init(&dock_station->dd_lock);
> -	spin_lock_init(&dock_station->hp_lock);
> +	mutex_init(&dock_station->hp_lock);
>  	ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
>  
>  	/* Find dependent devices */
> -
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> 
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