Re: [PATCH] ACPI: Defer enabling of level GPE until all pending notifies done

[Len Brown <lenb@kernel.org>]

applied to acpi test branch.

thanks,
-len

On Tuesday 13 November 2007 05:05, Alexey Starikovskiy wrote:
> Level GPE should not be enabled until all work caused by it is done,
> e.g. all Notify() methods are completed.
> This could be accomplished by appending enable_gpe function to the end
> of notify queue.
> 
> Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
> ---
> 
>  drivers/acpi/events/evgpe.c |   17 +++++++++++++----
>  drivers/acpi/osl.c          |   42 ++++++++----------------------------------
>  2 files changed, 21 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/acpi/events/evgpe.c b/drivers/acpi/events/evgpe.c
> index e22f4a9..b4509f9 100644
> --- a/drivers/acpi/events/evgpe.c
> +++ b/drivers/acpi/events/evgpe.c
> @@ -501,6 +501,7 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
>   *              an interrupt handler.
>   *
>   ******************************************************************************/
> +static void acpi_ev_asynch_enable_gpe(void *context);
>  
>  static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
>  {
> @@ -576,22 +577,30 @@ static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
>  					 method_node)));
>  		}
>  	}
> +	/* Defer enabling of GPE until all notify handlers are done */
> +	acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_asynch_enable_gpe,
> +				gpe_event_info);
> +	return_VOID;
> +}
>  
> -	if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
> +static void acpi_ev_asynch_enable_gpe(void *context)
> +{
> +	struct acpi_gpe_event_info *gpe_event_info = context;
> +	acpi_status status;
> +	if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
>  	    ACPI_GPE_LEVEL_TRIGGERED) {
>  		/*
>  		 * GPE is level-triggered, we clear the GPE status bit after
>  		 * handling the event.
>  		 */
> -		status = acpi_hw_clear_gpe(&local_gpe_event_info);
> +		status = acpi_hw_clear_gpe(gpe_event_info);
>  		if (ACPI_FAILURE(status)) {
>  			return_VOID;
>  		}
>  	}
>  
>  	/* Enable this GPE */
> -
> -	(void)acpi_hw_write_gpe_enable_reg(&local_gpe_event_info);
> +	(void)acpi_hw_write_gpe_enable_reg(gpe_event_info);
>  	return_VOID;
>  }
>  
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index aabc6ca..6816ac6 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -625,25 +625,6 @@ static void acpi_os_execute_deferred(struct work_struct *work)
>  	dpc->function(dpc->context);
>  	kfree(dpc);
>  
> -	/* Yield cpu to notify thread */
> -	cond_resched();
> -
> -	return;
> -}
> -
> -static void acpi_os_execute_notify(struct work_struct *work)
> -{
> -	struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
> -
> -	if (!dpc) {
> -		printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
> -		return;
> -	}
> -
> -	dpc->function(dpc->context);
> -
> -	kfree(dpc);
> -
>  	return;
>  }
>  
> @@ -667,7 +648,7 @@ acpi_status acpi_os_execute(acpi_execute_type type,
>  {
>  	acpi_status status = AE_OK;
>  	struct acpi_os_dpc *dpc;
> -
> +	struct workqueue_struct *queue;
>  	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
>  			  "Scheduling function [%p(%p)] for deferred execution.\n",
>  			  function, context));
> @@ -691,20 +672,13 @@ acpi_status acpi_os_execute(acpi_execute_type type,
>  	dpc->function = function;
>  	dpc->context = context;
>  
> -	if (type == OSL_NOTIFY_HANDLER) {
> -		INIT_WORK(&dpc->work, acpi_os_execute_notify);
> -		if (!queue_work(kacpi_notify_wq, &dpc->work)) {
> -			status = AE_ERROR;
> -			kfree(dpc);
> -		}
> -	} else {
> -		INIT_WORK(&dpc->work, acpi_os_execute_deferred);
> -		if (!queue_work(kacpid_wq, &dpc->work)) {
> -			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
> -				  "Call to queue_work() failed.\n"));
> -			status = AE_ERROR;
> -			kfree(dpc);
> -		}
> +	INIT_WORK(&dpc->work, acpi_os_execute_deferred);
> +	queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
> +	if (!queue_work(queue, &dpc->work)) {
> +		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
> +			  "Call to queue_work() failed.\n"));
> +		status = AE_ERROR;
> +		kfree(dpc);
>  	}
>  	return_ACPI_STATUS(status);
>  }
> 
> -
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