linux-kernel - RE: [PATCH 2/6] ACPI / EC: Cleanup

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Date:	Tue, 9 Jun 2015 14:41:58 +0000
From:	"Zheng, Lv" <lv.zheng@...el.com>
To:	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"Brown, Len" <len.brown@...el.com>
CC:	Lv Zheng <zetalog@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: RE: [PATCH 2/6] ACPI / EC: Cleanup _Qxx evaluation work item.

Hi, Rafael

This patch is conflict against a recent discovered windows EC behavior, learned from kernel Bugzilla 94411.
https://bugzilla.kernel.org/show_bug.cgi?id=94411
I need to remove it from this patchset and rebase the rest ones.
Please ignore the v1 of this patchset, I'll send v2 of this patchset after testing.

Thanks and best regards
-Lv

> From: Zheng, Lv
> Sent: Monday, June 08, 2015 1:28 PM
> 
> The _Qxx evaluation work item can be eliminated and _Qxx can be evaluated
> right in the same work item as the QR_EC transaction. This patch cleans up
> the code to achieve this.
> 
> Originally, QR_EC transaction and _Qxx evaluation were all done in the same
> work queue flushed by acpi_os_wait_events_complete(). Though the QR_EC
> transaction (previous commit) and _Qxx evaluation (this commmit) are now
> moved to the work queue that is not covered by
> acpi_os_wait_events_complete(), there is no issue can be seen in the
> suspend/resume tests.
> 
> Signed-off-by: Lv Zheng <lv.zheng@...el.com>
> ---
>  drivers/acpi/ec.c |   35 ++++++++++++-----------------------
>  1 file changed, 12 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
> index 0ce8b6e8..b956dbc 100644
> --- a/drivers/acpi/ec.c
> +++ b/drivers/acpi/ec.c
> @@ -904,27 +904,12 @@ void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
>  }
>  EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
> 
> -static void acpi_ec_run(void *cxt)
> -{
> -	struct acpi_ec_query_handler *handler = cxt;
> -
> -	if (!handler)
> -		return;
> -	ec_dbg_evt("Query(0x%02x) started", handler->query_bit);
> -	if (handler->func)
> -		handler->func(handler->data);
> -	else if (handler->handle)
> -		acpi_evaluate_object(handler->handle, NULL, NULL, NULL);
> -	ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit);
> -	acpi_ec_put_query_handler(handler);
> -}
> -
>  static int acpi_ec_query(struct acpi_ec *ec, u8 *data)
>  {
>  	u8 value = 0;
>  	int result;
> -	acpi_status status;
>  	struct acpi_ec_query_handler *handler;
> +	bool handler_found = false;
>  	struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
>  				.wdata = NULL, .rdata = &value,
>  				.wlen = 0, .rlen = 1};
> @@ -947,17 +932,21 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 *data)
>  		if (value == handler->query_bit) {
>  			/* have custom handler for this bit */
>  			handler = acpi_ec_get_query_handler(handler);
> -			ec_dbg_evt("Query(0x%02x) scheduled",
> -				   handler->query_bit);
> -			status = acpi_os_execute((handler->func) ?
> -				OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER,
> -				acpi_ec_run, handler);
> -			if (ACPI_FAILURE(status))
> -				result = -EBUSY;
> +			handler_found = true;
>  			break;
>  		}
>  	}
>  	mutex_unlock(&ec->mutex);
> +
> +	if (handler_found) {
> +		ec_dbg_evt("Query(0x%02x) started", handler->query_bit);
> +		if (handler->func)
> +			handler->func(handler->data);
> +		else if (handler->handle)
> +			acpi_evaluate_object(handler->handle, NULL, NULL, NULL);
> +		ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit);
> +		acpi_ec_put_query_handler(handler);
> +	}
>  	return result;
>  }
> 
> --
> 1.7.10

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