Re: [PATCH] ACPICA: Introduce acpi_load_table_with_index()

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Mon, Sep 23, 2019 at 11:47:01AM +0200, Nikolaus Voss wrote:
> For unloading an ACPI table, it is necessary to provide the
> index of the table. The method intended for dynamically
> loading or hotplug addition of tables, acpi_load_table(),
> does not provide this information, so a new function
> acpi_load_table_with_index() with the same functionality,
> but an optional pointer to the loaded table index is introduced.
> 
> The new function is used in the acpi_configfs driver to save the
> index of the newly loaded table in order to unload it later.
> 

Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

But consider addressing my comments in one of previous mails.

> Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Fixes: d06c47e3dd07f ("ACPI: configfs: Resolve objects on host-directed table loads")
> Signed-off-by: Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>
> ---
>  drivers/acpi/acpi_configfs.c   |  2 +-
>  drivers/acpi/acpica/tbxfload.c | 43 ++++++++++++++++++++++++++++++++++
>  include/acpi/acpixf.h          |  6 +++++
>  3 files changed, 50 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/acpi_configfs.c b/drivers/acpi/acpi_configfs.c
> index 57d9d574d4dd..9e77d5a266c0 100644
> --- a/drivers/acpi/acpi_configfs.c
> +++ b/drivers/acpi/acpi_configfs.c
> @@ -53,7 +53,7 @@ static ssize_t acpi_table_aml_write(struct config_item *cfg,
>  	if (!table->header)
>  		return -ENOMEM;
>  
> -	ret = acpi_load_table(table->header);
> +	ret = acpi_load_table_with_index(table->header, &table->index);
>  	if (ret) {
>  		kfree(table->header);
>  		table->header = NULL;
> diff --git a/drivers/acpi/acpica/tbxfload.c b/drivers/acpi/acpica/tbxfload.c
> index 86f1693f6d29..7ea4fc879cb6 100644
> --- a/drivers/acpi/acpica/tbxfload.c
> +++ b/drivers/acpi/acpica/tbxfload.c
> @@ -309,6 +309,49 @@ acpi_status acpi_load_table(struct acpi_table_header *table)
>  
>  ACPI_EXPORT_SYMBOL(acpi_load_table)
>  
> +/*******************************************************************************
> + *
> + * FUNCTION:    acpi_load_table_with_index
> + *
> + * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
> + *                                    table to be loaded.
> + *              table_idx           - Pointer to a u32 for storing the table
> + *                                    index, might be NULL
> + * RETURN:      Status
> + *
> + * DESCRIPTION: see acpi_load_table() above. Additionally returns the index
> + *              of the newly created table in table_idx.
> + *
> + ******************************************************************************/
> +acpi_status acpi_load_table_with_index(struct acpi_table_header *table,
> +				       u32 *table_idx)
> +{
> +	acpi_status status;
> +	u32 table_index;
> +
> +	ACPI_FUNCTION_TRACE(acpi_load_table_with_index);
> +
> +	/* Parameter validation */
> +	if (!table)
> +		return_ACPI_STATUS(AE_BAD_PARAMETER);
> +
> +	/* Install the table and load it into the namespace */
> +	ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
> +	status = acpi_tb_install_and_load_table(
> +		ACPI_PTR_TO_PHYSADDR(table), ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
> +		FALSE, &table_index);
> +	if (table_idx)
> +		*table_idx = table_index;
> +
> +	if (ACPI_SUCCESS(status)) {
> +		/* Complete the initialization/resolution of new objects */
> +		acpi_ns_initialize_objects();
> +	}
> +
> +	return_ACPI_STATUS(status);
> +}
> +ACPI_EXPORT_SYMBOL(acpi_load_table_with_index)
> +
>  /*******************************************************************************
>   *
>   * FUNCTION:    acpi_unload_parent_table
> diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
> index e5e041413581..af375ab318de 100644
> --- a/include/acpi/acpixf.h
> +++ b/include/acpi/acpixf.h
> @@ -460,6 +460,12 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status ACPI_INIT_FUNCTION
>  ACPI_EXTERNAL_RETURN_STATUS(acpi_status
>  			    acpi_load_table(struct acpi_table_header *table))
>  
> +
> +ACPI_EXTERNAL_RETURN_STATUS(acpi_status
> +			    acpi_load_table_with_index(
> +				    struct acpi_table_header *table,
> +				    u32 *table_idx))
> +
>  ACPI_EXTERNAL_RETURN_STATUS(acpi_status
>  			    acpi_unload_parent_table(acpi_handle object))
>  
> -- 
> 2.17.1
> 

-- 
With Best Regards,
Andy Shevchenko