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SubjectRe: [PATCH] ACPICA: Introduce acpi_load_table_with_index()
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


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