lkml.org 
[lkml]   [2019]   [Sep]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] ACPICA: Introduce acpi_load_table_with_index()
Date
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.

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
\
 
 \ /
  Last update: 2019-09-23 11:47    [W:0.268 / U:0.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site