ACPI / osl: Remove acpi_get_table_with_size()/early_acpi_os_unmap_memory() users

This patch removes the users of the deprectated APIs:
 acpi_get_table_with_size()
 early_acpi_os_unmap_memory()
The following APIs should be used instead of:
 acpi_get_table()
 acpi_put_table()

The deprecated APIs are invented to be a replacement of acpi_get_table()
during the early stage so that the early mapped pointer will not be stored
in ACPICA core and thus the late stage acpi_get_table() won't return a
wrong pointer. The mapping size is returned just because it is required by
early_acpi_os_unmap_memory() to unmap the pointer during early stage.

But as the mapping size equals to the acpi_table_header.length
(see acpi_tb_init_table_descriptor() and acpi_tb_validate_table()), when
such a convenient result is returned, driver code will start to use it
instead of accessing acpi_table_header to obtain the length.

Thus this patch cleans up the drivers by replacing returned table size with
acpi_table_header.length, and should be a no-op.

Reported-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index 252a6d9c1da5..64d9cbd61678 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -132,14 +132,13 @@ static int __init acpi_fadt_sanity_check(void)
 	struct acpi_table_header *table;
 	struct acpi_table_fadt *fadt;
 	acpi_status status;
-	acpi_size tbl_size;
 	int ret = 0;
 
 	/*
 	 * FADT is required on arm64; retrieve it to check its presence
 	 * and carry out revision and ACPI HW reduced compliancy tests
 	 */
-	status = acpi_get_table_with_size(ACPI_SIG_FADT, 0, &table, &tbl_size);
+	status = acpi_get_table(ACPI_SIG_FADT, 0, &table);
 	if (ACPI_FAILURE(status)) {
 		const char *msg = acpi_format_exception(status);
 
@@ -170,10 +169,10 @@ static int __init acpi_fadt_sanity_check(void)
 
 out:
 	/*
-	 * acpi_get_table_with_size() creates FADT table mapping that
+	 * acpi_get_table() creates FADT table mapping that
 	 * should be released after parsing and before resuming boot
 	 */
-	early_acpi_os_unmap_memory(table, tbl_size);
+	acpi_put_table(table);
 	return ret;
 }