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ACPI: PRM: Find PRMT table before parsing it

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Find and verify PRMT before parsing it, which eliminates a
warning on machines without PRMT:

	[    7.197173] ACPI: PRMT not present

Fixes: cefc7ca462 ("ACPI: PRM: implement OperationRegion handler for the PlatformRtMechanism subtype")
Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>
Tested-by: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: 5.14+ <stable@vger.kernel.org> # 5.14+
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Aubrey Li 2021-09-08 18:55:45 +08:00 • committed by Rafael J. Wysocki
parent 8e235ff9a1
commit 3265cc3ec5
1 changed files with 9 additions and 1 deletions
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10
drivers/acpi/prmt.c
View file

@ -288,10 +288,18 @@ invalid_guid:
void __init init_prmt(void) void __init init_prmt(void)
{ {
struct acpi_table_header *tbl;
acpi_status status; acpi_status status;
int mc = acpi_table_parse_entries(ACPI_SIG_PRMT, sizeof(struct acpi_table_prmt) + int mc;
status = acpi_get_table(ACPI_SIG_PRMT, 0, &tbl);
if (ACPI_FAILURE(status))
return;
mc = acpi_table_parse_entries(ACPI_SIG_PRMT, sizeof(struct acpi_table_prmt) +
sizeof (struct acpi_table_prmt_header), sizeof (struct acpi_table_prmt_header),
0, acpi_parse_prmt, 0); 0, acpi_parse_prmt, 0);
acpi_put_table(tbl);
/* /*
* Return immediately if PRMT table is not present or no PRM module found. * Return immediately if PRMT table is not present or no PRM module found.
*/ */