Find and verify PRMT table before parse it, this eliminates a
warning on machines without PRMT table.

        [    7.197173] ACPI: PRMT not present

Fixes: cefc7ca46235 ("ACPI: PRM: implement OperationRegion handler for the PlatformRtMechanism subtype")
Signed-off-by: Aubrey Li <redacted>
Tested-by: Paul Menzel <redacted>
---
 drivers/acpi/prmt.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
index 1f6007a..89c22bc 100644
--- a/drivers/acpi/prmt.c
+++ b/drivers/acpi/prmt.c

@@ -288,10 +288,18 @@ static acpi_status acpi_platformrt_space_handler(u32 function,

 void __init init_prmt(void)
 {
+       struct acpi_table_header *tbl;
        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),
                                          0, acpi_parse_prmt, 0);
+       acpi_put_table(tbl);
        /*
         * Return immediately if PRMT table is not present or no PRM module found.
         */
--