[PATCH 4/4] x86/ACPI: don't invalidate S5 data when S3 wakeup vector cannot be determined

[Jan Beulich <jbeulich@xxxxxxxx>]

We can be more tolerant as long as the data collected from FACS is only
needed to enter S3. A prior change already added suitable checking to
acpi_enter_sleep().

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/acpi/boot.c
+++ b/xen/arch/x86/acpi/boot.c
@@ -420,22 +420,22 @@ acpi_fadt_parse_sleep_info(struct acpi_t
                facs_pa = (uint64_t)fadt->facs;
        }
        if (!facs_pa)
-               goto bad;
+               return;
 
        facs = acpi_os_map_memory(facs_pa, sizeof(*facs));
        if (!facs)
-               goto bad;
+               return;
 
        if (strncmp(facs->signature, "FACS", 4)) {
                printk(KERN_ERR PREFIX "Invalid FACS signature %.4s\n",
                        facs->signature);
-               goto bad;
+               goto done;
        }
 
        if (facs->length < 24) {
                printk(KERN_ERR PREFIX "Invalid FACS table length: %#x",
                        facs->length);
-               goto bad;
+               goto done;
        }
 
        if (facs->length < 64)
@@ -452,6 +452,7 @@ acpi_fadt_parse_sleep_info(struct acpi_t
                offsetof(struct acpi_table_facs, firmware_waking_vector);
        acpi_sinfo.vector_width = 32;
 
+ done:
        acpi_os_unmap_memory(facs, sizeof(*facs));
 
        printk(KERN_INFO PREFIX