Revert "ACPICA: Resources: Not a valid resource if buffer length too long"

Revert commit 57707a9a7780 (ACPICA: Resources: Not a valid resource if
buffer length too long) as it is reported to prevent the TPM module
from loading on Lenovo X60 with Coreboot.

It also causes new confusing warnings to show up in the kernel log.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=195311
Reported-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpica/utresrc.c b/drivers/acpi/acpica/utresrc.c
index c86bae7..ff096d9 100644 (file)
--- a/drivers/acpi/acpica/utresrc.c
+++ b/drivers/acpi/acpica/utresrc.c
@@ -421,10 +421,8 @@ acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state,
 
        ACPI_FUNCTION_TRACE(ut_walk_aml_resources);
 
-       /*
-        * The absolute minimum resource template is one end_tag descriptor.
-        * However, we will treat a lone end_tag as just a simple buffer.
-        */
+       /* The absolute minimum resource template is one end_tag descriptor */
+
        if (aml_length < sizeof(struct aml_resource_end_tag)) {
                return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
        }
@@ -456,8 +454,9 @@ acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state,
                /* Invoke the user function */
 
                if (user_function) {
-                       status = user_function(aml, length, offset,
-                                              resource_index, context);
+                       status =
+                           user_function(aml, length, offset, resource_index,
+                                         context);
                        if (ACPI_FAILURE(status)) {
                                return_ACPI_STATUS(status);
                        }
@@ -481,12 +480,6 @@ acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state,
                                *context = aml;
                        }
 
-                       /* Check if buffer is defined to be longer than the resource length */
-
-                       if (aml_length > (offset + length)) {
-                               return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
-                       }
-
                        /* Normal exit */
 
                        return_ACPI_STATUS(AE_OK);