ACPICA: Add a mechanism to escape infinite AML While() loops

Add a loop counter to force exit from AML While loops if the
count becomes too large. This can occur in poorly written AML
when the hardware does not respond within a while loop and the
loop does not implement a timeout. The maximum loop count is
configurable. A new exception code is returned when a loop is
broken, AE_AML_INFINITE_LOOP.  Bob Moore, Alexey Starikovskiy.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 8 insertions, 1 deletions

diff --git a/include/acpi/acconfig.h b/include/acpi/acconfig.h
index 29feee27f0ea..e50fe7157463 100644
--- a/include/acpi/acconfig.h
+++ b/include/acpi/acconfig.h
@@ -119,6 +119,10 @@
 
 #define ACPI_ROOT_TABLE_SIZE_INCREMENT  4
 
+/* Maximum number of While() loop iterations before forced abort */
+
+#define ACPI_MAX_LOOP_ITERATIONS        0xFFFF
+
 /******************************************************************************
  *
  * ACPI Specification constants (Do not change unless the specification changes)
diff --git a/include/acpi/acexcep.h b/include/acpi/acexcep.h
index 84f5cb242863..a1ae1057d2ef 100644
--- a/include/acpi/acexcep.h
+++ b/include/acpi/acexcep.h
@@ -153,8 +153,9 @@
 #define AE_AML_CIRCULAR_REFERENCE       (acpi_status) (0x001E | AE_CODE_AML)
 #define AE_AML_BAD_RESOURCE_LENGTH      (acpi_status) (0x001F | AE_CODE_AML)
 #define AE_AML_ILLEGAL_ADDRESS          (acpi_status) (0x0020 | AE_CODE_AML)
+#define AE_AML_INFINITE_LOOP            (acpi_status) (0x0021 | AE_CODE_AML)
 
-#define AE_CODE_AML_MAX                 0x0020
+#define AE_CODE_AML_MAX                 0x0021
 
 /*
  * Internal exceptions used for control
@@ -267,6 +268,7 @@ char const *acpi_gbl_exception_names_aml[] = {
         "AE_AML_CIRCULAR_REFERENCE",
         "AE_AML_BAD_RESOURCE_LENGTH",
         "AE_AML_ILLEGAL_ADDRESS",
+        "AE_AML_INFINITE_LOOP"
 };
 
 char const *acpi_gbl_exception_names_ctrl[] = {
diff --git a/include/acpi/aclocal.h b/include/acpi/aclocal.h
index ecab527cf78e..0323fa9aa3e6 100644
--- a/include/acpi/aclocal.h
+++ b/include/acpi/aclocal.h
@@ -566,6 +566,7 @@ struct acpi_control_state {
         union acpi_parse_object *predicate_op;
         u8 *aml_predicate_start;        /* Start of if/while predicate */
         u8 *package_end;        /* End of if/while block */
+        u32 loop_count;         /* While() loop counter */
 };
 
 /*