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[04/15] ACPICA: Add a comment, no functional change

Message ID 80e42989e573df6257093402632b06b6341856bf.1501730699.git.lv.zheng@intel.com (mailing list archive)
State Accepted, archived
Delegated to: Rafael Wysocki
Headers show

Commit Message

Lv Zheng Aug. 3, 2017, 6:26 a.m. UTC 
From: Bob Moore <robert.moore@intel.com>

ACPICA commit d586c29a026a6172c1113df4d75fd6d764196e77

Describe 2nd byte of the end_tag resource descriptor.

Link: https://github.com/acpica/acpica/commit/d586c29a
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
---
 drivers/acpi/acpica/utresrc.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/drivers/acpi/acpica/utresrc.c b/drivers/acpi/acpica/utresrc.c
index d955bf8..517acf8 100644
--- a/drivers/acpi/acpica/utresrc.c
+++ b/drivers/acpi/acpica/utresrc.c
@@ -239,6 +239,13 @@  acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state,
 				return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 			}
 
+			/*
+			 * Don't attempt to perform any validation on the 2nd byte.
+			 * Although all known ASL compilers insert a zero for the 2nd
+			 * byte, it can also be a checksum (as per the ACPI spec),
+			 * and this is occasionally seen in the field. July 2017.
+			 */
+
 			/* Return the pointer to the end_tag if requested */
 
 			if (!user_function) {