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| author |   Bob Moore <robert.moore@intel.com> | 2017-06-05 16:40:50 +0800 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-07-20 16:39:51 +0200 |
| commit | 852d4f9c71bc1582199200310c8951b79e451d6a (patch) | |
| tree | 4b3cfcffd519b6ef21077dfdd4d6bb365f143689 | |
| parent | ACPICA: iasl: Update to IORT SMMUv3 disassembling (diff) | |
| download | linux-dev-852d4f9c71bc1582199200310c8951b79e451d6a.tar.xz linux-dev-852d4f9c71bc1582199200310c8951b79e451d6a.zip | |
ACPICA: Update resource descriptor handling
ACPICA commit c8eac10178b387f9eb1935694e509d4518da77bb
This change restores the change introduced by commit 23b5bbe and
adds a comment concerning resource descriptor buffers that extend
beyond the END_TAG descriptor.
Link: https://github.com/acpica/acpica/commit/c8eac101
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/acpica/utresrc.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/acpi/acpica/utresrc.c b/drivers/acpi/acpica/utresrc.c index 70f78a4bf13b..d955bf852a03 100644 --- a/drivers/acpi/acpica/utresrc.c +++ b/drivers/acpi/acpica/utresrc.c @@ -184,9 +184,11 @@ 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 */ - - if (aml_length < sizeof(struct aml_resource_end_tag)) { + /* + * The absolute minimum resource template is one end_tag descriptor. + * However, we will treat a lone end_tag as just a simple buffer. + */ + if (aml_length <= sizeof(struct aml_resource_end_tag)) { return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); } @@ -243,8 +245,10 @@ acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state, *context = aml; } - /* Normal exit */ - + /* + * Normal exit. Note: We allow the buffer to be larger than + * the resource template, as long as the END_TAG exists. + */ return_ACPI_STATUS(AE_OK); } |