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authorBob Moore <robert.moore@intel.com>2015-12-29 08:56:14 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-01-01 05:47:35 +0300
commitc6c6069cad37952da71d2a24eb6ee0a87074b35c (patch)
tree96fa2a7a1f0f5a16afb985d226038278408a02a0
parent07cb390f43e7fd9daceb6a1e223a82c832f5f9ab (diff)
downloadlinux-c6c6069cad37952da71d2a24eb6ee0a87074b35c.tar.xz
ACPICA: Add comment explaining _SUB removal
ACPICA commit 81a89968f83bfc3b1d0f0f80f2da08ea69646053 Adds a lengthy comment to acpi_get_object_info explaining the removal of _SUB and why no complex methods can be added ever to this interface. Link: https://github.com/acpica/acpica/commit/81a89968 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/nsxfname.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsxfname.c b/drivers/acpi/acpica/nsxfname.c
index 0e4e6b7983cc..669e0f1b0967 100644
--- a/drivers/acpi/acpica/nsxfname.c
+++ b/drivers/acpi/acpica/nsxfname.c
@@ -267,6 +267,13 @@ static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
*
* Note: Allocates the return buffer, must be freed by the caller.
*
+ * Note: This interface is intended to be used during the initial device
+ * discovery namespace traversal. Therefore, no complex methods can be
+ * executed, especially those that access operation regions. Therefore, do
+ * not add any additional methods that could cause problems in this area.
+ * this was the fate of the _SUB method which was found to cause such
+ * problems and was removed (11/2015).
+ *
******************************************************************************/
acpi_status