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authorBob Moore <robert.moore@intel.com>2010-04-01 11:09:00 +0800
committerLen Brown <len.brown@intel.com>2010-04-20 10:43:15 -0400
commitc1637e9c649a0eb72c467041d78275aabdd48a41 (patch)
tree263487b920fcfb8796bcafe785e80a9756d7dd14
parent333b04ae338e3421297d46c508f053a6767d2883 (diff)
downloadlinux-linaro-stable-c1637e9c649a0eb72c467041d78275aabdd48a41.tar.gz
ACPICA: Add write support for DataTable operation regions
The original implementation only supported reading from a DataTable region. However, some machines have been seen that actually write to the ACPI table contained in such a region. This change adds support for writing to a DataTable region. 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>
-rw-r--r--drivers/acpi/acpica/exregion.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/acpi/acpica/exregion.c b/drivers/acpi/acpica/exregion.c
index a8703cc20ad1..531000fc77d2 100644
--- a/drivers/acpi/acpica/exregion.c
+++ b/drivers/acpi/acpica/exregion.c
@@ -491,8 +491,10 @@ acpi_ex_data_table_space_handler(u32 function,
{
ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
- /* Perform the memory read or write */
-
+ /*
+ * Perform the memory read or write. The bit_width was already
+ * validated.
+ */
switch (function) {
case ACPI_READ:
@@ -502,9 +504,14 @@ acpi_ex_data_table_space_handler(u32 function,
break;
case ACPI_WRITE:
+
+ ACPI_MEMCPY(ACPI_PHYSADDR_TO_PTR(address),
+ ACPI_CAST_PTR(char, value), ACPI_DIV_8(bit_width));
+ break;
+
default:
- return_ACPI_STATUS(AE_SUPPORT);
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
}
return_ACPI_STATUS(AE_OK);