From c1637e9c649a0eb72c467041d78275aabdd48a41 Mon Sep 17 00:00:00 2001 From: Bob Moore Date: Thu, 1 Apr 2010 11:09:00 +0800 Subject: [PATCH] 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 Signed-off-by: Lin Ming Signed-off-by: Len Brown --- drivers/acpi/acpica/exregion.c | 13 ++++++++++--- 1 file 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); -- 2.30.2