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Commit c1637e9c authored by Bob Moore's avatar Bob Moore Committed by Len Brown
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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: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 333b04ae

drivers/acpi/acpica/exregion.c

+10 −3
Original line number Diff line number Diff line
@@ -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);