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Commit 7d97277b authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

acpi/x86: introduce __apci_map_table, v4 



to prevent wrongly overwriting fixmap that still want to use.

ACPI used to rely on low mappings being all linearly mapped and
grew a habit: it never really unmapped certain kinds of tables
after use.

This can cause problems - for example the hypothetical case
when some spurious access still references it.

v2: remove prev_map and prev_size in __apci_map_table
v3: let acpi_os_unmap_memory() call early_iounmap too, so remove extral calling to
early_acpi_os_unmap_memory
v4: fix typo in one acpi_get_table_with_size calling

Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Acked-by: default avatarLen Brown <len.brown@intel.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 05876f88

arch/ia64/kernel/acpi.c

+4 −0
Original line number Diff line number Diff line
@@ -199,6 +199,10 @@ char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size) 
	return __va(phys_addr);

}



char *__init __acpi_unmap_table(unsigned long virt_addr, unsigned long size)

{

}



/* --------------------------------------------------------------------------

                            Boot-time Table Parsing

   -------------------------------------------------------------------------- */

arch/x86/kernel/acpi/boot.c

+7 −10
Original line number Diff line number Diff line
@@ -121,21 +121,18 @@ enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC; 
 */

char *__init __acpi_map_table(unsigned long phys, unsigned long size)

{

	static char *prev_map;

	static unsigned long prev_size;



	if (prev_map) {

		early_iounmap(prev_map, prev_size);

		prev_map = NULL;

	}



	if (!phys || !size)

		return NULL;



	prev_size = size;

	prev_map = early_ioremap(phys, size);

	return early_ioremap(phys, size);

}

void __init __acpi_unmap_table(char *map, unsigned long size)

{

	if (!map || !size)

		return;



	return prev_map;

	early_iounmap(map, size);

}



#ifdef CONFIG_PCI_MMCONFIG

drivers/acpi/acpica/tbxface.c

+14 −3
Original line number Diff line number Diff line
@@ -365,7 +365,7 @@ ACPI_EXPORT_SYMBOL(acpi_unload_table_id) 


/*******************************************************************************

 *

 * FUNCTION:    acpi_get_table

 * FUNCTION:    acpi_get_table_with_size

 *

 * PARAMETERS:  Signature           - ACPI signature of needed table

 *              Instance            - Which instance (for SSDTs)
@@ -377,8 +377,9 @@ ACPI_EXPORT_SYMBOL(acpi_unload_table_id) 
 *

 *****************************************************************************/

acpi_status

acpi_get_table(char *signature,

	       u32 instance, struct acpi_table_header **out_table)

acpi_get_table_with_size(char *signature,

	       u32 instance, struct acpi_table_header **out_table,

	       acpi_size *tbl_size)

{

       u32 i;

       u32 j;
@@ -408,6 +409,7 @@ acpi_get_table(char *signature, 
		    acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);

		if (ACPI_SUCCESS(status)) {

			*out_table = acpi_gbl_root_table_list.tables[i].pointer;

			*tbl_size = acpi_gbl_root_table_list.tables[i].length;

		}



		if (!acpi_gbl_permanent_mmap) {
@@ -420,6 +422,15 @@ acpi_get_table(char *signature, 
	return (AE_NOT_FOUND);

}



acpi_status

acpi_get_table(char *signature,

	       u32 instance, struct acpi_table_header **out_table)

{

	acpi_size tbl_size;



	return acpi_get_table_with_size(signature,

		       instance, out_table, &tbl_size);

}

ACPI_EXPORT_SYMBOL(acpi_get_table)



/*******************************************************************************

drivers/acpi/bus.c

+0 −6
Original line number Diff line number Diff line
@@ -694,12 +694,6 @@ void __init acpi_early_init(void) 
	if (!acpi_strict)

		acpi_gbl_enable_interpreter_slack = TRUE;



	/*

	 * Doing a zero-sized mapping will clear out the previous

	 * __acpi_map_table() mapping, if any.

	 */

	__acpi_map_table(0, 0);



	acpi_gbl_permanent_mmap = 1;



	status = acpi_reallocate_root_table();

drivers/acpi/osl.c

+9 −2
Original line number Diff line number Diff line
@@ -274,12 +274,19 @@ EXPORT_SYMBOL_GPL(acpi_os_map_memory); 


void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)

{

	if (acpi_gbl_permanent_mmap) {

	if (acpi_gbl_permanent_mmap)

		iounmap(virt);

	}

	else

		__acpi_unmap_table(virt, size);

}

EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);



void early_acpi_os_unmap_memory(void __iomem * virt, acpi_size size)

{

	if (!acpi_gbl_permanent_mmap)

		__acpi_unmap_table(virt, size);

}



#ifdef ACPI_FUTURE_USAGE

acpi_status

acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)