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authorBjorn Helgaas <bjorn.helgaas@hp.com>2006-03-29 02:04:00 +0400
committerLen Brown <len.brown@intel.com>2006-04-02 07:05:18 +0400
commit459c7266d7a5c1730169258217e25fdd1b7ca854 (patch)
tree79b50e2c6d530539bfe4a468ab290069ddf8ac32 /drivers/acpi/acpi_memhotplug.c
parent683aa4012f53b2ada0f430487e05d37b0d94e90a (diff)
downloadlinux-459c7266d7a5c1730169258217e25fdd1b7ca854.tar.xz
ACPI: fix memory hotplug range length handling
Address space descriptors contain _MIN, _MAX, and _LEN. _MIN and _MAX are the bounds within which the region can be moved (this is clarified in Table 6-38 of the ACPI 3.0 spec). We should use _LEN to determine the size of the region, not _MAX - _MIN + 1. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpi_memhotplug.c')
-rw-r--r--drivers/acpi/acpi_memhotplug.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index d882bf87fa96..e0a95ba72371 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -74,7 +74,7 @@ struct acpi_memory_device {
unsigned short caching; /* memory cache attribute */
unsigned short write_protect; /* memory read/write attribute */
u64 start_addr; /* Memory Range start physical addr */
- u64 end_addr; /* Memory Range end physical addr */
+ u64 length; /* Memory Range length */
};
static int
@@ -97,12 +97,11 @@ acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
if (ACPI_SUCCESS(status)) {
if (address64.resource_type == ACPI_MEMORY_RANGE) {
/* Populate the structure */
- mem_device->caching =
- address64.info.mem.caching;
+ mem_device->caching = address64.info.mem.caching;
mem_device->write_protect =
address64.info.mem.write_protect;
mem_device->start_addr = address64.minimum;
- mem_device->end_addr = address64.maximum;
+ mem_device->length = address64.address_length;
}
}
@@ -199,8 +198,7 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
* Tell the VM there is more memory here...
* Note: Assume that this function returns zero on success
*/
- result = add_memory(mem_device->start_addr,
- (mem_device->end_addr - mem_device->start_addr) + 1);
+ result = add_memory(mem_device->start_addr, mem_device->length);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "\nadd_memory failed\n"));
mem_device->state = MEMORY_INVALID_STATE;
@@ -249,7 +247,7 @@ static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
{
int result;
u64 start = mem_device->start_addr;
- u64 len = mem_device->end_addr - start + 1;
+ u64 len = mem_device->length;
ACPI_FUNCTION_TRACE("acpi_memory_disable_device");