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ACPI / memhotplug: don't allow to eject the memory device if it is being used

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We eject the memory device even if it is in use.  It is very dangerous,
and it will cause the kernel to be panicked.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Wen Congyang 2012-11-16 02:10:37 +01:00 committed by Rafael J. Wysocki
parent e0b7b24dd9
commit 6547947257
1 changed files with 33 additions and 9 deletions
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42
drivers/acpi/acpi_memhotplug.c
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@ -78,6 +78,7 @@ struct acpi_memory_info {
unsigned short caching; /* memory cache attribute */
unsigned short write_protect; /* memory read/write attribute */
unsigned int enabled:1;
unsigned int failed:1;
};
struct acpi_memory_device {
@ -257,9 +258,23 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
node = memory_add_physaddr_to_nid(info->start_addr);
result = add_memory(node, info->start_addr, info->length);
if (result)
/*
* If the memory block has been used by the kernel, add_memory()
* returns -EEXIST. If add_memory() returns the other error, it
* means that this memory block is not used by the kernel.
*/
if (result && result != -EEXIST) {
info->failed = 1;
continue;
info->enabled = 1;
}
if (!result)
info->enabled = 1;
/*
* Add num_enable even if add_memory() returns -EEXIST, so the
* device is bound to this driver.
*/
num_enabled++;
}
if (!num_enabled) {
@ -280,21 +295,30 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
{
int result;
int result = 0;
struct acpi_memory_info *info, *n;
list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
if (info->enabled) {
result = remove_memory(info->start_addr, info->length);
if (result)
return result;
}
if (info->failed)
/* The kernel does not use this memory block */
continue;
if (!info->enabled)
/*
* The kernel uses this memory block, but it may be not
* managed by us.
*/
return -EBUSY;
result = remove_memory(info->start_addr, info->length);
if (result)
return result;
list_del(&info->list);
kfree(info);
}
return 0;
return result;
}
static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)