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-rw-r--r--drivers/base/memory.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 63c2560..5185bcf 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -27,6 +27,8 @@
#include <asm/atomic.h>
#include <asm/uaccess.h>
+static DEFINE_MUTEX(mem_sysfs_mutex);
+
#define MEMORY_CLASS_NAME "memory"
static struct sysdev_class memory_sysdev_class = {
@@ -484,6 +486,8 @@ static int add_memory_block(int nid, struct mem_section *section,
if (!mem)
return -ENOMEM;
+ mutex_lock(&mem_sysfs_mutex);
+
mem->phys_index = __section_nr(section);
mem->state = state;
mutex_init(&mem->state_mutex);
@@ -504,6 +508,7 @@ static int add_memory_block(int nid, struct mem_section *section,
ret = register_mem_sect_under_node(mem, nid);
}
+ mutex_unlock(&mem_sysfs_mutex);
return ret;
}
@@ -512,6 +517,7 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
{
struct memory_block *mem;
+ mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
unregister_mem_sect_under_nodes(mem);
mem_remove_simple_file(mem, phys_index);
@@ -520,6 +526,7 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
mem_remove_simple_file(mem, removable);
unregister_memory(mem, section);
+ mutex_unlock(&mem_sysfs_mutex);
return 0;
}
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