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authorNathan Fontenot <nfont@austin.ibm.com>2010-10-19 12:45:24 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 10:16:44 -0700
commit2938ffbd466d2811a6012609684a2298eef35065 (patch)
tree3d4d0209d71481e329eb68f0d82afe585b6a5da2 /drivers/base/memory.c
parente4619c857d1d769b1172a75ba6b6ebd1186a9c58 (diff)
downloadop-kernel-dev-2938ffbd466d2811a6012609684a2298eef35065.zip
op-kernel-dev-2938ffbd466d2811a6012609684a2298eef35065.tar.gz
Driver core: Add mutex for adding/removing memory blocks
Add a new mutex for use in adding and removing of memory blocks. This is needed to avoid any race conditions in which the same memory block could be added and removed at the same time. Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com> Reviewed-by: Robin Holt <holt@sgi.com> Reviewed-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/memory.c')
-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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