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| author |   Nathan Fontenot <nfont@austin.ibm.com> | 2010-10-19 12:45:24 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:16:44 -0700 |
| commit | 2938ffbd466d2811a6012609684a2298eef35065 (patch) | |
| tree | 3d4d0209d71481e329eb68f0d82afe585b6a5da2 /drivers/base | |
| parent | Driver core: Move find_memory_block routine (diff) | |
| download | linux-dev-2938ffbd466d2811a6012609684a2298eef35065.tar.xz linux-dev-2938ffbd466d2811a6012609684a2298eef35065.zip | |
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')
| -rw-r--r-- | drivers/base/memory.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 63c25601572d..5185bcff2de9 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; } |