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platform_kernel-5.15
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drivers: base: move mutex lock out of add_memory_section() 

There is no point in releasing the mutex for each section that is added
during boot time.  Just hold it over the entire initialization loop.

Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Seth Jennings 2013-08-20 12:12:57 -05:00 committed by Greg Kroah-Hartman
parent 65f4467958
commit b1eaef3da5
1 changed files with 9 additions and 4 deletions
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13
drivers/base/memory.c
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@ -613,8 +613,6 @@ static int add_memory_section(int nid, struct mem_section *section,
int scn_nr = __section_nr(section); int scn_nr = __section_nr(section);
int ret = 0; int ret = 0;
mutex_lock(&mem_sysfs_mutex);
if (context == BOOT) { if (context == BOOT) {
/* same memory block ? */ /* same memory block ? */
if (mem_p && *mem_p) if (mem_p && *mem_p)
@ -643,7 +641,6 @@ static int add_memory_section(int nid, struct mem_section *section,
ret = register_mem_sect_under_node(mem, nid); ret = register_mem_sect_under_node(mem, nid);
} }
mutex_unlock(&mem_sysfs_mutex);
return ret; return ret;
} }
@ -653,7 +650,13 @@ static int add_memory_section(int nid, struct mem_section *section,
*/ */
int register_new_memory(int nid, struct mem_section *section) int register_new_memory(int nid, struct mem_section *section)
{ {
return add_memory_section(nid, section, NULL, MEM_OFFLINE, HOTPLUG); int ret;
mutex_lock(&mem_sysfs_mutex);
ret = add_memory_section(nid, section, NULL, MEM_OFFLINE, HOTPLUG);
mutex_unlock(&mem_sysfs_mutex);
return ret;
} }
#ifdef CONFIG_MEMORY_HOTREMOVE #ifdef CONFIG_MEMORY_HOTREMOVE
@ -746,6 +749,7 @@ int __init memory_dev_init(void)
* Create entries for memory sections that were found * Create entries for memory sections that were found
* during boot and have been initialized * during boot and have been initialized
*/ */
mutex_lock(&mem_sysfs_mutex);
for (i = 0; i < NR_MEM_SECTIONS; i++) { for (i = 0; i < NR_MEM_SECTIONS; i++) {
if (!present_section_nr(i)) if (!present_section_nr(i))
continue; continue;
@ -757,6 +761,7 @@ int __init memory_dev_init(void)
if (!ret) if (!ret)
ret = err; ret = err;
} }
mutex_unlock(&mem_sysfs_mutex);
out: out:
if (ret) if (ret)