diff options
| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2010-01-03 13:16:32 +0100 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2010-01-10 21:57:44 +0100 |
| commit | f737d95ddfea4df68a36ffc9231db4bf34b06d13 (patch) | |
| tree | 28a1bf737c96ba8048abcf87a7acfc8412e92a2e /security/tomoyo/common.c | |
| parent | TOMOYO: Use RCU primitives for list operation (diff) | |
| download | linux-f737d95ddfea4df68a36ffc9231db4bf34b06d13.tar.xz linux-f737d95ddfea4df68a36ffc9231db4bf34b06d13.zip | |
TOMOYO: Replace rw_semaphore by mutex.
Since readers no longer use down_read(), writers no longer
need to use rw_semaphore. Replace individual rw_semaphore by
single mutex.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/tomoyo/common.c')
| -rw-r--r-- | security/tomoyo/common.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c index f01b9364db2d..642e0e565dfc 100644 --- a/security/tomoyo/common.c +++ b/security/tomoyo/common.c @@ -16,6 +16,9 @@ #include "common.h" #include "tomoyo.h" +/* Lock for protecting policy. */ +DEFINE_MUTEX(tomoyo_policy_lock); + /* Has loading policy done? */ bool tomoyo_policy_loaded; @@ -1086,7 +1089,6 @@ struct tomoyo_policy_manager_entry { * # cat /sys/kernel/security/tomoyo/manager */ static LIST_HEAD(tomoyo_policy_manager_list); -static DECLARE_RWSEM(tomoyo_policy_manager_list_lock); /** * tomoyo_update_manager_entry - Add a manager entry. @@ -1118,7 +1120,7 @@ static int tomoyo_update_manager_entry(const char *manager, saved_manager = tomoyo_save_name(manager); if (!saved_manager) return -ENOMEM; - down_write(&tomoyo_policy_manager_list_lock); + mutex_lock(&tomoyo_policy_lock); list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { if (ptr->manager != saved_manager) continue; @@ -1138,7 +1140,7 @@ static int tomoyo_update_manager_entry(const char *manager, list_add_tail_rcu(&new_entry->list, &tomoyo_policy_manager_list); error = 0; out: - up_write(&tomoyo_policy_manager_list_lock); + mutex_unlock(&tomoyo_policy_lock); return error; } @@ -1315,7 +1317,7 @@ static int tomoyo_delete_domain(char *domainname) name.name = domainname; tomoyo_fill_path_info(&name); - down_write(&tomoyo_domain_list_lock); + mutex_lock(&tomoyo_policy_lock); /* Is there an active domain? */ list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { /* Never delete tomoyo_kernel_domain */ @@ -1327,7 +1329,7 @@ static int tomoyo_delete_domain(char *domainname) domain->is_deleted = true; break; } - up_write(&tomoyo_domain_list_lock); + mutex_unlock(&tomoyo_policy_lock); return 0; } |