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authorDavid Howells <dhowells@redhat.com>2019-05-30 13:40:24 +0300
committerDavid Howells <dhowells@redhat.com>2019-05-30 16:17:01 +0300
commit3be59f74512e37f4d4243a5d0831970e2a009206 (patch)
treeb643a7a19f9664c900ad092005879d4b783b1684 /security/keys
parent9fd165379eff957ec3a9f5059c9d5ed05e02e61a (diff)
downloadlinux-3be59f74512e37f4d4243a5d0831970e2a009206.tar.xz
keys: Change keyring_serialise_link_sem to a mutex
Change keyring_serialise_link_sem to a mutex as it's only ever write-locked. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'security/keys')
-rw-r--r--security/keys/keyring.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 5b218b270598..ca6694ba1773 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -100,7 +100,7 @@ EXPORT_SYMBOL(key_type_keyring);
* Semaphore to serialise link/link calls to prevent two link calls in parallel
* introducing a cycle.
*/
-static DECLARE_RWSEM(keyring_serialise_link_sem);
+static DEFINE_MUTEX(keyring_serialise_link_lock);
/*
* Publish the name of a keyring so that it can be found by name (if it has
@@ -1206,7 +1206,7 @@ int __key_link_begin(struct key *keyring,
const struct keyring_index_key *index_key,
struct assoc_array_edit **_edit)
__acquires(&keyring->sem)
- __acquires(&keyring_serialise_link_sem)
+ __acquires(&keyring_serialise_link_lock)
{
struct assoc_array_edit *edit;
int ret;
@@ -1228,7 +1228,7 @@ int __key_link_begin(struct key *keyring,
/* serialise link/link calls to prevent parallel calls causing a cycle
* when linking two keyring in opposite orders */
if (index_key->type == &key_type_keyring)
- down_write(&keyring_serialise_link_sem);
+ mutex_lock(&keyring_serialise_link_lock);
/* Create an edit script that will insert/replace the key in the
* keyring tree.
@@ -1260,7 +1260,7 @@ error_cancel:
assoc_array_cancel_edit(edit);
error_sem:
if (index_key->type == &key_type_keyring)
- up_write(&keyring_serialise_link_sem);
+ mutex_unlock(&keyring_serialise_link_lock);
error_krsem:
up_write(&keyring->sem);
kleave(" = %d", ret);
@@ -1307,13 +1307,13 @@ void __key_link_end(struct key *keyring,
const struct keyring_index_key *index_key,
struct assoc_array_edit *edit)
__releases(&keyring->sem)
- __releases(&keyring_serialise_link_sem)
+ __releases(&keyring_serialise_link_lock)
{
BUG_ON(index_key->type == NULL);
kenter("%d,%s,", keyring->serial, index_key->type->name);
if (index_key->type == &key_type_keyring)
- up_write(&keyring_serialise_link_sem);
+ mutex_unlock(&keyring_serialise_link_lock);
if (edit) {
if (!edit->dead_leaf) {