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authorDavidlohr Bueso <dave@stgolabs.net>2017-11-17 15:31:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-17 16:10:04 -0800
commit39c96a1b96a5991b1c9e79b85a8d74ef93b36026 (patch)
tree5bd92209fad8d1a35f9a7720829204862ad29723 /ipc/sem.c
parentsysvipc: unteach ids->next_id for !CHECKPOINT_RESTORE (diff)
downloadlinux-dev-39c96a1b96a5991b1c9e79b85a8d74ef93b36026.tar.xz
linux-dev-39c96a1b96a5991b1c9e79b85a8d74ef93b36026.zip
sysvipc: duplicate lock comments wrt ipc_addid()
The comment in msgqueues when using ipc_addid() is quite useful imo. Duplicate it for shm and semaphores. Link: http://lkml.kernel.org/r/20170831172049.14576-3-dave@stgolabs.net Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Cc: Manfred Spraul <manfred@colorfullife.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/sem.c')
-rw-r--r--ipc/sem.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ipc/sem.c b/ipc/sem.c
index b2698ebdcb31..28a5c9f0be87 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -515,6 +515,7 @@ static int newary(struct ipc_namespace *ns, struct ipc_params *params)
sma->sem_nsems = nsems;
sma->sem_ctime = ktime_get_real_seconds();
+ /* ipc_addid() locks sma upon success. */
retval = ipc_addid(&sem_ids(ns), &sma->sem_perm, ns->sc_semmni);
if (retval < 0) {
call_rcu(&sma->sem_perm.rcu, sem_rcu_free);