diff options
Diffstat (limited to 'fs/proc_namespace.c')
| -rw-r--r-- | fs/proc_namespace.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/fs/proc_namespace.c b/fs/proc_namespace.c index 5fe34c355e8..1a81373947f 100644 --- a/fs/proc_namespace.c +++ b/fs/proc_namespace.c @@ -20,15 +20,15 @@ static unsigned mounts_poll(struct file *file, poll_table *wait) struct proc_mounts *p = proc_mounts(file->private_data); struct mnt_namespace *ns = p->ns; unsigned res = POLLIN | POLLRDNORM; + int event; poll_wait(file, &p->ns->poll, wait); - br_read_lock(&vfsmount_lock); - if (p->m.poll_event != ns->event) { - p->m.poll_event = ns->event; + event = ACCESS_ONCE(ns->event); + if (p->m.poll_event != event) { + p->m.poll_event = event; res |= POLLERR | POLLPRI; } - br_read_unlock(&vfsmount_lock); return res; } @@ -234,17 +234,12 @@ static int mounts_open_common(struct inode *inode, struct file *file, rcu_read_lock(); nsp = task_nsproxy(task); - if (!nsp) { + if (!nsp || !nsp->mnt_ns) { rcu_read_unlock(); put_task_struct(task); goto err; } ns = nsp->mnt_ns; - if (!ns) { - rcu_read_unlock(); - put_task_struct(task); - goto err; - } get_mnt_ns(ns); rcu_read_unlock(); task_lock(task); @@ -272,6 +267,7 @@ static int mounts_open_common(struct inode *inode, struct file *file, p->root = root; p->m.poll_event = ns->event; p->show = show; + p->cached_event = ~0ULL; return 0; |