From aab407fc5c0ce63e9fd4a34a790d7290d3e116a1 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 29 Sep 2013 10:59:59 -0400 Subject: don't bother with vfsmount_lock in mounts_poll() wake_up_interruptible/poll_wait provide sufficient barriers; just use ACCESS_ONCE() to fetch ns->event and that's it. Signed-off-by: Al Viro --- fs/proc_namespace.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'fs/proc_namespace.c') diff --git a/fs/proc_namespace.c b/fs/proc_namespace.c index 5fe34c355e85..439406e081af 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; } -- cgit v1.2.3