diff options
authorJ. Bruce Fields <bfields@redhat.com>2013-02-10 11:33:48 -0500
committerJ. Bruce Fields <bfields@redhat.com>2013-02-17 10:53:16 -0500
commite75bafbff2270993926abcc31358361db74a9bc2 (patch)
parentf25cc71e634edcf8a15bc60a48f2b5f3ec9fbb1d (diff)
svcrpc: make svc_age_temp_xprts enqueue under sv_lock
svc_age_temp_xprts expires xprts in a two-step process: first it takes the sv_lock and moves the xprts to expire off their server-wide list (sv_tempsocks or sv_permsocks) to a local list. Then it drops the sv_lock and enqueues and puts each one. I see no reason for this: svc_xprt_enqueue() will take sp_lock, but the sv_lock and sp_lock are not otherwise nested anywhere (and documentation at the top of this file claims it's correct to nest these with sp_lock inside.) Cc: stable@kernel.org Tested-by: Jason Tibbitts <tibbs@math.uh.edu> Tested-by: PaweĊ‚ Sikora <pawel.sikora@agmk.net> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
1 files changed, 2 insertions, 13 deletions
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 5a9d40c5a9f3..11a33c874848 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -863,7 +863,6 @@ static void svc_age_temp_xprts(unsigned long closure)
struct svc_serv *serv = (struct svc_serv *)closure;
struct svc_xprt *xprt;
struct list_head *le, *next;
- LIST_HEAD(to_be_aged);
@@ -884,25 +883,15 @@ static void svc_age_temp_xprts(unsigned long closure)
if (atomic_read(&xprt->xpt_ref.refcount) > 1 ||
test_bit(XPT_BUSY, &xprt->xpt_flags))
- svc_xprt_get(xprt);
- list_move(le, &to_be_aged);
+ list_del_init(le);
set_bit(XPT_CLOSE, &xprt->xpt_flags);
set_bit(XPT_DETACHED, &xprt->xpt_flags);
- }
- spin_unlock_bh(&serv->sv_lock);
- while (!list_empty(&to_be_aged)) {
- le = to_be_aged.next;
- /* fiddling the xpt_list node is safe 'cos we're XPT_DETACHED */
- list_del_init(le);
- xprt = list_entry(le, struct svc_xprt, xpt_list);
dprintk("queuing xprt %p for closing\n", xprt);
/* a thread will dequeue and close it soon */
- svc_xprt_put(xprt);
+ spin_unlock_bh(&serv->sv_lock);
mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ);

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