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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2013-03-25 19:23:40 +0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-04-10 06:20:02 +0400 |
| commit | 4e58995c3f1bedc7acfe5e2d2a9f7deebcbdb82f (patch) | |
| tree | a11fe1c6841c8df2db17e62c80c1a11065d78405 /net/sunrpc | |
| parent | 6273c03e47f9192594311b3d06601c695d2c7171 (diff) | |
| download | linux-4e58995c3f1bedc7acfe5e2d2a9f7deebcbdb82f.tar.xz | |
SUNRPC: Add barriers to ensure read ordering in rpc_wake_up_task_queue_locked
commit 1166fde6a923c30f4351515b6a9a1efc513e7d00 upstream.
We need to be careful when testing task->tk_waitqueue in
rpc_wake_up_task_queue_locked, because it can be changed while we
are holding the queue->lock.
By adding appropriate memory barriers, we can ensure that it is safe to
test task->tk_waitqueue for equality if the RPC_TASK_QUEUED bit is set.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/sched.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 18c5a5022210..dc6af2748e25 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -139,6 +139,8 @@ static void __rpc_add_wait_queue(struct rpc_wait_queue *queue, list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]); task->tk_waitqueue = queue; queue->qlen++; + /* barrier matches the read in rpc_wake_up_task_queue_locked() */ + smp_wmb(); rpc_set_queued(task); dprintk("RPC: %5u added to queue %p \"%s\"\n", @@ -389,8 +391,11 @@ static void __rpc_do_wake_up_task(struct rpc_wait_queue *queue, struct rpc_task */ static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct rpc_task *task) { - if (RPC_IS_QUEUED(task) && task->tk_waitqueue == queue) - __rpc_do_wake_up_task(queue, task); + if (RPC_IS_QUEUED(task)) { + smp_rmb(); + if (task->tk_waitqueue == queue) + __rpc_do_wake_up_task(queue, task); + } } /* |