Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.4 77/99] sunrpc: clarify comments on rpc_make_runnable | Date | Fri, 7 Mar 2014 17:08:13 -0800 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Jeff Layton <jlayton@redhat.com>
commit 506026c3ec270e18402f0c9d33fee37482c23861 upstream.
rpc_make_runnable is not generally called with the queue lock held, unless it's waking up a task that has been sitting on a waitqueue. This is safe when the task has not entered the FSM yet, but the comments don't really spell this out.
Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Cc: Weng Meiling <wengmeiling.weng@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- net/sunrpc/sched.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -302,8 +302,9 @@ EXPORT_SYMBOL_GPL(__rpc_wait_for_complet /* * Make an RPC task runnable. * - * Note: If the task is ASYNC, this must be called with - * the spinlock held to protect the wait queue operation. + * Note: If the task is ASYNC, and is being made runnable after sitting on an + * rpc_wait_queue, this must be called with the queue spinlock held to protect + * the wait queue operation. */ static void rpc_make_runnable(struct rpc_task *task) {
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