tree e6d14d14aaed37a5bc28a8a6ebd952a7a42f9aa6
parent 774d5f14ee1ecac55f42a84ff35eb00b896b00b6
author Trond Myklebust <Trond.Myklebust@netapp.com> 1369241844 -0400
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1369248932 -0400

SUNRPC: Prevent an rpc_task wakeup race

The lockless RPC_IS_QUEUED() test in __rpc_execute means that we need to
be careful about ordering the calls to rpc_test_and_set_running(task) and
rpc_clear_queued(task). If we get the order wrong, then we may end up
testing the RPC_TASK_RUNNING flag after __rpc_execute() has looped
and changed the state of the rpc_task.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org