diff options
Diffstat (limited to 'drivers/infiniband/core/counters.c')
| -rw-r--r-- | drivers/infiniband/core/counters.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/infiniband/core/counters.c b/drivers/infiniband/core/counters.c index 12ba2685abcf..8434ec082c3a 100644 --- a/drivers/infiniband/core/counters.c +++ b/drivers/infiniband/core/counters.c @@ -149,8 +149,18 @@ static bool auto_mode_match(struct ib_qp *qp, struct rdma_counter *counter, struct auto_mode_param *param = &counter->mode.param; bool match = true; - /* Ensure that counter belongs to the right PID */ - if (task_pid_nr(counter->res.task) != task_pid_nr(qp->res.task)) + /* + * Ensure that counter belongs to the right PID. This operation can + * race with user space which kills the process and leaves QP and + * counters orphans. + * + * It is not a big deal because exitted task will leave both QP and + * counter in the same bucket of zombie process. Just ensure that + * process is still alive before procedding. + * + */ + if (task_pid_nr(counter->res.task) != task_pid_nr(qp->res.task) || + !task_pid_nr(qp->res.task)) return false; if (auto_mask & RDMA_COUNTER_MASK_QP_TYPE) |