On Mon, Feb 03, 2020 at 08:31:10PM +0800, Frank Huang wrote: > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/infiniband/core/cma.c#n1832 > > /* > * Wait for any active callback to finish. New callbacks will find > * the id_priv state set to destroying and abort. > */ > mutex_lock(&id_priv->handler_mutex); > mutex_unlock(&id_priv->handler_mutex); > > It does nothing between the lock, what 's the meaning of it? It is a way to implement wait_for_completion paradigm, by ensuring that all cm_id works or will see RDMA_CM_DESTROYING state (they need to take handler_mutex, before every call to cma_exch), or will complete their execution and release handler_mutex. Thanks
