On Tue, May 08, 2018 at 04:50:16PM +0800, Lidong Chen wrote: > The userspace may invoke ibv_reg_mr and ibv_dereg_mr by different threads. > If when ibv_dereg_mr invoke and the thread which invoked ibv_reg_mr has > exited, get_pid_task will return NULL, ib_umem_release does not decrease > mm->pinned_vm. This patch fixes it by use tgid in ib_ucontext struct. > > Signed-off-by: Lidong Chen <lidongchen@xxxxxxxxxxx> > --- > [v2] > - use ib_ucontext tgid instread of tgid in ib_umem structure > > drivers/infiniband/core/umem.c | 7 +------ > include/rdma/ib_umem.h | 1 - > 2 files changed, 1 insertion(+), 7 deletions(-) Applied to for-rc, thanks. It would be nice to send a cleanup to have all the users of tgid doing this pattern task = get_pid_task(umem->context->tgid, PIDTYPE_PID); if (!task) goto out; mm = get_task_mm(task); To call some kind of common function like ib_get_mr_mm(), just to make it really clear what is happening. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
