On Wed, May 16, 2018 at 7:14 AM, Jason Gunthorpe <[email protected]> wrote: > 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 <[email protected]> >> --- >> [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.
OK, I will submit a patch for this. > > Jason
