Commit 4438ee3f authored Feb 17, 2019 by Moni Shoua Committed by Jason Gunthorpe Feb 21, 2019

IB/core: Abort page fault handler silently during owning process exit

It is possible that during a page fault handling, the process that owns
the MR is terminating. The indication for it is failure to get the
task_struct or take reference on the mm_struct. In this case just abort
the page-fault handler with error but without a warning to the kernel log.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

parent 81dd4c4b

drivers/infiniband/core/umem_odp.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -618,7 +618,7 @@ int ib_umem_odp_map_dma_pages(struct ib_umem_odp *umem_odp, u64 user_virt,
		* mmget_not_zero will fail in this case.
		*/
		owning_process = get_pid_task(umem_odp->per_mm->tgid, PIDTYPE_PID);
		if (WARN_ON(!mmget_not_zero(umem_odp->umem.owning_mm))) {
		if (!owning_process \|\| !mmget_not_zero(owning_mm)) {
		ret = -EINVAL;
		goto out_put_task;
		}

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