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

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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>
This commit is contained in:
Moni Shoua 2019-02-17 16:08:24 +02:00 committed by Jason Gunthorpe
parent 81dd4c4be3
commit 4438ee3f13
1 changed files with 1 additions and 1 deletions
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drivers/infiniband/core/umem_odp.c
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@ -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;
}