In memory shortage path we fall back to use spare buffer.
mlx5_ib_update_xlt() called from ib_uverbs_reg_mr when ibmr.ucontext
not initialized yet.
Scenario how to test it:
1. trigger memory exhaustion so __get_free_pages(GFP_KERNEL, 4) will fail
2. register MR
3. there should be no kernel oops
Fixes:
7d0cc6edcc70 ('IB/mlx5: Add MR cache for large UMR regions')
Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
}
if (!xlt) {
- uctx = to_mucontext(mr->ibmr.uobject->context);
+ uctx = to_mucontext(mr->ibmr.pd->uobject->context);
mlx5_ib_warn(dev, "Using XLT emergency buffer\n");
size = PAGE_SIZE;
xlt = (void *)uctx->upd_xlt_page;