Commit bd174fc2 authored Apr 05, 2017 by Artemy Kovalyov Committed by Doug Ledford Apr 25, 2017

IB/mlx5: Fix function updating xlt emergency path



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: 7d0cc6ed ('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>

parent 3e7e1193

drivers/infiniband/hw/mlx5/mr.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1009,7 +1009,7 @@ int mlx5_ib_update_xlt(struct mlx5_ib_mr *mr, u64 idx, int npages,
		}

		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;

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