[PATCH net-next v3 0/4] Couple of BPF refcount fixes for mlx5

[Daniel Borkmann <daniel@iogearbox.net>]

Various mlx5 bugs on eBPF refcount handling found during review.
Last patch in series adds a __must_check to BPF helpers to make
sure we won't run into it again w/o compiler complaining first.

v2 -> v3:

 - Just reworked patch 2/4 so we don't need bpf_prog_sub().
 - Rebased, rest as is.

v1 -> v2:

 - After discussion with Alexei, we agreed upon rebasing the
   patches against net-next.
 - Since net-next, I've also added the __must_check to enforce
   future users to check for errors.
 - Fixed up commit message #2.
 - Simplify assignment from patch #1 based on Saeed's feedback
   on previous set.

Thanks a lot!

Daniel Borkmann (4):
  bpf, mlx5: fix mlx5e_create_rq taking reference on prog
  bpf, mlx5: fix various refcount issues in mlx5e_xdp_set
  bpf, mlx5: drop priv->xdp_prog reference on netdev cleanup
  bpf: add __must_check attributes to refcount manipulating helpers

 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 33 +++++++++++++++++------
 include/linux/bpf.h                               | 12 +++++----
 kernel/bpf/syscall.c                              |  1 +
 3 files changed, 33 insertions(+), 13 deletions(-)

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1.9.3