Merge branch 'af_xdp-fixes'

Magnus Karlsson says:

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This patch set fixes three bugs in the SKB TX path of AF_XDP.
Details in the individual commits.

The structure of the patch set is as follows:

Patch 1: Fix for lost completion message
Patch 2-3: Fix for possible multiple completions of single packet
Patch 4: Fix potential race during error

Changes from v1:

* Added explanation of race in commit message of patch 4.
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Signed-off-by: Alexei Starovoitov <ast@kernel.org>