xsk: add missing smp_rmb() in xsk_mmap

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All the setup code in AF_XDP is protected by a mutex with the
exception of the mmap code that cannot use it. To make sure that a
process banging on the mmap call at the same time as another process
is setting up the socket, smp_wmb() calls were added in the umem
registration code and the queue creation code, so that the published
structures that xsk_mmap needs would be consistent. However, the
corresponding smp_rmb() calls were not added to the xsk_mmap
code. This patch adds these calls.

Fixes: 37b076933a ("xsk: add missing write- and data-dependency barrier")
Fixes: c0c77d8fb7 ("xsk: add user memory registration support sockopt")
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Magnus Karlsson 2019-02-08 14:13:50 +01:00 • committed by Alexei Starovoitov

parent b90efd2258

commit e6762c8bcf

1 changed files with 4 additions and 0 deletions

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net/xdp/xsk.c

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