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xsk: avoid store-tearing when assigning queues

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Use WRITE_ONCE when doing the store of tx, rx, fq, and cq, to avoid
potential store-tearing. These members are read outside of the control
mutex in the mmap implementation.

Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Fixes: 37b076933a ("xsk: add missing write- and data-dependency barrier")
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Björn Töpel 2019-09-04 13:49:10 +02:00 committed by Daniel Borkmann
parent 310f4204ee
commit 94a997637c
1 changed files with 1 additions and 1 deletions
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2
net/xdp/xsk.c
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@ -434,7 +434,7 @@ static int xsk_init_queue(u32 entries, struct xsk_queue **queue,
/* Make sure queue is ready before it can be seen by others */
smp_wmb();
*queue = q;
WRITE_ONCE(*queue, q);
return 0;
}