[riot-notifications] [RIOT-OS/RIOT] at86rf2xx: do not try to send when device is busy (#11264)

Martine Lenders notifications at github.com
Mon Mar 25 17:02:27 CET 2019


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### Contribution description
Otherwise, a race condition might be triggered where data that was just
received (which is the reason the device might be busy) is overridden
by the sent data (see #11256).
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### Testing procedure
Run the tests in #11256 together with #11263 (I did not do this myself yet, this is why I marked it as WIP).
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### Issues/PRs references
This prevents the race condition show-cased in #11256.
Together with #11263 the sent packets are tried to be sent later instead of just being dropped.
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/11264

-- Commit Summary --

  * at86rf2xx: do not try to send when device is busy

-- File Changes --

    M drivers/at86rf2xx/at86rf2xx_netdev.c (12)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/11264.patch
https://github.com/RIOT-OS/RIOT/pull/11264.diff

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