[riot-notifications] [RIOT-OS/RIOT] Pr/fix gnrc pktq (#15435)

José Alamos notifications at github.com
Thu Nov 12 16:38:03 CET 2020

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### Contribution description
This PR fixes a pktbuf leak when using `gnrc_netif_pktq`. There was a missing `gnrc_pktbuf_release(pkt)` when the device was busy AND the pkt queue was full.
It also adds dequeue events for `NETDEV_EVENT_TX_COMPLETE_DATA_PENDING` and `NETDEV_EVENT_TX_NOACK`, which are already present when using `netdev_ieee802154_submac`
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### Testing procedure
Doing stress ping would leak the packet buffer (even if the address doesn't exist):
ping fe80::212:4b00:60d:61dd -s 1100 -i 0 -c 200

With this PR, there shouldn't be pktbuf leaks even under stress conditions.
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### Issues/PRs references
None so far
Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * gnrc_netif: add missing netdev events
  * gnrc_netif: add missing pktbuf release

-- File Changes --

    M sys/net/gnrc/netif/gnrc_netif.c (5)

-- Patch Links --


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