Commits on Jul 1, 2019

1. Bluetooth: Add dedicated pool for HCI_Num_Completed_Packets HCI event …

   This event is a priority one, so it's not safe to have it use the RX
   buffer pool which may be depleted due to non-priority events (e.g.
   advertising events). Since the event is consumed synchronously it's
   safe to have a single-buffer pool for it. Also introduce a new
   bt_buf_get_evt() API for HCI drivers to simplify the driver-side code,
   this effectively also deprecates bt_buf_get_cmd_complete() which now
   has no in-tree HCI driver users anymore.
   
   Fixes zephyrproject-rtos#16864
   
   Signed-off-by: Johan Hedberg <[email protected]>

   Johan Hedberg committed Jul 1, 2019
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2. Bluetooth: Introduce separate pool for discardable events …

   Introduce a separate buffer pool for events which the HCI driver
   considers discardable. Examples of such events could be e.g.
   Advertising Reports. The benefit of having such a pool means that the
   if there is a heavy inflow of such events it will not cause the
   allocation for other critical events to block and may even eliminate
   deadlocks in some cases.
   
   Also update all mesh samples not to specify explicit RX buffer counts
   anymore. Instead, create appropriate defaults in Kconfig so that we
   only need to override this in the app for cases like the bbc:microbit
   with limited memory.
   
   Signed-off-by: Johan Hedberg <[email protected]>

   Johan Hedberg committed Jul 1, 2019
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