When multiple STA-PEERs are connected to SAP-DUT device and if SAP
is getting shutdown then as part of shutdown:
1) PEER delete happens first and as part of it,
firmware sends peer_unmap event in interrupt-context.
2) entire peer_unmap handling happens in interrupt_context on one
of the available CPU-core.
3) as part of peer_unmap handling, driver removes the peer from
peer_list first and then cleans up its peer data structure.
4) so between peer getting removed from peer_list and
peer data structure getting cleaned up;
control thread (hdd_vdev_destroy/IOCTL/mcthread),
which is running on different CPU core in process-context,
takes control.
5) control thread checks if peer_list is empty. If it is empty then
cleans dp_vdev structure.
6) so when interrupt_context is cleaning up peer data-structure queue,
it gets stability issue while accessing dp_vdev structure which is
already cleaned up by control thread.
Fix the situation by cleaning-up the peer data-struct first and
then remove peer from peer_list
CRs-Fixed: 2291861
Change-Id: I39675bbe4448df57911963942800cbcede508917
7c4565f22f