Handle NL80211_CMD_SCAN_ABORTED command

[bmegli]

We should handle NL80211_CMD_SCAN_ABORTED command in notifications channel.

Otherwise we may have the following race condition:

• we read up notifications
• we trigger scan if necessary
• we wait for completion
• we collect results

It's possible that If the scan is aborted after triggering, before completion we may wait indefinitely for results. I am not sure, this needs investigation.

[nini-os]

Any hints on how to implement this? It is very useful.

[bmegli]

Probably in handle_NL80211_MULTICAST_GROUP_SCAN, the case for NL80211_CMD_SCAN_ABORTED.

This is called from two places:

• in non blocking readout of any pending notifications
• while waiting for scan results

Some logic could be added to either:

• (re)schedule scan
• or report error

I am not sure it is needed. Ideally a way to abort scan and check what happens would be handy.