Freeze when performing sudo iw dev wlan1 del

[marc-y-marc]

Branch: 5.3.4 (also tested the newer 5.6.x driver branch)
OS: Tested on Raspbian & Ubuntu

Steps to reproduce:

• Install driver on clean Raspbian or Ubuntu (18.04.2) use make install or dkpg (both tested)
• sudo iw dev wlan1 del

sudo / iw process will freeze. Only operation 'pull the plug' makes the raspberry pi3b+ live again. Killing the process will not work,

I've also tried using airmon-ng start / stop. That gave me the following:

You already have a wlan1 device but it is NOT in station mode.
Whatever you did, don't do it again.
Please run "iw wlan1 del" before attempting to continue

[marc-y-marc]

Related issue (which was closed but not solved): #227

[kimocoder]

Please use latest branch more less issues.