Re: [PATCH] mac80211: fix race in ieee80211_register_hw()

On Mon, 2020-04-06 at 19:55 +0530, Krishna Chaitanya wrote:

quoted

iw phy0 interface add wlan0 type station
ip link set wlan0 up

Ah okay, got it, thanks. Very narrow window though :-) as the
alloc_ordered_workqueue
doesn't need RTNL and there is a long way to go to do if_add() from
user and setup
the driver for interrupts. 

True, I do wonder how this is hit. Maybe something with no preempt and a
uevent triggering things?

Again depends on the driver though, it
should properly handle
pending ieee80211_register_hw() with start().

It could, but it'd be really tricky. Much better to fix mac80211.

johannes