Johannes Berg <johannes@xxxxxxxxxxxxxxxx> writes: > On Mon, 2020-04-06 at 15:52 +0300, Kalle Valo wrote: >> Johannes Berg <johannes@xxxxxxxxxxxxxxxx> writes: >> >> > On Mon, 2020-04-06 at 15:44 +0300, Kalle Valo wrote: >> > > > user-space ieee80211_register_hw() RX IRQ >> > > > +++++++++++++++++++++++++++++++++++++++++++++ >> > > > | | | >> > > > |<---wlan0---wiphy_register() | >> > > > |----start wlan0---->| | >> > > > | |<---IRQ---(RX packet) >> > > > | Kernel crash | >> > > > | due to unallocated | >> > > > | workqueue. | >> > >> > [snip] >> > >> > > I have understood that no frames should be received until mac80211 calls >> > > struct ieee80211_ops::start: >> > > >> > > * @start: Called before the first netdevice attached to the hardware >> > > * is enabled. This should turn on the hardware and must turn on >> > > * frame reception (for possibly enabled monitor interfaces.) >> > >> > True, but I think he's saying that you can actually add and configure an >> > interface as soon as the wiphy is registered? >> >> With '<---IRQ---(RX packet)' I assumed wcn36xx is delivering a frame to >> mac80211 using ieee80211_rx(), but of course I'm just guessing here. > > Yeah, but that could be legitimate? Ah, I misunderstood then. The way I have understood is that no rx frames should be delivered (= calling ieee80211_rx()_ before start() is called, but if that's not the case please ignore me :) -- https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
