Re: [PATCH] wifi: iwlwifi: mld: stop mac80211 TX queues on firmware error

[Johannes Berg]

On Fri, 2026-02-13 at 23:07 -0700, Cole Leavitt wrote:
> When firmware encounters an error in the iwlmld driver, nothing prevents
> mac80211 from continuing to feed TX packets. The mvm driver uses atomic
> status bits (IWL_MVM_STATUS_HW_RESTART_REQUESTED) checked in its TX path
> to gate transmissions, but the mld driver has no equivalent check --
> iwl_mld_tx_from_txq() only checks mld_txq->status.stop_full.
> 
> This allows TX to proceed while firmware is unresponsive, causing
> spinlock contention and soft lockups lasting 22-26 seconds.
> 
> Add ieee80211_stop_queues()

Using stop_queues()/wake_queues() seems a bit awkward, that API doesn't
interact all that well with the TXQ-based APIs that we use in this
driver. Shouldn't it just stop pulling from the TXQs in that case?

johannes