netdev - Re: [PATCH v5.1-rc] iwlwifi: make locking in iwl_mvm_tx

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Date:   Tue, 01 Oct 2019 11:46:17 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5.1-rc] iwlwifi: make locking in iwl_mvm_tx_mpdu()
 BH-safe

Hi Jiri,

Sorry for the long delay.

>  CPU: 1 PID: 28401 Comm: kworker/u8:2 Tainted: G        W         5.3.0-rc8 #3
>  Hardware name: LENOVO 20K5S22R00/20K5S22R00, BIOS R0IET38W (1.16 ) 05/31/2017
>  Workqueue: phy0 ieee80211_beacon_connection_loss_work [mac80211]
>  Call Trace:
>   dump_stack+0x78/0xb3
>   mark_lock+0x28a/0x2a0
>   __lock_acquire+0x568/0x1020
>   ? iwl_mvm_set_tx_cmd+0x1c5/0x400 [iwlmvm]
>   lock_acquire+0xbd/0x1e0
>   ? iwl_mvm_tx_mpdu+0xae/0x600 [iwlmvm]
>   _raw_spin_lock+0x35/0x50
>   ? iwl_mvm_tx_mpdu+0xae/0x600 [iwlmvm]
>   iwl_mvm_tx_mpdu+0xae/0x600 [iwlmvm]
>   ? ieee80211_tx_h_select_key+0xf1/0x4a0 [mac80211]
>   iwl_mvm_tx_skb+0x1f8/0x460 [iwlmvm]
>   iwl_mvm_mac_itxq_xmit+0xcc/0x200 [iwlmvm]
>   ? iwl_mvm_mac_itxq_xmit+0x55/0x200 [iwlmvm]
>   _ieee80211_wake_txqs+0x2cf/0x660 [mac80211]
>   ? _ieee80211_wake_txqs+0x5/0x660 [mac80211]
>   ? __ieee80211_wake_queue+0x219/0x340 [mac80211]
>   ieee80211_wake_queues_by_reason+0x64/0xa0 [mac80211]
> 

I'm a bit confused by this.

ieee80211_wake_queues_by_reason() does
spin_lock_irqsave()/spin_unlock_irqrestore() - why is that "{SOFTIRQ-ON-
W} usage"?

Or what did you snip?

johannes