Vasanthakumar Thiagarajan <vthiagar@xxxxxxxxxxxxxxxx> wrote: > arvifs list is traversed within data_lock spin_lock in tasklet > context to fill channel information from the corresponding vif. > This means any access to arvifs list for add/del operations > should also be protected with the same spin_lock to avoid the > race. Fix this by performing list add/del on arvfis within the > data_lock. This could fix kernel panic something like the below. > > LR is at ath10k_htt_rx_pktlog_completion_handler+0x100/0xb6c [ath10k_core] > PC is at ath10k_htt_rx_pktlog_completion_handler+0x1c0/0xb6c [ath10k_core] > Internal error: Oops: 17 [#1] PREEMPT SMP ARM > [<bf4857f4>] (ath10k_htt_rx_pktlog_completion_handler+0x2f4/0xb6c [ath10k_core]) > [<bf487540>] (ath10k_htt_txrx_compl_task+0x8b4/0x1188 [ath10k_core]) > [<c00312d4>] (tasklet_action+0x8c/0xec) > [<c00309a8>] (__do_softirq+0xdc/0x208) > [<c0030d6c>] (irq_exit+0x84/0xe0) > [<c005db04>] (__handle_domain_irq+0x80/0xa0) > [<c00085c4>] (gic_handle_irq+0x38/0x5c) > [<c0009640>] (__irq_svc+0x40/0x74) > > (gdb) list *(ath10k_htt_rx_pktlog_completion_handler+0x1c0) > 0x136c0 is in ath10k_htt_rx_h_channel (drivers/net/wireless/ath/ath10k/htt_rx.c:769) > 764 struct cfg80211_chan_def def; > 765 > 766 lockdep_assert_held(&ar->data_lock); > 767 > 768 list_for_each_entry(arvif, &ar->arvifs, list) { > 769 if (arvif->vdev_id == vdev_id && > 770 ath10k_mac_vif_chan(arvif->vif, &def) == 0) > 771 return def.chan; > 772 } > 773 > > Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@xxxxxxxxxxxxxxxx> Patch applied to ath-next branch of ath.git, thanks. ebaa4b1620bf ath10k: fix kernel panic due to race in accessing arvif list -- https://patchwork.kernel.org/patch/9369573/ Documentation about submitting wireless patches and checking status from patchwork: https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches