Hello Franky Lin,
The patch b948a85c1f26: "brcm80211: fmac: fix missing completion
events issue" from Apr 23, 2012, leads to the following Smatch warning:
drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c:2650
brcmf_sdbrcm_dpc_thread()
error: double unlock 'spin_lock:&bus->dpc_tl_lock'
2631
2632 spin_lock_irqsave(&bus->dpc_tl_lock, flags);
2633 list_for_each_safe(cur_hd, tmp_hd, &bus->dpc_tsklst) {
2634 spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
2635
2636 if (bus->sdiodev->bus_if->state == BRCMF_BUS_DOWN) {
2637 /* after stopping the bus, exit thread */
2638 brcmf_sdbrcm_bus_stop(bus->sdiodev->dev);
2639 bus->dpc_tsk = NULL;
2640 break;
^^^^^^
We are not holding the lock here.
2641 }
2642
2643 if (brcmf_sdbrcm_dpc(bus))
2644 brcmf_sdbrcm_adddpctsk(bus);
2645
2646 spin_lock_irqsave(&bus->dpc_tl_lock, flags);
2647 list_del(cur_hd);
2648 kfree(cur_hd);
2649 }
2650 spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Double unlock. Double IRQ restore.
regards,
dan carpenter
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