Search Linux Wireless

Re: [PATCH v4 1/2] ath10k: add refcount for ath10k_core_restart

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2020-08-15 01:19, Kalle Valo wrote:
...

I have been thinking a different approach for this. I think another
option is to have a function like this:

ath10k_core_firmware_crashed()
{
        queue_work(ar->workqueue, &ar->restart_work);
}

In patch 1 we would convert all existing callers to call that
function instead of queue_work() directly.

In patch 2 we would add a new flag to enum ath10k_dev_flags, or maybe
should actually use existing ATH10K_FLAG_CRASH_FLUSH? Don't know yet
which one is better. Now the function would do:

ath10k_core_firmware_crashed()
{
        if (test_bit(flag))
                return

        set_bit(flag)
	queue_work(ar->workqueue, &ar->restart_work);
}

It is better to clear_bit ATH10K_FLAG_CRASH_FLUSH/new flag in ath10k_reconfig_complete instead of ath10k_core_start because ieee80211_reconfig(called by ieee80211_restart_work) of mac80211 do many things and drv_start is 1st thing and drv_reconfig_complete is last thing.

That way restart_work queue would be called only one time.

Though I'm not sure how ATH10K_STATE_WEDGED would behave after this
change, it might get broken. Ah, actually I think even this patch breaks the WEDGED state. This firmware restart is tricky, difficult to say what
is the best approach. Michal, are you reading? :) Any ideas?

And after looking more about this patch I don't see the need for the new
ar->restart_count atomic variable. Checking for ATH10K_FLAG_CRASH_FLUSH
would do the same thing AFAICS.

And related to this, (in a separate patch) I think we should utilise
ATH10K_FLAG_CRASH_FLUSH more. For example in ath10k_wmi_cmd_send() to
not even try to send a WMI command if the flag is set. Basically all
hardware access should be disabled except what is needed to restart the
firmware.



[Index of Archives]     [Linux Host AP]     [ATH6KL]     [Linux Wireless Personal Area Network]     [Linux Bluetooth]     [Wireless Regulations]     [Linux Netdev]     [Kernel Newbies]     [Linux Kernel]     [IDE]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite Hiking]     [MIPS Linux]     [ARM Linux]     [Linux RAID]

  Powered by Linux