[ath9k-devel] [PATCH 09/10] ath10k: handle hw reconfiguration properly

[Michal Kazior <michal.kazior@tieto.com>]

On 10/06/13 19:08, Kalle Valo wrote:
> Michal Kazior <michal.kazior@tieto.com> writes:
>
>> If resume fails mac80211 calls start() hook
>> without any other notification to the driver.
>>
>> If that happens we must make sure we free up and
>> clean up our stuff.
>>
>> Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
>> ---
>>   drivers/net/wireless/ath/ath10k/mac.c |    9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
>> index 06601f5..fee4082 100644
>> --- a/drivers/net/wireless/ath/ath10k/mac.c
>> +++ b/drivers/net/wireless/ath/ath10k/mac.c
>> @@ -1694,11 +1694,20 @@ static void ath10k_tx(struct ieee80211_hw *hw,
>>   /*
>>    * Initialize various parameters with default vaules.
>>    */
>> +static void ath10k_stop(struct ieee80211_hw *hw);
>> +
>>   static int ath10k_start(struct ieee80211_hw *hw)
>>   {
>>   	struct ath10k *ar = hw->priv;
>>   	int ret;
>>
>> +	if (ar->started) {
>> +		/* This can be called in case if resume fails or
>> +		 * ieee80211_hw_restart() was issued */
>> +		ath10k_info("hw reconfiguration started\n");
>> +		ath10k_stop(hw);
>> +	}
>
> This look suspicious to me. Can you describe in detail the failing
> resume case, please?

If resume fails mac80211 behaves as if ieee80211_restart_hw() is called, 
i.e. it calls start() hook and proceeds with ressurecting STAs, 
interfaces, keys.


> If the idea is to initialise the hardware to a pristine state that we
> can boot the firmware, please refactor the code into it's own function.
> This just looks wrong.

This is more or less what I've done but haven't uploaded yet (since I'm 
still doing some tweaks/fixes).

Thanks for the review!


-- Pozdrawiam / Best regards, Michal Kazior.