On Thu, May 6, 2010 at 7:52 AM, Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx> wrote: > On Wed, May 5, 2010 at 12:26 PM, Yegor Yefremov > <yegorslists@xxxxxxxxxxxxxx> wrote: >> I'm using kernel 2.6.33.2 with AR2413 WLAN card. Issuing >> >> iwconfig wlan0 txpower off >> >> turns txpower off. I can see this status by iwconfig wlan0 and the >> communication with AP terminates. But when I turn the txpower on >> >> iwconfig wlan0 txpower on >> >> nothing happens. Though iwconfig shows the previous tx power value. >> Only ifconfig wlan0 down and then up recovers the transmission. >> >> Is it a known bug or I'm doing something wrong? > > I made some debugging and found out that after iwconfig wlan0 txpower > off dev_close() will be invoked, so that local->open_count will be 0. > The next time txpower on will be called, it will be checked if > local->open_count > 0 and this conditions fails, so no hardware > configuration will be made. > > I've made a quick and dirty hack, that opens the wireless device by > enabling the txpower, if it was closed before. Is there any proper > solution? Is it really necessary to close device to tunr txpower off? Depends on the type of interfaces you have. For a monitor device it makes no sense to close the device as you should be able to still RX. It also is possible to TX over a monitor device using frame injection so technically setting tx power to off would just mute it and would seem useful. Luis -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
