On 06/19/2010 07:35 AM, Magnus Therning wrote: > 2010/6/19 Rafał Miłecki <zajec5@xxxxxxxxx>: >> You can Google for b43 & DMA errors. Simply try "pio" option for b43 >> module. Or switch to newer kernel, which will pick up pio for you >> after first DMA error. > > Given the following messages in dmesg, I thought this was already happening: > > b43-phy0 ERROR: Fatal DMA error: 0x00000800, 0x00000000, 0x00000000, > 0x00000000, 0x00000000, 0x00000000 > b43-phy0 ERROR: This device does not support DMA on your system. > Please use PIO instead. > b43-phy0: Controller RESET (DMA error) ... > b43-phy0: Loading firmware version 478.104 (2008-07-01 00:50:23) > b43-phy0: Controller restarted > > I'm running the 2.6.33 (latest stable is 2.6.34), but I am using the > latest daily (2010-06-17) from compat-wireless[1], so unless I'm > missing something there isn't much to be gained from switching to the > latest kernel. In any case I will try it to see if that improves the > situation. > > My naive reading of the messages tells me that this *isn't* a DMA > error... I also don't really understand how I could ever get an > initial connection, which I do, if that were the problem I'm having. No, it is a fatal DMA error and your device did switch to PIO mode. The dmesg output does not make that clear. I'm sending a patch to change the logged message. > It looks like the following is more relevant to my problem: > > No probe response from AP 00:22:3f:c3:99:a8 after 500ms, disconnecting. > cfg80211: Calling CRDA to update world regulatory domain > wlan0: authenticate with 00:22:3f:c3:99:a8 (try 1) > wlan0: authenticated > wlan0: associate with 00:22:3f:c3:99:a8 (try 1) > wlan0: RX AssocResp from 00:22:3f:c3:99:a8 (capab=0x431 status=0 aid=1) > wlan0: associated > wlan0: deauthenticated from 00:22:3f:c3:99:a8 (Reason: 15) > > Especially since that sequence of messages is repeated over an over. > > My next test will be to turn off all security on the wireless, just to > rule out WPA completley. I looked for an explanation of Reason 15 deauthentications. Perhaps someone on the wireless ML will know the answer. Larry -- 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
