2010/4/20 Sujith <Sujith.Manoharan@xxxxxxxxxxx>: > tom.leiming@xxxxxxxxx wrote: >> This patch detects the disconnect in wmi register write path, >> then speedup the disconnect handling. > > What bug does this fix ? Submission of URBs in the REGOUT pipe > should not really fail, and if it does, it is indicative of a deeper > problem and recovery mechanisms are needed. After the 9271 device is unplugged, you will find your machine hung for several hundreds of milliseconds. > > If you do get WMI failures, can you post the relevant sections > from the kernel log ? If ATH_DBG_RESET is enabled, you will find the debug messages below[1] during disconnecting. From the messages, the short hang should be caused by the 'RTC stuck in MAC reset'. Once the patch is applied, no such issue will happen. [1], debug messages during 9287 disconnecting [12873.291066] usb 2-1.3: USB disconnect, address 15 [12873.291800] device: 'ep_01': device_unregister [12873.291809] PM: Removing info for No Bus:ep_01 [12873.292465] device: 'ep_82': device_unregister [12873.292472] PM: Removing info for No Bus:ep_82 [12873.292654] device: 'ep_83': device_unregister [12873.292661] PM: Removing info for No Bus:ep_83 [12873.292828] device: 'ep_04': device_unregister [12873.292834] PM: Removing info for No Bus:ep_04 [12873.292999] device: 'ep_05': device_unregister [12873.293431] PM: Removing info for No Bus:ep_05 [12873.293612] device: 'ep_06': device_unregister [12873.293689] PM: Removing info for No Bus:ep_06 [12873.293868] PM: Removing info for usb:2-1.3:1.0 [12873.294338] bus: 'usb': remove device 2-1.3:1.0 [12873.294373] usb 2-1.3: __pm_runtime_resume()! [12873.294380] usb 2-1.3: __pm_runtime_resume() returns 1! [12873.294392] device: 'ath9k-phy12::assoc': device_unregister [12873.294399] PM: Removing info for No Bus:ath9k-phy12::assoc [12873.294732] device: 'ath9k-phy12::assoc': device_create_release [12873.294771] device: 'ath9k-phy12::tx': device_unregister [12873.294778] PM: Removing info for No Bus:ath9k-phy12::tx [12873.295676] device: 'ath9k-phy12::tx': device_create_release [12873.295718] device: 'ath9k-phy12::rx': device_unregister [12873.295725] PM: Removing info for No Bus:ath9k-phy12::rx [12873.296316] device: 'ath9k-phy12::rx': device_create_release [12873.296351] device: 'ath9k-phy12::radio': device_unregister [12873.296358] PM: Removing info for No Bus:ath9k-phy12::radio [12873.296701] device: 'ath9k-phy12::radio': device_create_release [12874.349767] ath: timeout (100000 us) on reg 0x7000: 0xfffffffb & 0x00000003 != 0x00000000 [12874.349774] ath: RTC stuck in MAC reset [12874.349777] ath: Chip reset failed [12874.349779] ath: Unable to reset channel (2437 Mhz) reset status -22 [12874.349784] ath: Unable to set channel [12874.349939] ath: ah->misc_mode 0x4 [12874.350750] ath: Unable to remove station entry for: 00:03:7f:13:02:d3 [12874.352092] phy12: Removed STA 00:03:7f:13:02:d3 [12874.352224] phy12: Destroyed STA 00:03:7f:13:02:d3 [12874.352232] wlan14: deauthenticating from 00:03:7f:13:02:d3 by local choice (reason=3) [12874.352494] phy12: device now idle [12875.177375] ath: timeout (100000 us) on reg 0x7000: 0xfffffffb & 0x00000003 != 0x00000000 [12875.177382] ath: RTC stuck in MAC reset [12875.988627] ath: timeout (100000 us) on reg 0x7000: 0xfffffffb & 0x00000003 != 0x00000000 [12875.988633] ath: RTC stuck in MAC reset [12875.988638] ath: AWAKE -> FULL-SLEEP [12876.000157] PM: Removing info for No Bus:wlan14 [12876.005146] cfg80211: All devices are disconnected, going to restore regulatory settings [12876.005157] cfg80211: Restoring regulatory settings [12876.005175] cfg80211: Calling CRDA to update world regulatory domain [12876.006494] PM: Removing info for No Bus:rfkill13 [12876.013231] PM: Removing info for No Bus:phy12 [12876.026482] usb 2-1.3: ath9k_htc: USB layer deinitialized [12876.027680] device: 'ep_00': device_unregister [12876.027684] PM: Removing info for No Bus:ep_00 [12876.027781] PM: Removing info for usb:2-1.3 [12876.029678] bus: 'usb': remove device 2-1.3 [12876.045047] cfg80211: World regulatory domain updated: [12876.045051] (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) [12876.045054] (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [12876.045057] (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) [12876.045060] (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) [12876.045062] (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [12876.045065] (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [12876.144805] hub 2-1:1.0: __pm_runtime_suspend()! [12876.144832] hub 2-1:1.0: __pm_runtime_suspend() returns 0! [12878.705219] usb 2-1: __pm_runtime_suspend() from workqueue! [12878.716694] usb 2-1: __pm_runtime_suspend() returns 0! [12881.705105] usb usb2: __pm_runtime_suspend() from workqueue! [12881.705175] usb usb2: __pm_runtime_suspend() returns 0! -- Lei Ming -- 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
