Jim Colton wrote:
> zd_chip_unlock_phy_regs() CR_REG1: 0x20 -> 0xa0
> Jul 11 13:31:35 river kernel: zd1211rw 1-1.1:1.0: bssinfo_change() 
> changes: 4
> Jul 11 13:31:38 river kernel: usb 1-1.1: handle_retry_failed_int() retry 
> failed interrupt
> Jul 11 13:31:38 river pumpd[4009]: got dhcp offer
> Jul 11 13:31:38 river pumpd[4009]: PUMP: sending second discover
> Jul 11 13:31:38 river pumpd[4009]: reject: xid: 0xfeff2d9e <--> 0xfeff2d9d
> Jul 11 13:31:38 river last message repeated 2 times
> Jul 11 13:31:38 river kernel: usb 1-1.1: handle_retry_failed_int() retry 
> failed interrupt
> Jul 11 13:31:38 river pumpd[4009]: PUMP: got an offer
> Jul 11 13:31:38 river pumpd[4009]: reject: xid: 0xfeff2d9f <--> 0xfeff2d9e
> Jul 11 13:31:38 river pumpd[4009]: PUMP: got lease
> Jul 11 13:31:38 river pumpd[4009]: intf: device: wlan0
> Jul 11 13:31:38 river pumpd[4009]: intf: set: 416
> Jul 11 13:31:38 river pumpd[4009]: intf: bootServer: 192.168.0.5 
> <http://192.168.0.5>
> Jul 11 13:31:38 river pumpd[4009]: intf: reqLease: 43200
> Jul 11 13:31:38 river pumpd[4009]: intf: ip: 192.168.0.102 
> <http://192.168.0.102>
> Jul 11 13:31:38 river pumpd[4009]: intf: next server: 0.0.0.0 
> <http://0.0.0.0>
> Jul 11 13:31:38 river pumpd[4009]: intf: netmask: 255.255.255.0 
> <http://255.255.255.0>
> Jul 11 13:31:38 river pumpd[4009]: intf: gateways[0]: 192.168.0.1 
> <http://192.168.0.1>
> Jul 11 13:31:38 river pumpd[4009]: intf: numGateways: 1
> Jul 11 13:31:38 river pumpd[4009]: intf: dnsServers[0]: 192.168.0.1 
> <http://192.168.0.1>
> Jul 11 13:31:38 river pumpd[4009]: intf: numDns: 1
> Jul 11 13:31:38 river pumpd[4009]: intf: broadcast: 192.168.0.255 
> <http://192.168.0.255>
> Jul 11 13:31:38 river pumpd[4009]: intf: network: 192.168.0.0 
> <http://192.168.0.0>
> Jul 11 13:31:38 river kernel: zd1211rw 1-1.1:1.0: 
> zd_mac_set_multicast_list() mc addr 01:00:5e:00:00:01
> Jul 11 13:31:38 river kernel: zd1211rw 1-1.1:1.0: 
> zd_chip_set_multicast_hash() hash l 0x00000001 h 0x80000000
> Jul 11 13:31:38 river kernel: zd1211rw 1-1.1:1.0: housekeeping_disable()

The above line indicates that something is bringing your interface down. 
This will cause association to be lost.

Given the timeframe, I'd suspect your DHCP client. I personally use 
dhcpcd v3, it never messes with interface state:
http://dhcpcd.berlios.de/

> Jul 11 13:31:38 river kernel: zd1211rw 1-1.1:1.0: 
> zd_chip_lock_phy_regs() CR_REG1: 0xa0 -> 0x20
> Jul 11 13:31:38 river kernel: zd1211rw 1-1.1:1.0: 
> zd_chip_unlock_phy_regs() CR_REG1: 0x20 -> 0xa0
> Jul 11 13:31:38 river kernel: zd1211rw 1-1.1:1.0: zd_usb_disable_int() 
> urb f61fc1c0 killed
> Jul 11 13:31:38 river kernel: zd1211rw 1-1.1:1.0: zd_usb_enable_int()
> Jul 11 13:31:38 river kernel: zd1211rw 1-1.1:1.0: zd_usb_enable_int() 
> submit urb f61fc1c0
> Jul 11 13:31:38 river kernel: zd1211rw 1-1.1:1.0: 
> zd_chip_set_basic_rates_locked() ff0f
> Jul 11 13:31:39 river kernel: zd1211rw 1-1.1:1.0: zd_usb_ioread16v() 
> read timed out
> Jul 11 13:31:39 river kernel: zd1211rw 1-1.1:1.0: zd_ioread32v_locked() 
> error: zd_ioread16v_locked. Error number -110
> Jul 11 13:31:39 river kernel: zd1211rw 1-1.1:1.0: error 
> ioread32(CR_REG1): -110
> Jul 11 13:31:39 river kernel: zd1211rw 1-1.1:1.0: zd_usb_disable_int() 
> urb f61fc1c0 killed
> Jul 11 13:31:39 river pumpd[4009]: configured interface wlan0
> Jul 11 13:31:39 river pumpd[4009]: failed to set default route: Network 
> is unreachable


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