Openmoko Bug #2327: wifi sometimes fails to start with "ar6000_activate: Failed to activate -4" when DEBUG_KERNEL/PREEMPT are disabled

[Openmoko Public Trac]

#2327: wifi sometimes fails to start with "ar6000_activate: Failed to activate -4"
when DEBUG_KERNEL/PREEMPT are disabled
-----------------------------+----------------------------------------------
 Reporter:  lindi            |          Owner:  openmoko-kernel
     Type:  defect           |         Status:  new            
 Priority:  normal           |      Milestone:                 
Component:  System Software  |        Version:                 
 Severity:  normal           |       Keywords:                 
 Haspatch:  0                |      Blockedby:                 
Estimated:                   |    Patchreview:                 
 Blocking:                   |   Reproducible:  sometimes      
-----------------------------+----------------------------------------------

Comment(by lindi):

 I tested delay_patch.diff. After a while I got again to the buggy state
 where wifi is powered on but no interface exists. This time the log does
 not show error messages from kernel but only has dhcp client complaining
 (I did verify later that "ip link" indeed does not show the interface):

 {{{
 kernel: [ 2137.870000] s3c2440-sdi s3c2440-sdi: host detect has no irq
 available
 kernel: [ 2137.875000] mapped channel 0 to 0
 kernel: [ 2137.875000] s3c2440-sdi s3c2440-sdi: powered down.
 kernel: [ 2137.880000] s3c2440-sdi s3c2440-sdi: initialisation done.
 kernel: [ 2137.895000] s3c2440-sdi s3c2440-sdi: running at 0kHz
 (requested: 0kHz).
 kernel: [ 2137.895000] s3c2440-sdi s3c2440-sdi: running at 196kHz
 (requested: 195kHz).
 kernel: [ 2137.905000] s3c2440-sdi s3c2440-sdi: running at 196kHz
 (requested: 195kHz).
 kernel: [ 2137.915000] s3c2440-sdi s3c2440-sdi: running at 196kHz
 (requested: 195kHz).
 kernel: [ 2137.920000] s3c2440-sdi s3c2440-sdi: running at 196kHz
 (requested: 195kHz).
 kernel: [ 2137.945000] s3c2440-sdi s3c2440-sdi: running at 196kHz
 (requested: 195kHz).
 kernel: [ 2137.955000] mmc1: queuing CIS tuple 0x01 length 3
 kernel: [ 2137.975000] mmc1: queuing CIS tuple 0x1a length 5
 kernel: [ 2137.985000] mmc1: queuing CIS tuple 0x1b length 8
 kernel: [ 2137.985000] s3c2440-sdi s3c2440-sdi: running at 25000kHz
 (requested: 25000kHz).
 kernel: [ 2137.990000] s3c2440-sdi s3c2440-sdi: running at 25000kHz
 (requested: 25000kHz).
 kernel: [ 2138.005000] mmc1: queuing CIS tuple 0x80 length 1
 kernel: [ 2138.005000] mmc1: queuing CIS tuple 0x81 length 1
 kernel: [ 2138.010000] mmc1: queuing CIS tuple 0x82 length 1
 kernel: [ 2138.015000] mmc1: new SDIO card at address 0001
 dhclient: Internet Systems Consortium DHCP Client V3.1.3
 dhclient: Copyright 2004-2009 Internet Systems Consortium.
 dhclient: All rights reserved.
 dhclient: For info, please visit https://www.isc.org/software/dhcp/
 dhclient:
 dhclient: Bind socket to interface: No such device
 }}}

 Also I am using andy-tracking a3587e4ed77974ad this time since I'm
 wondering if newer andy-tracking version introduced a TS bug or not.

-- 
Ticket URL: <https://docs.openmoko.org/trac/ticket/2327#comment:2>
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