This is the commit reported by bisect:

2b4208383d114d202d38eb3b04ff7b844de8eefa is the first bad commit
commit 2b4208383d114d202d38eb3b04ff7b844de8eefa
Author: Johannes Berg <johannes.b...@intel.com>
Date:   Fri May 6 11:11:20 2011 -0700

    iwlagn: fix iwl_is_any_associated
    
    BugLink: http://bugs.launchpad.net/bugs/793702
    
    commit 054ec924944912413e4ee927b8cf02f476d08783 upstream.
    
    The function iwl_is_any_associated() was intended
    to check both contexts, but due to an oversight
    it only checks the BSS context. This leads to a
    problem with scanning since the passive dwell
    time isn't restricted appropriately and a scan
    that includes passive channels will never finish
    if only the PAN context is associated since the
    default dwell time of 120ms won't fit into the
    normal 100 TU DTIM interval.
    
    Fix the function by using for_each_context() and
    also reorganise the other functions a bit to take
    advantage of each other making the code easier to
    read.
    
    Signed-off-by: Johannes Berg <johannes.b...@intel.com>
    Signed-off-by: Wey-Yi Guy <wey-yi.w....@intel.com>
    Signed-off-by: John W. Linville <linvi...@tuxdriver.com>
    Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
    Signed-off-by: Tim Gardner <tim.gard...@canonical.com>

:040000 040000 0db112ac8e49c4741150666f49236a5386ecbeb3
7d2640cda3ac0b9b69fae1bdf35ee62e3be310cc M      drivers

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https://bugs.launchpad.net/bugs/837819

Title:
  Latest kernel 2.6.38-11.48 crashes the iwlagn (wifi) driver

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