Bug 45491

Summary: kernel panics after using the hotkey to disable then re-enable the wifi
Product: Drivers Reporter: Joseph Salisbury (joseph.salisbury)
Component: network-wirelessAssignee: drivers_network-wireless (drivers_network-wireless)
Status: RESOLVED DUPLICATE    
Severity: normal CC: johannes, linville, wey-yi.w.guy
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: emmanuel.grumbach@intel.com Subsystem:
Regression: Yes Bisected commit-id:

Description Joseph Salisbury 2012-08-03 16:20:10 UTC 
The kernel panics after using the hotkey to disable then re-enable the wifi card on a Dell XPS 14z.


A bug[0] was reported against Ubuntu that reports a kernel panic when using the hotkey to disable then re-enable wifi on a Dell XPS 14z.  A kernel bisect was performed, which indicated the following commit as the source of the regression:


commit dd551ab7b47ace14753b0d73f79437cc35adcf6b
Author: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Date:   Thu May 3 14:22:01 2012 -0700

    iwlwifi: include rssi as part of decision making for reduce txpower
   
    In bt coex, consider the average rssi as part of decision making process
   
    Change-Id: I8d11d7f177a6875e2a9d08f7539d42253226fd7a
    Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
    Reviewed-on: http://git-mwg.jer.intel.com/gerrit/1945
    Tested-by: Jenkins
    Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
    Signed-off-by: John W. Linville <linville@tuxdriver.com>

A test kernel was created with this commit reverted, which stopped the kernel panic from occurring.

[0] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1029547
Comment 1 Joseph Salisbury 2012-08-03 16:47:02 UTC 

*** This bug has been marked as a duplicate of bug 45481 ***