Change channel bandwidth without iw command

Michal Kazior michal.kazior at
Fri Oct 24 00:49:22 PDT 2014

On 23 October 2014 08:57, Okhwan Lee <ohlee at> wrote:
> Hi,
> Thank you for your answer.
>> The panic printout would be most helpful. My best guess is this
>> crashes in ath10k_dbg() at the very beginning of ath10k_config_chan
>> because ar->chandef.chan is NULL. This is probably the case since you
>> use monitor_chandef which is probably "empty" at the point you invoke
>> your code.
> First, we confirm that ar->chandef.chan is not NULL.
> We find out the the error occurs when "wait_for_completion_timeout" is called.
> Ath10k is trying to stop vdev (monitor_dev) when change the channel setting.
> We have no idea about the details of function, but it make waiting
> time duration for previous event.
> We also test by replacing wait_for_completion_timeout to
> wait_for_completion (i.e., it use maximum timeout value)
> But the kernel panic is still there.
> However, it is not easy to printout the messages when the panic is occurred,
> because the system stop (similar to bluescreen in widnows?).
> After reboot the system, the log messagess from panic is not recored
> in kernel log messages (/var/log/syslog, dmesg, kernel_llog) .

Can you at least do a photo of the panic, post it to an image hosting
site and link it, please?


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