linux-kernel - Re: CPU load after killing iwlagn with RF kill switch

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Message-ID: <20080817035921.4d35ae0e@mtlp.12thdimension>
Date:	Sun, 17 Aug 2008 03:59:21 +0200
From:	Mirco Tischler <mt-ml@....de>
To:	Leonid Podolny <leonidp.lists@...il.com>
Cc:	linux-kernel@...r.kernel.org, yi.zhu@...el.com,
	reinette.chatre@...el.com, linux-wireless@...r.kernel.org,
	IvDoorn@...il.com
Subject: Re: CPU load after killing iwlagn with RF kill switch

On Fri, 15 Aug 2008 23:50:10 +0300, Leonid Podolny wrote:
> Hi,
> With a new iwlagn driver and 2.6.27-rc3, if I turn off the wireless 
> (intel 4965ag) by RF kill switch, the CPU utilization of ksoftirqd 
> process raises to 100% and stays there until I rmmod the module.
> Please let me know what further information I can provide.

Hi

Same on my machine with same chip and same kernel.
If I use the switch on the side of my laptop to turn off wlan, ksoftirqd eats
up one core of my cpu til I switch it on again or rmmod the iwlagn module. But
when I switch it on before the device loses connection and then off a second
time, I now get a (the) second ksoftirqd process eating up the other core too.
This only happens if a connection is established, though.
I'm not sure if this problem existed in 2.6.26 but I doubt it. (Will check if I
find the time).

My dmesg shows me this:

[48067.257539] iwlagn: Radio Frequency Kill Switch is On:
[48067.257539] Kill switch must be turned off for wireless networking to work.
[48071.295154] wlan0: No ProbeResp from current AP 00:c0:a8:e5:e5:a5 - assume
out of range 
[48072.099173] iwlagn: Error sending REPLY_ADD_STA: enqueue_hcmd failed: -5 
[48072.099260] mac80211-phy1: failed to remove key (0, 00:c0:a8:e5:e5:a5) from
hardware (-5) 
[48072.206028] iwlagn: Error sending REPLY_ADD_STA: enqueue_hcmd failed: -5 
[48072.206028] mac80211-phy1: failed to remove key (1, ff:ff:ff:ff:ff:ff) from
hardware (-5)

The probably interesting parts of my config look like that:

CONFIG_IWLWIFI=m
CONFIG_IWLCORE=m
CONFIG_IWLWIFI_LEDS=y
CONFIG_IWLWIFI_RFKILL=y
# CONFIG_IWLWIFI_DEBUG is not set
CONFIG_IWLAGN=m
CONFIG_IWLAGN_SPECTRUM_MEASUREMENT=y
CONFIG_IWLAGN_LEDS=y
CONFIG_IWL4965=y
# CONFIG_IWL5000 is not set
# CONFIG_IWL3945 is not set

CONFIG_RFKILL=m
# CONFIG_RFKILL_INPUT is not set
CONFIG_RFKILL_LEDS=y
CONFIG_IWLWIFI_RFKILL=y

I can recompile with debug options set if this helps. Just haven't found the
time.

Thanks
Mirco

P.S.: added some cc's for iwlwifi and rfkill.

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