Re: [REGRESSION 3.8-r1] broken pci irq/pm state for e1000e device
From: Konstantin Khlebnikov
Date: Sat Jan 05 2013 - 07:43:12 EST
Konstantin Khlebnikov wrote:
Konstantin Khlebnikov wrote:
Seems like it's unrelated to e1000e driver itself, because I tried to
revert all it's changes down to 3.6 one by one and it does not help.
Ouch, 3.6 also affected, seems like I was more lucky at that time and
bug never showed up.
root@zurg:/sys/bus/pci/devices# uname -a
Linux zurg 3.6.0-zurg #571 SMP Mon Oct 1 14:24:25 MSK 2012 x86_64 GNU/Linux
root@zurg:/sys/bus/pci/devices# cat 0000\:00\:19.0/enable ; modprobe e1000e ; sleep 2 ; rmmod e1000e ; cat 0000\:00\:19.0/enable
4294967293
4294967292
So, this bug actually in e1000e driver. Add their mail-list into CC.
But core code should at least print some warnings...
Looks like regression somewhere in pci-bus irq or power-management.
because I see underflow of counter pci_dev->enable_cnt:
root@zurg:/sys/bus/pci/devices# cat 0000\:00\:19.0/enable ; modprobe e1000e ; sleep 2 ; rmmod e1000e ; cat 0000\:00\:19.0/enable
4294967288
4294967287
without sleep in the middle it does not work
Hmm, 3.7 also affected. This is not good.
root@zurg:/sys/bus/pci/devices# cat 0000\:00\:19.0/enable
4294967293
root@zurg:/sys/bus/pci/devices# uname -a
Linux zurg 3.7.1-zurg #631 SMP Sat Dec 29 11:54:15 MSK 2012 x86_64 GNU/Linux
my kernel config in attachment
hardware: lenovo thinkpad x220
root@zurg:/sys/bus/pci/devices# uname -a
Linux zurg 3.8.0-rc1-zurg-00091-g4a490b7 #632 SMP Tue Jan 1 20:02:31 MSK 2013 x86_64 GNU/Linux
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