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Bug 234900

Summary: b2c2-flexcop-pci causes lockdep lock
Product: [Fedora] Fedora Reporter: Hendrik Borghorst <hendrikborghorst>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED UPSTREAM QA Contact: Brian Brock <bbrock>
Severity: urgent Docs Contact:
Priority: medium    
Version: rawhideCC: jarod, mkrufky
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2007-05-18 13:14:58 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Attachments:
Description Flags
Patch to fix the problem none

Description Hendrik Borghorst 2007-04-02 19:32:27 UTC
Description of problem:
I've installed FC7T3 and it tries to boot but when it tries loading udev it
locks up with the message: "the code is fine but needs lockdep annotation.
> [13440.772455] turning off the locking correctness validator." and some debug
printout. If I blacklist the b2c2-flexcop-pci module than FC7 boots right.


Version-Release number of selected component (if applicable):
Fedora 7 Rawhide


How reproducible:
100% every reboot

Steps to Reproduce:
1.modprobe b2c2-flexcop-pci
2.see the lock
3.
  
Actual results:
System freeze

Expected results:
working dvb :-)


Additional info:
I've an Technisat Airstar 2 DVB-T Card.

Comment 1 Hendrik Borghorst 2007-04-04 13:12:55 UTC
Created attachment 151655 [details]
Patch to fix the problem

In the flexcop-pci.c spin_lock is used before it was initialized by
spin_lock_init. Hope to include this.

Comment 2 Jarod Wilson 2007-04-04 13:52:19 UTC
Has this been sent upstream at all yet? I don't see it in the main v4l-dvb tree,
but that doesn't mean someone already knows about it...

If not, Michael, can I talk you into taking a look at it? :)

I've got a box with a b2c2-flexcop-pci card I can throw a rawhide kernel at
pretty easily to see if I can reproduce and validate the fix, if it helps.

Comment 3 Michael Krufky 2007-04-05 16:49:10 UTC
Patrick maintains this driver...  There is discussion in the following thread:

http://linuxtv.org/pipermail/linux-dvb/2007-April/016985.html

Comment 4 Michael Krufky 2007-04-05 19:56:59 UTC
Mauro pushed the patch into v4l-dvb.hg master repository today:

http://linuxtv.org/hg/v4l-dvb?cmd=changeset;node=a80058519add

Comment 5 Jarod Wilson 2007-05-18 13:14:58 UTC
Works fine with the latest kernels in my own b2c2-flexcop-pci box.