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Bug 234900 - b2c2-flexcop-pci causes lockdep lock
b2c2-flexcop-pci causes lockdep lock
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
i386 Linux
medium Severity urgent
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Assigned To: Kernel Maintainer List
Brian Brock
Depends On:
  Show dependency treegraph
Reported: 2007-04-02 15:32 EDT by Hendrik Borghorst
Modified: 2007-11-30 17:12 EST (History)
2 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2007-05-18 09:14:58 EDT
Type: ---
Regression: ---
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Patch to fix the problem (1.01 KB, patch)
2007-04-04 09:12 EDT, Hendrik Borghorst
no flags Details | Diff

  None (edit)
Description Hendrik Borghorst 2007-04-02 15:32:27 EDT
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
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 09:12:55 EDT
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 09:52:19 EDT
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 12:49:10 EDT
Patrick maintains this driver...  There is discussion in the following thread:

Comment 4 Michael Krufky 2007-04-05 15:56:59 EDT
Mauro pushed the patch into v4l-dvb.hg master repository today:

Comment 5 Jarod Wilson 2007-05-18 09:14:58 EDT
Works fine with the latest kernels in my own b2c2-flexcop-pci box.

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