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SubjectRE: WARNING: at lib/iomap.c:43 0xffffffffa00ac458()
Fix is on the way:

commit 4eb60d869fdad7acd098b53bfd1863c311d8933d
Author: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date: Sat Aug 13 09:02:43 2011 -0700

Revert "iwlagn: sysfs couldn't find the priv pointer"

This reverts commit cc1a93e68f6c0d736b771f0746e8e4186f483fdc.

This fix introduced a bug: bad pointer in unload.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

And

commit 16a9d06c753abc44f66f88e03bbecb3f1e45d71b
Author: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date: Sat Aug 13 09:02:44 2011 -0700

iwlagn: sysfs couldn't find the priv pointer

This bug has been introduced by:
d593411084a56124aa9d80aafa15db8463b2d8f7
Author: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date: Mon Jul 11 10:48:51 2011 +0300

iwlagn: simplify the bus architecture

Revert part of the buggy patch: dev_get_drvdata will now return
iwl_priv as it did before the patch.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>


You can cherry-pick these and give it a try
I removed Linus from this thread, since I am pretty sure he doesn't need to be on that one, and I guess he receives many mails... I may be wrong though...

>
> I bisected it further and it came down to this commit. Reverting it
> solves
> the problem. Now I'm on linux-3.1.0-rc2
> (bed8cad9593974a46de5c8aa3d2ee7c49c17182f) with the patch reverted and
> system
> is stable once again. modprobe -r iwlagn no longer hangs the system.
>
> commit cc1a93e68f6c0d736b771f0746e8e4186f483fdc
> Author: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
> Date: Mon Aug 1 12:46:57 2011 -0700
>
> iwlagn: sysfs couldn't find the priv pointer
>
> This bug has been introduced by:
> d593411084a56124aa9d80aafa15db8463b2d8f7
> Author: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
> Date: Mon Jul 11 10:48:51 2011 +0300
>
> iwlagn: simplify the bus architecture
>
> Revert part of the buggy patch: dev_get_drvdata will now return
> iwl_priv as it did before the patch.
>
> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
> Tested-by: Daniel Halperin <dhalperi@cs.washington.edu>
> Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
> Signed-off-by: John W. Linville <linville@tuxdriver.com>
>
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