linux-kernel - RE: WARNING: at lib/iomap.c:43 0xffffffffa00ac458()

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Date:	Sun, 21 Aug 2011 08:52:27 +0300
From:	"Grumbach, Emmanuel" <emmanuel.grumbach@...el.com>
To:	Jeff Chua <jeff.chua.linux@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
CC:	Daniel Halperin <dhalperi@...washington.edu>,
	"Guy, Wey-Yi W" <wey-yi.w.guy@...el.com>,
	"John W. Linville" <linville@...driver.com>
Subject: RE: WARNING: at lib/iomap.c:43 0xffffffffa00ac458()

Fix is on the way:

commit 4eb60d869fdad7acd098b53bfd1863c311d8933d
Author: Emmanuel Grumbach <emmanuel.grumbach@...el.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@...el.com>
    Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@...el.com>
    Signed-off-by: John W. Linville <linville@...driver.com>

And 

commit 16a9d06c753abc44f66f88e03bbecb3f1e45d71b
Author: Emmanuel Grumbach <emmanuel.grumbach@...el.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@...el.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@...el.com>
    Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@...el.com>
    Signed-off-by: John W. Linville <linville@...driver.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@...el.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@...el.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@...el.com>
>      Tested-by: Daniel Halperin <dhalperi@...washington.edu>
>      Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@...el.com>
>      Signed-off-by: John W. Linville <linville@...driver.com>
> 
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