[REGRESSION][3.8.-rc1][ INFO: possible circular locking dependency detected ]

On Thu, Dec 27, 2012 at 08:03:24AM -0500, Peter Hurley wrote:

On Thu, 2012-12-27 at 16:36 +0800, Shawn Guo wrote:

quoted

On Wed, Dec 26, 2012 at 10:34:39AM +0800, Shawn Guo wrote:

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It seems that I'm running into the same locking issue.  My setup is:

- i.MX28 (ARM)
- v3.8-rc1
- mxs_defconfig

  - The warning is seen when LCD is blanking

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The warning disappears after reverting patch daee779 (console: implement
lockdep support for console_lock).  Is it suggesting that the mxs
frame buffer driver (drivers/video/mxsfb.c) is doing something bad?

Shawn

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[  602.229899] ======================================================
[  602.229905] [ INFO: possible circular locking dependency detected ]
[  602.229926] 3.8.0-rc1-00003-gde4ae7f #767 Not tainted
[  602.229933] -------------------------------------------------------
[  602.229951] kworker/0:1/21 is trying to acquire lock:
[  602.230037]  ((fb_notifier_list).rwsem){.+.+.+}, at: [<c0041f34>] __blocking_notifier_call_chain+0x2c/0x60

You want this patch https://patchwork.kernel.org/patch/1757061/

Thanks for the pointer, Peter.  It does fix the problem for me.

Shawn