commit 66c1ca breaks fbdev mode switching

[Krzysztof Helt]

Hi,

The commit 66c1ca breaks fbdev mode switching. The first mode
(selected with mode_option or during boot) is ok but every mode
switch with fbset locks up computer. If the commit is reverted
mode switching works correctly.

I do not understand why. I would be grateful if someone else
can confirm the problem as well.

The commit's details are:

commit 66c1ca019078220dc1bf968f2bb18421100ef147
Author: Andrea Righi <righi.andrea@xxxxxxxxx>
Date:   Tue Mar 31 15:25:18 2009 -0700

    fbmem: fix fb_info->lock and mm->mmap_sem circular locking dependency
    

Regards,
Krzysztof

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