wearefam@fambox:~/src/linux-kernel/linux-next$ git bisect good
585d98e00ba7a5e2abe65f7a1eff631cb612289b is the first bad commit
commit 585d98e00ba7a5e2abe65f7a1eff631cb612289b
Author: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date:   Fri Jun 21 15:01:05 2013 +0200

    char: misc: assign file->private_data in all cases
    
    In fa1f68db6ca ("drivers: misc: pass miscdevice pointer via file
    private data"), the misc driver infrastructure was changed to assigned
    file->private_data as a pointer to the 'struct miscdevice' that
    corresponds to the device being opened.
    
    However, this assignment was only done when the misc driver was
    declaring a driver-specific ->open() operation in its
    file_operations. This doesn't make sense, as the driver may not
    necessarily have a custom ->open() operation, and might still be
    interested in having file->private_data properly set for use in its
    ->read() and write() operations.
    
    Therefore, we move the assignment of file->private_data outside of the
    condition that tests whether a driver-specific ->open() operation was
    defined.
    
    Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
    Acked-by: Arnd Bergmann <arnd@arndb.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

:040000 040000 9e6f8608cbf47a345beb5fbba1f6341df3634269 7d1bbea06d1c0dc77e4bdf31368131776462c575 M      drivers
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-dileks // 26-Jun-2013