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cycle_kernel_lock() was added during the big BKL pushdown. It should
ensure the serializiation against driver init code.
mmapper_open() cannot be called before misc_register() succeeded, but
p_buf might be uninitialized.
Move the initialization of p_buf before the misc_register() call and
get rid of cycle_kernel_lock().
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <20091010153349.682213670@linutronix.de>
Cc: Jeff Dike <jdike@addtoit.com>
d63c489b88