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The control messages are usually small, around 8 bytes, and can be allocated on the stack. Using on stack allocation allows us to drop 'wr_msg' a rather large buffer reserved in the mei_dev structure and relax contention of this device global buffer. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>