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When the same portal is used to call mc_send_command() from two different threads or a thread and an interrupt handler, serialization is required, as the MC only supports one outstanding command per MC portal. Thus, a new command should not be sent to the MC until the last command sent has been responded by the MC. Signed-off-by: J. German Rivera <German.Rivera@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>