centos man page for spi_bus_unlock

SPI_BUS_UNLOCK(9)					  Serial Peripheral Interface (S					 SPI_BUS_UNLOCK(9)

NAME
       spi_bus_unlock - release the lock for exclusive SPI bus usage

SYNOPSIS
       int spi_bus_unlock(struct spi_master * master);

ARGUMENTS
       master
	   SPI bus master that was locked for exclusive bus access

CONTEXT
       can sleep

DESCRIPTION
       This call may only be used from a context that may sleep. The sleep is non-interruptible, and has no timeout.

       This call releases an SPI bus lock previously obtained by an spi_bus_lock call.

       It returns zero on success, else a negative error code.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							 SPI_BUS_UNLOCK(9)