Release the lock for exclusive spi bus usage
int spi_bus_unlock(struct spi_master * master);
master
SPI bus master that was locked for exclusive bus access
can sleep
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.