SPI_SYNC_LOCKED(9)                Serial Peripheral Interface (S               SPI_SYNC_LOCKED(9)



NAME
       spi_sync_locked - version of spi_sync with exclusive bus usage

SYNOPSIS
       int spi_sync_locked(struct spi_device * spi, struct spi_message * message);

ARGUMENTS
       spi
           device with which data will be exchanged

       message
           describes the data transfers

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. Low-overhead controller drivers may DMA directly into and out of the
       message buffers.

       This call should be used by drivers that require exclusive access to the SPI bus. It has
       to be preceded by a spi_bus_lock call. The SPI bus must be released by a spi_bus_unlock
       call when the exclusive access is over.

RETURN
       zero on success, else a negative error code.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                        SPI_SYNC_LOCKED(9)