spi_bus_lock man page on OpenSuSE

spi_bus_lock man page on OpenSuSE

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SPI_BUS_LOCK(9)		Serial Peripheral Interface (S	       SPI_BUS_LOCK(9)

NAME
       spi_bus_lock - obtain a lock for exclusive SPI bus usage

SYNOPSIS
       int spi_bus_lock(struct spi_master * master);

ARGUMENTS
       master
	   SPI bus master that should be 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 should be used by drivers that require exclusive access to
       the SPI bus. The SPI bus must be released by a spi_bus_unlock call when
       the exclusive access is over. Data transfer must be done by
       spi_sync_locked and spi_async_locked calls when the SPI bus lock is
       held.

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

COPYRIGHT
Kernel Hackers Manual 3.11	 November 2013		       SPI_BUS_LOCK(9)

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