1SPI_BUS_LOCK(9)         Serial Peripheral Interface (S         SPI_BUS_LOCK(9)
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NAME

6       spi_bus_lock - obtain a lock for exclusive SPI bus usage
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SYNOPSIS

9       int spi_bus_lock(struct spi_master * master);
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ARGUMENTS

12       master
13           SPI bus master that should be locked for exclusive bus access
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CONTEXT

16       can sleep
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DESCRIPTION

19       This call may only be used from a context that may sleep. The sleep is
20       non-interruptible, and has no timeout.
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22       This call should be used by drivers that require exclusive access to
23       the SPI bus. The SPI bus must be released by a spi_bus_unlock call when
24       the exclusive access is over. Data transfer must be done by
25       spi_sync_locked and spi_async_locked calls when the SPI bus lock is
26       held.
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28       It returns zero on success, else a negative error code.
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31Kernel Hackers Manual 3.10         June 2019                   SPI_BUS_LOCK(9)
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