'\" t
.\"     Title: spi_sync_locked
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Serial Peripheral Interface (SPI)
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "SPI_SYNC_LOCKED" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Serial Peripheral Interface (S"
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.SH "NAME"
spi_sync_locked \- version of spi_sync with exclusive bus usage
.SH "SYNOPSIS"
.HP \w'int\ spi_sync_locked('u
.BI "int spi_sync_locked(struct\ spi_device\ *\ " "spi" ", struct\ spi_message\ *\ " "message" ");"
.SH "ARGUMENTS"
.PP
\fIspi\fR
.RS 4
device with which data will be exchanged
.RE
.PP
\fImessage\fR
.RS 4
describes the data transfers
.RE
.SH "CONTEXT"
.PP
can sleep
.SH "DESCRIPTION"
.PP
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\&.
.PP
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\&.
.SH "RETURN"
.PP
zero on success, else a negative error code\&.
.SH "COPYRIGHT"
.br