'\" t
.\"     Title: mptctl_syscall_down
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Message-based devices
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "MPTCTL_SYSCALL_DOWN" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Message-based devices"
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.SH "NAME"
mptctl_syscall_down \- Down the MPT adapter syscall semaphore\&.
.SH "SYNOPSIS"
.HP \w'int\ mptctl_syscall_down('u
.BI "int mptctl_syscall_down(MPT_ADAPTER\ *\ " "ioc" ", int\ " "nonblock" ");"
.SH "ARGUMENTS"
.PP
\fIioc\fR
.RS 4
Pointer to MPT adapter
.RE
.PP
\fInonblock\fR
.RS 4
boolean, non\-zero if O_NONBLOCK is set
.RE
.SH "DESCRIPTION"
.PP
All of the ioctl commands can potentially sleep, which is illegal with a spinlock held, thus we perform mutual exclusion here\&.
.PP
Returns negative errno on error, or zero for success\&.
.SH "COPYRIGHT"
.br