'\" t
.\"     Title: scsi_test_unit_ready
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: SCSI mid layer
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "SCSI_TEST_UNIT_READY" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "SCSI mid layer"
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.SH "NAME"
scsi_test_unit_ready \- test if unit is ready
.SH "SYNOPSIS"
.HP \w'int\ scsi_test_unit_ready('u
.BI "int scsi_test_unit_ready(struct\ scsi_device\ *\ " "sdev" ", int\ " "timeout" ", int\ " "retries" ", struct\ scsi_sense_hdr\ *\ " "sshdr_external" ");"
.SH "ARGUMENTS"
.PP
\fIsdev\fR
.RS 4
scsi device to change the state of\&.
.RE
.PP
\fItimeout\fR
.RS 4
command timeout
.RE
.PP
\fIretries\fR
.RS 4
number of retries before failing
.RE
.PP
\fIsshdr_external\fR
.RS 4
Optional pointer to struct scsi_sense_hdr for returning sense\&. Make sure that this is cleared before passing in\&.
.RE
.SH "DESCRIPTION"
.PP
Returns zero if unsuccessful or an error if TUR failed\&. For removable media, UNIT_ATTENTION sets \->changed flag\&.
.SH "AUTHORS"
.PP
\fBJames Bottomley\fR <\&James.Bottomley@hansenpartnership.com\&>
.RS 4
Author.
.RE
.PP
\fBRob Landley\fR <\&rob@landley.net\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br