'\" t
.\"     Title: scsi_internal_device_block
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: June 2017
.\"    Manual: SCSI mid layer
.\"    Source: Kernel Hackers Manual 4.11.3
.\"  Language: English
.\"
.TH "SCSI_INTERNAL_DEVICE" "9" "June 2017" "Kernel Hackers Manual 4\&.11\&" "SCSI mid layer"
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.SH "NAME"
scsi_internal_device_block \- internal function to put a device temporarily into the SDEV_BLOCK state
.SH "SYNOPSIS"
.HP \w'int\ scsi_internal_device_block('u
.BI "int scsi_internal_device_block(struct\ scsi_device\ *\ " "sdev" ", bool\ " "wait" ");"
.SH "ARGUMENTS"
.PP
\fIstruct scsi_device * sdev\fR
.RS 4
device to block
.RE
.PP
\fIbool wait\fR
.RS 4
Whether or not to wait until ongoing \&.\fBqueuecommand\fR
/ \&.\fBqueue_rq\fR
calls have finished\&.
.RE
.SH "DESCRIPTION"
.PP
Block request made by scsi lld\*(Aqs to temporarily stop all scsi commands on the specified device\&. May sleep\&.
.PP
Returns zero if successful or error if not
.SH "NOTES"
.PP
This routine transitions the device to the SDEV_BLOCK state (which must be a legal transition)\&. When the device is in this state, all commands are deferred until the scsi lld reenables the device with scsi_device_unblock or device_block_tmo fires\&.
.PP
To do: avoid that
\fBscsi_send_eh_cmnd\fR
calls
\fBqueuecommand\fR
after
\fBscsi_internal_device_block\fR
has blocked a SCSI device and also remove the rport mutex lock and unlock calls from
\fBsrp_queuecommand\fR\&.
.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