'\" t
.\"     Title: ata_std_qc_defer
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: libata Library
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "ATA_STD_QC_DEFER" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "libata Library"
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.SH "NAME"
ata_std_qc_defer \- Check whether a qc needs to be deferred
.SH "SYNOPSIS"
.HP \w'int\ ata_std_qc_defer('u
.BI "int ata_std_qc_defer(struct\ ata_queued_cmd\ *\ " "qc" ");"
.SH "ARGUMENTS"
.PP
\fIqc\fR
.RS 4
ATA command in question
.RE
.SH "DESCRIPTION"
.PP
Non\-NCQ commands cannot run with any other command, NCQ or not\&. As upper layer only knows the queue depth, we are responsible for maintaining exclusion\&. This function checks whether a new command
\fIqc\fR
can be issued\&.
.PP
LOCKING: spin_lock_irqsave(host lock)
.SH "RETURN"
.PP
ATA_DEFER_* if deferring is needed, 0 otherwise\&.
.SH "AUTHOR"
.PP
\fBJeff Garzik\fR
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br