'\" t
.\"     Title: atapi_check_dma
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: June 2017
.\"    Manual: libata Core Internals
.\"    Source: Kernel Hackers Manual 4.11.3
.\"  Language: English
.\"
.TH "ATAPI_CHECK_DMA" "9" "June 2017" "Kernel Hackers Manual 4\&.11\&" "libata Core Internals"
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.SH "NAME"
atapi_check_dma \- Check whether ATAPI DMA can be supported
.SH "SYNOPSIS"
.HP \w'int\ atapi_check_dma('u
.BI "int atapi_check_dma(struct\ ata_queued_cmd\ *\ " "qc" ");"
.SH "ARGUMENTS"
.PP
\fIstruct ata_queued_cmd * qc\fR
.RS 4
Metadata associated with taskfile to check
.RE
.SH "DESCRIPTION"
.PP
Allow low\-level driver to filter ATA PACKET commands, returning a status indicating whether or not it is OK to use DMA for the supplied PACKET command\&.
.PP
LOCKING: spin_lock_irqsave(host lock)
.SH "RETURN"
.PP
0 when ATAPI DMA can be used nonzero otherwise
.SH "AUTHOR"
.PP
\fBJeff Garzik\fR
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br