atapi_check_dma
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## Name

atapi_check_dma — Check whether ATAPI DMA can be supported

## Synopsis

`int atapi_check_dma (` | struct ata_queued_cmd * qc`)`;

## Arguments

`qc`

  Metadata associated with taskfile to check

## Description

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.

## LOCKING

spin_lock_irqsave(host lock)

## RETURNS

0 when ATAPI DMA can be used nonzero otherwise

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