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[PATCH] libata-dev: ata_check_atapi_dma() fix for ATA_FLAG_PIO_POLLING LLDDs

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ata_check_atapi_dma() fix for LLDDs with the ATA_FLAG_PIO_POLLING flag.

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Albert Lee 2006-03-25 17:56:55 +08:00 committed by Jeff Garzik
parent 27cdadef6d
commit c2bbc55161
1 changed files with 10 additions and 0 deletions
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10
drivers/scsi/libata-core.c
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@ -2883,6 +2883,15 @@ int ata_check_atapi_dma(struct ata_queued_cmd *qc)
if (ap->ops->check_atapi_dma)
rc = ap->ops->check_atapi_dma(qc);
/* We don't support polling DMA.
* Use PIO if the LLDD handles only interrupts in
* the HSM_ST_LAST state and the ATAPI device
* generates CDB interrupts.
*/
if ((ap->flags & ATA_FLAG_PIO_POLLING) &&
(qc->dev->flags & ATA_DFLAG_CDB_INTR))
rc = 1;
return rc;
}
/**
@ -4038,6 +4047,7 @@ unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
break;
case ATA_PROT_ATAPI_DMA:
if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
/* see ata_check_atapi_dma() */
BUG();
break;
default: