Commit c2bbc551 authored by Albert Lee's avatar Albert Lee Committed by Jeff Garzik
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[PATCH] libata-dev: ata_check_atapi_dma() fix for ATA_FLAG_PIO_POLLING LLDDs 



ata_check_atapi_dma() fix for LLDDs with the ATA_FLAG_PIO_POLLING flag.

Signed-off-by: default avatarAlbert Lee <albertcc@tw.ibm.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 27cdadef

drivers/scsi/libata-core.c

+10 −0
Original line number Diff line number Diff line
@@ -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: