[PATCH] libata: let ATA_FLAG_PIO_POLLING use polling pio for ATA_PROT_NODATA

Even if ATA_FLAG_PIO_POLLING is set, libata uses irq pio for the ATA_PROT_NODATA protocol.
This patch let ATA_FLAG_PIO_POLLING use polling pio for the ATA_PROT_NODATA protocol.
Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/libata-core.c

@@ -4960,6 +4960,7 @@ unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
 	if (ap->flags & ATA_FLAG_PIO_POLLING) {
 		switch (qc->tf.protocol) {
 		case ATA_PROT_PIO:
+		case ATA_PROT_NODATA:
 		case ATA_PROT_ATAPI:
 		case ATA_PROT_ATAPI_NODATA:
 			qc->tf.flags |= ATA_TFLAG_POLLING;