pata_ali: fix checking of DMA state

Checking if DMA is enabled should be done via the
ata_dma_enabled helper function, since the init state
0xff indicates disabled.
Change based on code review, not tested due to lack of hardware.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

drivers/ata/pata_ali.c

@@ -215,7 +215,7 @@ static void ali_set_piomode(struct ata_port *ap, struct ata_device *adev)
 		struct ata_timing p;
 		ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
 		ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
-		if (pair->dma_mode) {
+		if (ata_dma_enabled(pair)) {
 			ata_timing_compute(pair, pair->dma_mode, &p, T, 1);
 			ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
 		}
@@ -264,7 +264,7 @@ static void ali_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 			struct ata_timing p;
 			ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
 			ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
-			if (pair->dma_mode) {
+			if (ata_dma_enabled(pair)) {
 				ata_timing_compute(pair, pair->dma_mode, &p, T, 1);
 				ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
 			}