[ide] remove ide_hwif_t->sg_dma_active

It is always equal to zero.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>

drivers/ide/arm/icside.c

@@ -215,8 +215,6 @@ static void icside_build_sglist(ide_drive_t *drive, struct request *rq)
 	struct scatterlist *sg = hwif->sg_table;
 	int nents;
 
-	BUG_ON(hwif->sg_dma_active);
-
 	if (rq->flags & REQ_DRIVE_TASKFILE) {
 		ide_task_t *args = rq->special;
 
@@ -401,8 +399,6 @@ static int icside_dma_end(ide_drive_t *drive)
 	dma_unmap_sg(state->dev, hwif->sg_table, hwif->sg_nents,
 		     hwif->sg_dma_direction);
 
-	hwif->sg_dma_active = 0;
-
 	return get_dma_residue(hwif->hw.dma) != 0;
 }
 
@@ -454,7 +450,6 @@ icside_dma_common(ide_drive_t *drive, struct request *rq,
 	/*
 	 * We can not enable DMA on both channels.
 	 */
-	BUG_ON(hwif->sg_dma_active);
 	BUG_ON(dma_channel_active(hwif->hw.dma));
 
 	icside_build_sglist(drive, rq);

drivers/ide/ide-dma.c

@@ -208,9 +208,6 @@ int ide_build_sglist(ide_drive_t *drive, struct request *rq)
 	struct scatterlist *sg = hwif->sg_table;
 	int nents;
 
-	if (hwif->sg_dma_active)
-		BUG();
-
 	nents = blk_rq_map_sg(drive->queue, rq, hwif->sg_table);
 		
 	if (rq_data_dir(rq) == READ)
@@ -366,7 +363,6 @@ int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
 		     hwif->sg_table,
 		     hwif->sg_nents,
 		     hwif->sg_dma_direction);
-	hwif->sg_dma_active = 0;
 	return 0; /* revert to PIO for this request */
 }
 
@@ -390,7 +386,6 @@ void ide_destroy_dmatable (ide_drive_t *drive)
 	int nents = HWIF(drive)->sg_nents;
 
 	pci_unmap_sg(dev, sg, nents, HWIF(drive)->sg_dma_direction);
-	HWIF(drive)->sg_dma_active = 0;
 }
 
 EXPORT_SYMBOL_GPL(ide_destroy_dmatable);

drivers/ide/pci/sgiioc4.c

@@ -570,7 +570,6 @@ sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
 use_pio_instead:
 	pci_unmap_sg(hwif->pci_dev, hwif->sg_table, hwif->sg_nents,
 		     hwif->sg_dma_direction);
-	hwif->sg_dma_active = 0;
 
 	return 0;		/* revert to PIO for this request */
 }

drivers/ide/ppc/pmac.c

@@ -1578,9 +1578,6 @@ pmac_ide_build_sglist(ide_drive_t *drive, struct request *rq)
 	struct scatterlist *sg = pmif->sg_table;
 	int nents;
 
-	if (hwif->sg_dma_active)
-		BUG();
-		
 	nents = blk_rq_map_sg(drive->queue, rq, sg);
 		
 	if (rq_data_dir(rq) == READ)
@@ -1715,7 +1712,6 @@ pmac_ide_build_dmatable(ide_drive_t *drive, struct request *rq)
 		     pmif->sg_table,
 		     pmif->sg_nents,
 		     pmif->sg_dma_direction);
-	hwif->sg_dma_active = 0;
 	return 0; /* revert to PIO for this request */
 }
 
@@ -1731,7 +1727,6 @@ pmac_ide_destroy_dmatable (ide_drive_t *drive)
 	if (nents) {
 		pci_unmap_sg(dev, sg, nents, pmif->sg_dma_direction);
 		pmif->sg_nents = 0;
-		HWIF(drive)->sg_dma_active = 0;
 	}
 }
 

include/linux/ide.h

@@ -929,7 +929,6 @@ typedef struct hwif_s {
 	struct scatterlist *sg_table;
 	int sg_nents;			/* Current number of entries in it */
 	int sg_dma_direction;		/* dma transfer direction */
-	int sg_dma_active;		/* is it in use */
 
 	/* data phase of the active command (currently only valid for PIO/DMA) */
 	int		data_phase;