1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 72ebab0bc75..059c90bb5ad 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -128,6 +128,7 @@ int ide_build_sglist(ide_drive_t *drive, struct request *rq)
 {
         ide_hwif_t *hwif = drive->hwif;
         struct scatterlist *sg = hwif->sg_table;
+        int i;
 
         ide_map_sg(drive, rq);
 
@@ -136,8 +137,13 @@ int ide_build_sglist(ide_drive_t *drive, struct request *rq)
         else
                 hwif->sg_dma_direction = DMA_TO_DEVICE;
 
-        return dma_map_sg(hwif->dev, sg, hwif->sg_nents,
-                          hwif->sg_dma_direction);
+        i = dma_map_sg(hwif->dev, sg, hwif->sg_nents, hwif->sg_dma_direction);
+        if (i) {
+                hwif->orig_sg_nents = hwif->sg_nents;
+                hwif->sg_nents = i;
+        }
+
+        return i;
 }
 EXPORT_SYMBOL_GPL(ide_build_sglist);
 
@@ -156,7 +162,7 @@ void ide_destroy_dmatable(ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
 
-        dma_unmap_sg(hwif->dev, hwif->sg_table, hwif->sg_nents,
+        dma_unmap_sg(hwif->dev, hwif->sg_table, hwif->orig_sg_nents,
                      hwif->sg_dma_direction);
 }
 EXPORT_SYMBOL_GPL(ide_destroy_dmatable);