ide: add ide_dma_prepare() helper
* Add ide_dma_prepare() helper.
* Convert ide_issue_pc() and do_rw_taskfile() to use it.
* Make ide_build_sglist() static.
There should be no functional changes caused by this patch.
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index b430898..cf5897f 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -128,7 +128,7 @@
* operate in a portable fashion.
*/
-int ide_build_sglist(ide_drive_t *drive, struct ide_cmd *cmd)
+static int ide_build_sglist(ide_drive_t *drive, struct ide_cmd *cmd)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
@@ -563,3 +563,12 @@
return 0;
}
EXPORT_SYMBOL_GPL(ide_allocate_dma_engine);
+
+int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd)
+{
+ if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 ||
+ ide_build_sglist(drive, cmd) == 0 ||
+ drive->hwif->dma_ops->dma_setup(drive, cmd))
+ return 1;
+ return 0;
+}