ide: add ide_set_dma() helper (v2)
* add ide_set_dma() helper and make ide_hwif_t.ide_dma_check return
-1 when DMA needs to be disabled (== need to call ->ide_dma_off_quietly)
0 when DMA needs to be enabled (== need to call ->ide_dma_on)
1 when DMA setting shouldn't be changed
* fix IDE code to use ide_set_dma() instead if using ->ide_dma_check directly
v2:
* updated for scc_pata
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index fbc6d39..5585c01a9 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -1135,7 +1135,8 @@
if (HWIF(drive)->ide_dma_check == NULL)
return -EPERM;
if (arg) {
- if (HWIF(drive)->ide_dma_check(drive)) return -EIO;
+ if (ide_set_dma(drive))
+ return -EIO;
if (HWIF(drive)->ide_dma_on(drive)) return -EIO;
} else {
if (__ide_dma_off(drive))