ide: cleanup ide_set_dma()
* ->dma_off_quietly is always called before ide_set_dma()
so the call can be moved inside ide_set_dma().
* ide_dma_check() doesn't touch hardware so ->dma_off_quietly
call for 'rc == -1' case is redundant, remove it.
* '0' and '-1' are the only values returned by ide_dma_check()
so remove dead code for other cases.
There should be no functionality 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 7568c3e..0103630 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -827,22 +827,19 @@
ide_hwif_t *hwif = drive->hwif;
int rc;
+ /*
+ * Force DMAing for the beginning of the check.
+ * Some chipsets appear to do interesting
+ * things, if not checked and cleared.
+ * PARANOIA!!!
+ */
+ hwif->dma_off_quietly(drive);
+
rc = ide_dma_check(drive);
+ if (rc)
+ return rc;
- switch(rc) {
- case -1: /* DMA needs to be disabled */
- hwif->dma_off_quietly(drive);
- return -1;
- case 0: /* DMA needs to be enabled */
- return hwif->ide_dma_on(drive);
- case 1: /* DMA setting cannot be changed */
- break;
- default:
- BUG();
- break;
- }
-
- return rc;
+ return hwif->ide_dma_on(drive);
}
#ifdef CONFIG_BLK_DEV_IDEDMA_PCI