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ide: cleanup ide_set_dma()

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* ->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>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-01-25 22:17:19 +01:00
parent 23b1bd459c
commit 7b905994ce
4 changed files with 12 additions and 25 deletions
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25
drivers/ide/ide-dma.c
View File

@ -827,22 +827,19 @@ int ide_set_dma(ide_drive_t *drive)
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

1
drivers/ide/ide-io.c
View File

@ -221,7 +221,6 @@ static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *
*/
if (drive->hwif->ide_dma_on == NULL)
break;
drive->hwif->dma_off_quietly(drive);
/*
* TODO: respect ->using_dma setting
*/

10
drivers/ide/ide-probe.c
View File

@ -833,16 +833,8 @@ static void probe_hwif(ide_hwif_t *hwif)
drive->nice1 = 1;
if (hwif->ide_dma_on) {
/*
* 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);
if (hwif->ide_dma_on)
ide_set_dma(drive);
}
}
}

1
drivers/ide/ide.c
View File

@ -851,7 +851,6 @@ int set_using_dma(ide_drive_t *drive, int arg)
err = 0;
if (arg) {
hwif->dma_off_quietly(drive);
if (ide_set_dma(drive))
err = -EIO;
} else