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| author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-01-25 22:17:19 +0100 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-01-25 22:17:19 +0100 |
| commit | 7b905994ce0bd332afc5ebc30ce9afa60d23c6e2 (patch) | |
| tree | 4f0f25616d816087e0022dce95f996c99c8dcc6e /drivers/ide/ide-dma.c | |
| parent | ide: remove redundant ->ide_dma_on call from set_using_dma() (diff) | |
| download | linux-7b905994ce0bd332afc5ebc30ce9afa60d23c6e2.tar.xz linux-7b905994ce0bd332afc5ebc30ce9afa60d23c6e2.zip | |
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>
Diffstat (limited to 'drivers/ide/ide-dma.c')
| -rw-r--r-- | drivers/ide/ide-dma.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c index 7568c3e81f2f..01036305d6fc 100644 --- a/drivers/ide/ide-dma.c +++ b/drivers/ide/ide-dma.c @@ -827,22 +827,19 @@ int ide_set_dma(ide_drive_t *drive) ide_hwif_t *hwif = drive->hwif; int rc; - rc = ide_dma_check(drive); + /* + * 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); - 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; - } + rc = ide_dma_check(drive); + if (rc) + return rc; - return rc; + return hwif->ide_dma_on(drive); } #ifdef CONFIG_BLK_DEV_IDEDMA_PCI |