ide: remove ->ide_dma_check (take 2)

* Add IDE_HFLAG_TRUST_BIOS_FOR_DMA host flag for host drivers that depend
  on BIOS for programming device/controller for DMA.  Set it in cy82c693,
  generic, ns87415, opti621 and trm290 host drivers.

* Add IDE_HFLAG_VDMA host flag for host drivers using VDMA.  Set it in cs5520
  host driver.

* Teach ide_tune_dma() about IDE_HFLAG_TRUST_BIOS_FOR_DMA flag.

* Add generic ide_dma_check() helper and remove all open coded ->ide_dma_check
  implementations.  Fix all places checking for presence of ->ide_dma_check
  hook to check for ->ide_dma_on instead.

* Remove no longer needed code from config_drive_for_dma().

* Make ide_tune_dma() static.

v2:
* Fix config_drive_for_dma() return values.

* Fix ide-dma.c build for CONFIG_BLK_DEV_IDEDMA_PCI=n by adding
  dummy config_drive_for_dma() inline.

* Fix IDE_HFLAG_TRUST_BIOS_FOR_DMA handling in ide_dma_check().

* Fix init_hwif_it8213() comment.

There should be no functionality changes caused by this patch.

Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 5c0e4078b5cb..4834cca5cb31 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -418,7 +418,6 @@ static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
         hwif->dma_start                 = tmp_hwif->dma_start;
         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
-        hwif->ide_dma_check             = tmp_hwif->ide_dma_check;
         hwif->ide_dma_on                = tmp_hwif->ide_dma_on;
         hwif->dma_off_quietly           = tmp_hwif->dma_off_quietly;
         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
@@ -823,7 +822,7 @@ int set_using_dma(ide_drive_t *drive, int arg)
         if (!drive->id || !(drive->id->capability & 1))
                 goto out;
 
-        if (hwif->ide_dma_check == NULL)
+        if (hwif->ide_dma_on == NULL)
                 goto out;
 
         err = -EBUSY;