ide: add ->dma_check method
* Add (an optional) ->dma_check method for checking if DMA can be
used for a given command and fail DMA setup in ide_dma_prepare()
if necessary.
* Convert alim15x3 and trm290 host drivers to use ->dma_check.
* Rename ali15x3_dma_setup() to ali_dma_check() while at it.
There should be no functional 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 cf5897f..c0505e2 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -566,9 +566,12 @@
int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd)
{
+ const struct ide_dma_ops *dma_ops = drive->hwif->dma_ops;
+
if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 ||
+ (dma_ops->dma_check && dma_ops->dma_check(drive, cmd)) ||
ide_build_sglist(drive, cmd) == 0 ||
- drive->hwif->dma_ops->dma_setup(drive, cmd))
+ dma_ops->dma_setup(drive, cmd))
return 1;
return 0;
}