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>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/ide.h b/include/linux/ide.h
index 78892e2a432c..b350667b83ad 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -717,6 +717,7 @@ struct ide_dma_ops {
         int     (*dma_test_irq)(struct ide_drive_s *);
         void    (*dma_lost_irq)(struct ide_drive_s *);
         /* below ones are optional */
+        int     (*dma_check)(struct ide_drive_s *, struct ide_cmd *);
         int     (*dma_timer_expiry)(struct ide_drive_s *);
         void    (*dma_clear)(struct ide_drive_s *);
         /*