ide: clear bmdma status in ide_intr() for ICHx controllers (revised #4)

patch 1/2 (revised):
- Fix drive->waiting_for_dma to work with CDB-intr devices.
- Do the dma status clearing in ide_intr() and add a new
  hwif->ide_dma_clear_irq for Intel ICHx controllers.

Revised per Alan, Sergei and Bart's advice.

Patch against 2.6.20-rc6. Tested ok on my ICH4 and pdc20275 adapters.
Please review/apply, thanks.

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Adam W. Hawks" <awhawks@us.ibm.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 04e0fa97ac99..1c17dee839d4 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -738,6 +738,7 @@ typedef struct hwif_s {
         int (*ide_dma_on)(ide_drive_t *drive);
         int (*ide_dma_off_quietly)(ide_drive_t *drive);
         int (*ide_dma_test_irq)(ide_drive_t *drive);
+        void (*ide_dma_clear_irq)(ide_drive_t *drive);
         int (*ide_dma_host_on)(ide_drive_t *drive);
         int (*ide_dma_host_off)(ide_drive_t *drive);
         int (*ide_dma_lostirq)(ide_drive_t *drive);