Re: [PATCH 01/18] ide: add ->read_sff_dma_status method

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Bartlomiej Zolnierkiewicz wrote:

Add ->read_sff_dma_status method for reading DMA Status register
and use it instead of ->INB.

While at it:

* Use inb() directly in ns87415.c::ns87415_dma_end().

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>

Index: b/drivers/ide/ide-iops.c
===================================================================
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -103,6 +103,14 @@ void SELECT_MASK(ide_drive_t *drive, int
 		port_ops->maskproc(drive, mask);
 }
+static u8 ide_read_sff_dma_status(ide_hwif_t *hwif)
+{
+	if (hwif->host_flags & IDE_HFLAG_MMIO)
+		return readb((void __iomem *)hwif->dma_status);
+	else
+		return inb(hwif->dma_status);
+}
+

It's probably too late to object now (and I've been busy before) but I don't understand how reading DMA status ended up here ISO ide-dma.c...

 static void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
 {
 	ide_hwif_t *hwif = drive->hwif;
@@ -323,6 +331,8 @@ static void ata_output_data(ide_drive_t void default_hwif_transport(ide_hwif_t *hwif)
 {
+	hwif->read_sff_dma_status = ide_read_sff_dma_status;
+
 	hwif->tf_load	  = ide_tf_load;
 	hwif->tf_read	  = ide_tf_read;

I also didn't understand the motivation behind putting this method together with the transport operations... IMO, DMA programming interface hardly has anything to do with transporting the data over IDE bus.

MBR, Sergei
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