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Commit e1cc9de8 authored by Alan Cox's avatar Alan Cox Committed by Jeff Garzik
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libata-sff: Fix documentation 



Code moved to ioread/iowrite but the comment didn't
Also note a posting issue

Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 0e3dbc01

drivers/ata/libata-sff.c

+4 −1
Original line number Diff line number Diff line
@@ -297,7 +297,7 @@ void ata_bmdma_start (struct ata_queued_cmd *qc) 
	dmactl = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);

	iowrite8(dmactl | ATA_DMA_START, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);



	/* Strictly, one may wish to issue a readb() here, to

	/* Strictly, one may wish to issue an ioread8() here, to

	 * flush the mmio write.  However, control also passes

	 * to the hardware at this point, and it will interrupt

	 * us when we are to resume control.  So, in effect,
@@ -307,6 +307,9 @@ void ata_bmdma_start (struct ata_queued_cmd *qc) 
	 * is expected, so I think it is best to not add a readb()

	 * without first all the MMIO ATA cards/mobos.

	 * Or maybe I'm just being paranoid.

	 *

	 * FIXME: The posting of this write means I/O starts are

	 * unneccessarily delayed for MMIO

	 */

}