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| author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2007-09-20 18:03:07 +0400 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-09-20 23:58:26 +0400 |
| commit | e1cc9de8361f267101402a1181cff4d3d3225a6d (patch) | |
| tree | ddb57a3bd49a33cb869a399daa6ba094f20fa26c /drivers/ata/libata-sff.c | |
| parent | 0e3dbc01d53940fe10e5a5cfec15ede3e929c918 (diff) | |
| download | linux-e1cc9de8361f267101402a1181cff4d3d3225a6d.tar.xz | |
libata-sff: Fix documentation
Code moved to ioread/iowrite but the comment didn't
Also note a posting issue
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/libata-sff.c')
| -rw-r--r-- | drivers/ata/libata-sff.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c index 1cce2198baaf..8023167bbbeb 100644 --- a/drivers/ata/libata-sff.c +++ b/drivers/ata/libata-sff.c @@ -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 */ } |