Messages in this thread Patch in this message | | | Date | Mon, 26 Jan 2009 19:12:56 +0000 | From | Alan Cox <> | Subject | Re: 2.6.29-rc libata sff 32bit PIO regression |
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And while we are at it fix the 32bit PIO handling for VLB for this case too
pata_legacy: For VLB 32bit PIO don't try tricks with slop
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
These devices are generally used with ATA anyway and it seems that some ATAPI will need us to issue the right number of words. Therefore as we can't switch mid burst on VLB devices we should only use 32bit I/O for suitable block sizes. ---
drivers/ata/pata_legacy.c | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/ata/pata_legacy.c b/drivers/ata/pata_legacy.c index 6c1d778..e3bc1b4 100644 --- a/drivers/ata/pata_legacy.c +++ b/drivers/ata/pata_legacy.c @@ -283,9 +283,10 @@ static void pdc20230_set_piomode(struct ata_port *ap, struct ata_device *adev) static unsigned int pdc_data_xfer_vlb(struct ata_device *dev, unsigned char *buf, unsigned int buflen, int rw) { - if (ata_id_has_dword_io(dev->id)) { + int slop = buflen & 3; + /* 32bit I/O capable *and* we need to write a whole number of dwords */ + if (ata_id_has_dword_io(dev->id) && (slop == 0 || slop == 3)) { struct ata_port *ap = dev->link->ap; - int slop = buflen & 3; unsigned long flags; local_irq_save(flags); @@ -735,7 +736,7 @@ static unsigned int vlb32_data_xfer(struct ata_device *adev, unsigned char *buf, struct ata_port *ap = adev->link->ap; int slop = buflen & 3; - if (ata_id_has_dword_io(adev->id)) { + if (ata_id_has_dword_io(adev->id) && (slop == 0 || slop == 3)) { if (rw == WRITE) iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2); else
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