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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2008-01-19 15:51:26 +0000
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-01-19 21:29:39 -0800
commitaa8f2371c564fc9b289dab3a8ecd93212d021fd2 (patch)
treee8a8cd8e623ec37b68a0d7d9345b80898ceaa1f4 /drivers/ata/pata_pdc202xx_old.c
parent5db501d7e398c6a838a307adf0347cf6a2b015a3 (diff)
pata_pdc202xx_old: Fix crashes with ATAPI
The PDC202xx older devices do not support ATAPI DMA via the usual interfaces. What documentation I have isn't sufficient to support DMA and it isn't clear if the Windows drivers do this or it is possible at all. (Neither do the drivers/ide old drivers) So turn it ATAPI DMA off, these are disk optimised controllers. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/ata/pata_pdc202xx_old.c')
-rw-r--r--drivers/ata/pata_pdc202xx_old.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/ata/pata_pdc202xx_old.c b/drivers/ata/pata_pdc202xx_old.c
index 8f2815601791..6c9689b59b06 100644
--- a/drivers/ata/pata_pdc202xx_old.c
+++ b/drivers/ata/pata_pdc202xx_old.c
@@ -244,6 +244,24 @@ static int pdc2026x_port_start(struct ata_port *ap)
return ata_sff_port_start(ap);
}
+/**
+ * pdc2026x_check_atapi_dma - Check whether ATAPI DMA can be supported for this command
+ * @qc: Metadata associated with taskfile to check
+ *
+ * Just say no - not supported on older Promise.
+ *
+ * LOCKING:
+ * None (inherited from caller).
+ *
+ * RETURNS: 0 when ATAPI DMA can be used
+ * 1 otherwise
+ */
+
+static int pdc2026x_check_atapi_dma(struct ata_queued_cmd *qc)
+{
+ return 1;
+}
+
static struct scsi_host_template pdc202xx_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
@@ -311,6 +329,7 @@ static struct ata_port_operations pdc2026x_port_ops = {
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.cable_detect = pdc2026x_cable_detect,
+ .check_atapi_dma= pdc2026x_check_atapi_dma,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = pdc2026x_bmdma_start,
.bmdma_stop = pdc2026x_bmdma_stop,