Hi,
I have a system where I have a simple IDE controller that sits on a
local bus without bus master dma capability, and thus no dma_mapping
ops defined for the device/bus.
pata_platform works great for me, with the exception of using the generic
ata_port_start which tries to do a dmam_alloc_coherent.
Looks like it doesn't need to allocate a prd table at all, so replace it
with a dummy function instead.
Signed-off-by: Olof Johansson <olof@xxxxxxxxx>
diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c
index 4b82a54..a0aede1 100644
--- a/drivers/ata/pata_platform.c
+++ b/drivers/ata/pata_platform.c
@@ -48,6 +48,8 @@ static int pata_platform_set_mode(struct ata_port *ap, struct ata_device **unuse
return 0;
}
+static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
+
static struct scsi_host_template pata_platform_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
@@ -91,7 +93,7 @@ static struct ata_port_operations pata_platform_port_ops = {
.irq_on = ata_irq_on,
.irq_ack = ata_irq_ack,
- .port_start = ata_port_start,
+ .port_start = ata_dummy_ret0,
};
static void pata_platform_setup_port(struct ata_ioports *ioaddr,
-
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