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pata_ali: Lots of problems still showing up with small ATAPI DMA 

Hopefully there is a better long term solution but for now lets favour
reliability.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox 2007-11-19 14:37:58 +00:00 committed by Jeff Garzik
parent 8f59a13acc
commit 498222f323
1 changed files with 17 additions and 0 deletions
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17
drivers/ata/pata_ali.c
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@ -285,6 +285,21 @@ static void ali_lock_sectors(struct ata_device *adev)
adev->max_sectors = 255;
}
/**
* ali_check_atapi_dma - DMA check for most ALi controllers
* @adev: Device
*
* Called to decide whether commands should be sent by DMA or PIO
*/
static int ali_check_atapi_dma(struct ata_queued_cmd *qc)
{
/* If its not a media command, its not worth it */
if (qc->nbytes < 2048)
return -EOPNOTSUPP;
return 0;
}
static struct scsi_host_template ali_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
@ -381,6 +396,7 @@ static struct ata_port_operations ali_c2_port_ops = {
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_atapi_dma = ali_check_atapi_dma,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
@ -418,6 +434,7 @@ static struct ata_port_operations ali_c5_port_ops = {
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_atapi_dma = ali_check_atapi_dma,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,