Hopefully there is a better long term solution but for now lets favour
reliability.
Signed-off-by: Alan Cox <[EMAIL PROTECTED]>
diff -u --new-file --recursive --exclude-from /usr/src/exclude
linux.vanilla-2.6.24-rc2-mm1/drivers/ata/pata_ali.c
linux-2.6.24-rc2-mm1/drivers/ata/pata_ali.c
--- linux.vanilla-2.6.24-rc2-mm1/drivers/ata/pata_ali.c 2007-11-16
17:55:11.000000000 +0000
+++ linux-2.6.24-rc2-mm1/drivers/ata/pata_ali.c 2007-11-16 18:12:21.000000000
+0000
@@ -282,6 +285,21 @@
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,
@@ -378,6 +396,7 @@
.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,
@@ -415,6 +434,7 @@
.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,
-
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