On Wednesday 03 January 2007 00:47, Mark Lord wrote:
> Jeff Garzik wrote:
> > As I said, provide some avenue for the user to choose.
This patch isn't really needed, but it might provide an "out"
just in case somebody has some really non-compliant hardware
out there someday.
Add a boot/module parameter for libata to force the ATA_16
SCSI opcode to not be interpreted as a standards-compliant
ATA passthrough mechanism when used on an ATAPI device
-- instead, it gets passed directly to the ATAPI device.
Signed-off-by: Mark Lord <mlord@xxxxxxxxx>
--- old/drivers/ata/libata.h 2007-01-02 19:06:56.000000000 -0500
+++ linux/drivers/ata/libata.h 2007-01-03 00:55:01.000000000 -0500
@@ -46,6 +46,7 @@
extern struct workqueue_struct *ata_aux_wq;
extern int atapi_enabled;
+extern int atapi_passthru;
extern int atapi_dmadir;
extern int libata_fua;
extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);
--- old/drivers/ata/libata-core.c 2007-01-02 19:09:06.000000000 -0500
+++ linux/drivers/ata/libata-core.c 2007-01-03 00:52:51.000000000 -0500
@@ -78,6 +78,10 @@
module_param(atapi_enabled, int, 0444);
MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
+int atapi_passthru = 0;
+module_param(atapi_passthru, int, 0444);
+MODULE_PARM_DESC(atapi_passthru, "Enable passthru of SCSI opcode 0x85 to ATAPI devices");
+
int atapi_dmadir = 0;
module_param(atapi_dmadir, int, 0444);
MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
--- old/drivers/ata/libata-scsi.c 2007-01-02 19:20:49.000000000 -0500
+++ linux/drivers/ata/libata-scsi.c 2007-01-03 00:55:08.000000000 -0500
@@ -2650,7 +2650,7 @@
static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
{
- if (cmd == ATA_16)
+ if (cmd == ATA_16 && !atapi_passthru)
return ata_scsi_pass_thru;
if (dev->class == ATA_DEV_ATAPI)
-
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