Mark Lord wrote:
Resending, with a bug fixed, and default ata16_passthru=0.
This patch adds support for issuing ATA_16 passthru commands
to ATAPI devices managed by libata. It requires the previous
CDB length fix patch.
A boot/module parameter, "ata16_passthru=1" can be used to
globally disable this feature, if ever desired.
Signed-Off-By: Mark :ord <mlord@xxxxxxxxx>
---
diff -u --recursive --new-file --exclude-from=old/Documentation/dontdiff
old/drivers/ata/libata-core.c new/drivers/ata/libata-core.c
--- old/drivers/ata/libata-core.c 2007-02-02 12:29:10.000000000 -0500
+++ new/drivers/ata/libata-core.c 2007-02-02 12:29:03.000000000 -0500
@@ -82,6 +82,10 @@
module_param(atapi_dmadir, int, 0444);
MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support
(0=off, 1=on)");
+int ata16_passthru = 0;
+module_param(ata16_passthru, int, 0444);
+MODULE_PARM_DESC(ata16_passthru, "Enable passthru of SCSI opcode 0x85
to ATAPI devices (0=off, 1=on)");
+
int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
diff -u --recursive --new-file --exclude-from=old/Documentation/dontdiff
old/drivers/ata/libata-scsi.c new/drivers/ata/libata-scsi.c
--- old/drivers/ata/libata-scsi.c 2007-02-02 12:29:10.000000000 -0500
+++ new/drivers/ata/libata-scsi.c 2007-02-02 12:29:25.000000000 -0500
@@ -2688,6 +2688,10 @@
static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev,
u8 cmd)
{
+ if (dev->class == ATA_DEV_ATAPI)
+ if (cmd != ATA_16 || ata16_passthru)
+ return atapi_xlat;
+
switch (cmd) {
case READ_6:
case READ_10:
@@ -2746,27 +2750,28 @@
void (*done)(struct scsi_cmnd *),
struct ata_device *dev)
{
- int rc = 0;
-
- if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) {
- DPRINTK("bad CDB len=%u, max=%u\n",
- scmd->cmd_len, dev->cdb_len);
+ ata_xlat_func_t xlat_func;
+ int rc = 0, max_len;
+ u8 scsi_op = scmd->cmnd[0];
+
+ if (scsi_op == ATA_16 && dev->class == ATA_DEV_ATAPI &&
!ata16_passthru)
+ max_len = 16;
+ else
+ max_len = dev->cdb_len;
+ + if (unlikely(!scmd->cmd_len || scmd->cmd_len > max_len)) {
+ DPRINTK("bad CDB len=%u, max=%u\n",
+ scmd->cmd_len, max_len);
looks like a chompified patch (double '+')
scmd->result = DID_ERROR << 16;
done(scmd);
return 0;
}
- if (dev->class == ATA_DEV_ATA) {
- ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
- scmd->cmnd[0]);
-
- if (xlat_func)
- rc = ata_scsi_translate(dev, scmd, done, xlat_func);
- else
- ata_scsi_simulate(dev, scmd, done);
- } else
- rc = ata_scsi_translate(dev, scmd, done, atapi_xlat);
-
+ xlat_func = ata_get_xlat_func(dev, scsi_op);
+ if (xlat_func)
+ rc = ata_scsi_translate(dev, scmd, done, xlat_func);
+ else
+ ata_scsi_simulate(dev, scmd, done);
return rc;
this looks like a bug? ata_scsi_simulate() should not be called for
ATAPI devices.
-
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