From: Randy Dunlap <randy_d_dunlap@linux.intel.com>

Add more libata-acpi debugging, plus controlled by libata.printk value.

Signed-off-by: Randy Dunlap <randy_d_dunlap@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/scsi/libata-acpi.c |   53 ++++++++++++++++++++++-------------
 1 files changed, 34 insertions(+), 19 deletions(-)

diff -puN drivers/scsi/libata-acpi.c~sata-acpi-objects-support-libata-acpimore-debugging drivers/scsi/libata-acpi.c
--- 25/drivers/scsi/libata-acpi.c~sata-acpi-objects-support-libata-acpimore-debugging	Tue Jan 17 16:14:16 2006
+++ 25-akpm/drivers/scsi/libata-acpi.c	Tue Jan 17 16:14:16 2006
@@ -365,17 +365,20 @@ int do_drive_get_GTF(struct ata_port *ap
 	status = acpi_evaluate_object(atadev->obj_handle, "_GTF",
 					NULL, &output);
 	if (ACPI_FAILURE(status)) {
-		printk(KERN_DEBUG
-			"%s: Run _GTF error: status = 0x%x\n",
-			__FUNCTION__, status);
+		if (ata_msg_probe(ap))
+			printk(KERN_DEBUG
+				"%s: Run _GTF error: status = 0x%x\n",
+				__FUNCTION__, status);
 		goto out;
 	}
 
 	if (!output.length || !output.pointer) {
-		printk(KERN_DEBUG
-			"%s: Run _GTF: length or ptr is NULL (0x%llx, 0x%p)\n",
-			__FUNCTION__,
-			(unsigned long long)output.length, output.pointer);
+		if (ata_msg_probe(ap))
+			printk(KERN_DEBUG "%s: Run _GTF: "
+				"length or ptr is NULL (0x%llx, 0x%p)\n",
+				__FUNCTION__,
+				(unsigned long long)output.length,
+				output.pointer);
 		acpi_os_free(output.pointer);
 		goto out;
 	}
@@ -383,23 +386,32 @@ int do_drive_get_GTF(struct ata_port *ap
 	out_obj = output.pointer;
 	if (out_obj->type != ACPI_TYPE_BUFFER) {
 		acpi_os_free(output.pointer);
-		printk(KERN_DEBUG "%s: Run _GTF: error: "
-			"expected object type of ACPI_TYPE_BUFFER, got 0x%x\n",
-			__FUNCTION__, out_obj->type);
+		if (ata_msg_probe(ap))
+			printk(KERN_DEBUG "%s: Run _GTF: error: "
+				"expected object type of ACPI_TYPE_BUFFER, "
+				"got 0x%x\n",
+				__FUNCTION__, out_obj->type);
 		err = -ENOENT;
 		goto out;
 	}
 
-	if (out_obj->buffer.length % REGS_PER_GTF) {
+	if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
+	    out_obj->buffer.length % REGS_PER_GTF) {
 		if (ata_msg_drv(ap))
-			printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
-				__FUNCTION__, out_obj->buffer.length);
+			printk(KERN_ERR
+				"%s: unexpected GTF length (%d) or addr (0x%p)\n",
+				__FUNCTION__, out_obj->buffer.length,
+				out_obj->buffer.pointer);
 		err = -ENOENT;
 		goto out;
 	}
 
 	*gtf_length = out_obj->buffer.length;
 	*gtf_address = (unsigned long)out_obj->buffer.pointer;
+	if (ata_msg_probe(ap))
+		printk(KERN_DEBUG "%s: returning "
+			"gtf_length=%d, gtf_address=0x%lx\n",
+			__FUNCTION__, *gtf_length, *gtf_address);
 	err = 0;
 out:
 	return err;
@@ -501,8 +513,9 @@ int do_drive_set_taskfiles(struct ata_po
 
 	if (ata_msg_probe(ap))
 		printk(KERN_DEBUG
-			"%s: total GTF bytes = %u (0x%x), gtf_count = %d\n",
-			__FUNCTION__, gtf_length, gtf_length, gtf_count);
+			"%s: total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
+			__FUNCTION__, gtf_length, gtf_length, gtf_count,
+			gtf_address);
 	if (gtf_length % REGS_PER_GTF) {
 		if (ata_msg_drv(ap))
 			printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
@@ -541,8 +554,9 @@ int ata_acpi_exec_tfs(struct ata_port *a
 		printk(KERN_DEBUG "%s: ENTER:\n", __FUNCTION__);
 
 	for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
-		printk(KERN_DEBUG "%s: call get_GTF, ix=%d\n",
-			__FUNCTION__, ix);
+		if (ata_msg_probe(ap))
+			printk(KERN_DEBUG "%s: call get_GTF, ix=%d\n",
+				__FUNCTION__, ix);
 		ret = do_drive_get_GTF(ap, &ap->device[ix],
 				&gtf_length, &gtf_address);
 		if (ret < 0) {
@@ -552,8 +566,9 @@ int ata_acpi_exec_tfs(struct ata_port *a
 			break;
 		}
 
-		printk(KERN_DEBUG "%s: call set_taskfiles, ix=%d\n",
-			__FUNCTION__, ix);
+		if (ata_msg_probe(ap))
+			printk(KERN_DEBUG "%s: call set_taskfiles, ix=%d\n",
+				__FUNCTION__, ix);
 		ret = do_drive_set_taskfiles(ap, &ap->device[ix],
 				gtf_length, gtf_address);
 		acpi_os_free((void *)gtf_address);
_