1 files changed, 19 insertions, 37 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index adfae9d1ceb1..bfc59a104728 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -600,8 +600,9 @@ static const char *sata_spd_string(unsigned int spd)
 
 void ata_dev_disable(struct ata_device *dev)
 {
-	if (ata_dev_enabled(dev) && ata_msg_drv(dev->ap)) {
-		ata_dev_printk(dev, KERN_WARNING, "disabled\n");
+	if (ata_dev_enabled(dev)) {
+		if (ata_msg_drv(dev->ap))
+			ata_dev_printk(dev, KERN_WARNING, "disabled\n");
 		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
 					     ATA_DNXFER_QUIET);
 		dev->class++;
@@ -983,11 +984,6 @@ static u64 ata_hpa_resize(struct ata_device *dev)
 	else
 		hpa_sectors = ata_read_native_max_address(dev);
 
-	/* if no hpa, both should be equal */
-	ata_dev_printk(dev, KERN_INFO, "%s 1: sectors = %lld, "
-				"hpa_sectors = %lld\n",
-		__FUNCTION__, (long long)sectors, (long long)hpa_sectors);
-
 	if (hpa_sectors > sectors) {
 		ata_dev_printk(dev, KERN_INFO,
 			"Host Protected Area detected:\n"
@@ -1009,7 +1005,11 @@ static u64 ata_hpa_resize(struct ata_device *dev)
 				return hpa_sectors;
 			}
 		}
-	}
+	} else if (hpa_sectors < sectors)
+		ata_dev_printk(dev, KERN_WARNING, "%s 1: hpa sectors (%lld) "
+			       "is smaller than sectors (%lld)\n", __FUNCTION__,
+			       (long long)hpa_sectors, (long long)sectors);
+
 	return sectors;
 }
 
@@ -2046,10 +2046,6 @@ int ata_dev_configure(struct ata_device *dev)
 		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
 					 dev->max_sectors);
 
-	/* limit ATAPI DMA to R/W commands only */
-	if (ata_device_blacklisted(dev) & ATA_HORKAGE_DMA_RW_ONLY)
-		dev->horkage |= ATA_HORKAGE_DMA_RW_ONLY;
-
 	if (ap->ops->dev_config)
 		ap->ops->dev_config(dev);
 
@@ -3780,8 +3776,7 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
 	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
 
 	/* Weird ATAPI devices */
-	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 |
-						ATA_HORKAGE_DMA_RW_ONLY },
+	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
 
 	/* Devices we expect to fail diagnostics */
 
@@ -4109,6 +4104,7 @@ static void ata_fill_sg(struct ata_queued_cmd *qc)
 	if (idx)
 		ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
 }
+
 /**
  *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
  *	@qc: Metadata associated with taskfile to check
@@ -4126,33 +4122,19 @@ static void ata_fill_sg(struct ata_queued_cmd *qc)
 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
 {
 	struct ata_port *ap = qc->ap;
-	int rc = 0; /* Assume ATAPI DMA is OK by default */
-
-	/* some drives can only do ATAPI DMA on read/write */
-	if (unlikely(qc->dev->horkage & ATA_HORKAGE_DMA_RW_ONLY)) {
-		struct scsi_cmnd *cmd = qc->scsicmd;
-		u8 *scsicmd = cmd->cmnd;
-
-		switch (scsicmd[0]) {
-		case READ_10:
-		case WRITE_10:
-		case READ_12:
-		case WRITE_12:
-		case READ_6:
-		case WRITE_6:
-			/* atapi dma maybe ok */
-			break;
-		default:
-			/* turn off atapi dma */
-			return 1;
-		}
-	}
+
+	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
+	 * few ATAPI devices choke on such DMA requests.
+	 */
+	if (unlikely(qc->nbytes & 15))
+		return 1;
 
 	if (ap->ops->check_atapi_dma)
-		rc = ap->ops->check_atapi_dma(qc);
+		return ap->ops->check_atapi_dma(qc);
 
-	return rc;
+	return 0;
 }
+
 /**
  *	ata_qc_prep - Prepare taskfile for submission
  *	@qc: Metadata associated with taskfile to be prepared