Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  [libata] ahci: SB600 workaround is suspect... play it safe for now
  sata_promise: fix hardreset hotplug events, take 2
  libata: improve HPA error handling
  libata: assume no device is attached if both IDENTIFYs are aborted
  pata_it821x: use raw nbytes in check_atapi_dma
  libata: implement ata_qc_raw_nbytes()

1 files changed, 28 insertions, 18 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 4bbe31f..c4248b3 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1416,12 +1416,12 @@ static int ata_hpa_resize(struct ata_device *dev)
 	/* read native max address */
 	rc = ata_read_native_max_address(dev, &native_sectors);
 	if (rc) {
-		/* If HPA isn't going to be unlocked, skip HPA
-		 * resizing from the next try.
+		/* If device aborted the command or HPA isn't going to
+		 * be unlocked, skip HPA resizing.
 		 */
-		if (!ata_ignore_hpa) {
+		if (rc == -EACCES || !ata_ignore_hpa) {
 			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
-				       "broken, will skip HPA handling\n");
+				       "broken, skipping HPA handling\n");
 			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
 
 			/* we can continue if device aborted the command */
@@ -2092,24 +2092,34 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
 				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
 	if (err_mask) {
 		if (err_mask & AC_ERR_NODEV_HINT) {
-			DPRINTK("ata%u.%d: NODEV after polling detection\n",
-				ap->print_id, dev->devno);
+			ata_dev_printk(dev, KERN_DEBUG,
+				       "NODEV after polling detection\n");
 			return -ENOENT;
 		}
 
-		/* Device or controller might have reported the wrong
-		 * device class.  Give a shot at the other IDENTIFY if
-		 * the current one is aborted by the device.
-		 */
-		if (may_fallback &&
-		    (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
-			may_fallback = 0;
+		if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
+			/* Device or controller might have reported
+			 * the wrong device class.  Give a shot at the
+			 * other IDENTIFY if the current one is
+			 * aborted by the device.
+			 */
+			if (may_fallback) {
+				may_fallback = 0;
 
-			if (class == ATA_DEV_ATA)
-				class = ATA_DEV_ATAPI;
-			else
-				class = ATA_DEV_ATA;
-			goto retry;
+				if (class == ATA_DEV_ATA)
+					class = ATA_DEV_ATAPI;
+				else
+					class = ATA_DEV_ATA;
+				goto retry;
+			}
+
+			/* Control reaches here iff the device aborted
+			 * both flavors of IDENTIFYs which happens
+			 * sometimes with phantom devices.
+			 */
+			ata_dev_printk(dev, KERN_DEBUG,
+				       "both IDENTIFYs aborted, assuming NODEV\n");
+			return -ENOENT;
 		}
 
 		rc = -EIO;