1 files changed, 20 insertions, 7 deletions

diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 5715291ba540..e1072d52d641 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -72,12 +72,27 @@ static const char* host_info(struct Scsi_Host *host)
 
 static int slave_alloc (struct scsi_device *sdev)
 {
+        struct us_data *us = host_to_us(sdev->host);
+
         /*
          * Set the INQUIRY transfer length to 36.  We don't use any of
          * the extra data and many devices choke if asked for more or
          * less than 36 bytes.
          */
         sdev->inquiry_len = 36;
+
+        /*
+         * The UFI spec treates the Peripheral Qualifier bits in an
+         * INQUIRY result as reserved and requires devices to set them
+         * to 0.  However the SCSI spec requires these bits to be set
+         * to 3 to indicate when a LUN is not present.
+         *
+         * Let the scanning code know if this target merely sets
+         * Peripheral Device Type to 0x1f to indicate no LUN.
+         */
+        if (us->subclass == US_SC_UFI)
+                sdev->sdev_target->pdt_1f_for_no_lun = 1;
+
         return 0;
 }
 
@@ -112,13 +127,11 @@ static int slave_configure(struct scsi_device *sdev)
         if (sdev->scsi_level < SCSI_2)
                 sdev->scsi_level = sdev->sdev_target->scsi_level = SCSI_2;
 
-        /* According to the technical support people at Genesys Logic,
-         * devices using their chips have problems transferring more than
-         * 32 KB at a time.  In practice people have found that 64 KB
-         * works okay and that's what Windows does.  But we'll be
-         * conservative; people can always use the sysfs interface to
-         * increase max_sectors. */
-        if (le16_to_cpu(us->pusb_dev->descriptor.idVendor) == USB_VENDOR_ID_GENESYS &&
+        /* Many devices have trouble transfering more than 32KB at a time,
+         * while others have trouble with more than 64K. At this time we
+         * are limiting both to 32K (64 sectores).
+         */
+        if ((us->flags & US_FL_MAX_SECTORS_64) &&
                         sdev->request_queue->max_sectors > 64)
                 blk_queue_max_sectors(sdev->request_queue, 64);