3 files changed, 10 insertions, 4 deletions

diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
index 3408578b08d6..ff41c310c900 100644
--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -230,6 +230,7 @@ static struct {
         {"PIONEER", "CD-ROM DRM-624X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
         {"Promise", "VTrak E610f", NULL, BLIST_SPARSELUN | BLIST_NO_RSOC},
         {"Promise", "", NULL, BLIST_SPARSELUN},
+        {"QEMU", "QEMU CD-ROM", NULL, BLIST_SKIP_VPD_PAGES},
         {"QNAP", "iSCSI Storage", NULL, BLIST_MAX_1024},
         {"SYNOLOGY", "iSCSI Storage", NULL, BLIST_MAX_1024},
         {"QUANTUM", "XP34301", "1071", BLIST_NOTQ},
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index f459dff30512..60bff78e9ead 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2867,10 +2867,10 @@ static int sd_revalidate_disk(struct gendisk *disk)
         if (sdkp->opt_xfer_blocks &&
             sdkp->opt_xfer_blocks <= dev_max &&
             sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
-            sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_SIZE)
-                rw_max = q->limits.io_opt =
-                        sdkp->opt_xfer_blocks * sdp->sector_size;
-        else
+            logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
+                q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
+                rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
+        } else
                 rw_max = BLK_DEF_MAX_SECTORS;
 
         /* Combine with controller limits */
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 654630bb7d0e..765a6f1ac1b7 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -151,6 +151,11 @@ static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blo
         return blocks << (ilog2(sdev->sector_size) - 9);
 }
 
+static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
+{
+        return blocks * sdev->sector_size;
+}
+
 /*
  * A DIF-capable target device can be formatted with different
  * protection schemes.  Currently 0 through 3 are defined: