1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
index 22c7d4360fa2..b1d815eb6d0b 100644
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -1118,6 +1118,31 @@ int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
                  */
                 if (result == USB_STOR_XFER_LONG)
                         fake_sense = 1;
+
+                /*
+                 * Sometimes a device will mistakenly skip the data phase
+                 * and go directly to the status phase without sending a
+                 * zero-length packet.  If we get a 13-byte response here,
+                 * check whether it really is a CSW.
+                 */
+                if (result == USB_STOR_XFER_SHORT &&
+                                srb->sc_data_direction == DMA_FROM_DEVICE &&
+                                transfer_length - scsi_get_resid(srb) ==
+                                        US_BULK_CS_WRAP_LEN) {
+                        struct scatterlist *sg = NULL;
+                        unsigned int offset = 0;
+
+                        if (usb_stor_access_xfer_buf((unsigned char *) bcs,
+                                        US_BULK_CS_WRAP_LEN, srb, &sg,
+                                        &offset, FROM_XFER_BUF) ==
+                                                US_BULK_CS_WRAP_LEN &&
+                                        bcs->Signature ==
+                                                cpu_to_le32(US_BULK_CS_SIGN)) {
+                                usb_stor_dbg(us, "Device skipped data phase\n");
+                                scsi_set_resid(srb, transfer_length);
+                                goto skipped_data_phase;
+                        }
+                }
         }
 
         /* See flow chart on pg 15 of the Bulk Only Transport spec for
@@ -1153,6 +1178,7 @@ int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
         if (result != USB_STOR_XFER_GOOD)
                 return USB_STOR_TRANSPORT_ERROR;
 
+ skipped_data_phase:
         /* check bulk status */
         residue = le32_to_cpu(bcs->Residue);
         usb_stor_dbg(us, "Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n",