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-rw-r--r--drivers/usb/storage/transport.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
index 00418995d8e..e8ae21b2d38 100644
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -819,6 +819,35 @@ Retry_Sense:
}
}
+ /*
+ * Some devices don't work or return incorrect data the first
+ * time they get a READ(10) command, or for the first READ(10)
+ * after a media change. If the INITIAL_READ10 flag is set,
+ * keep track of whether READ(10) commands succeed. If the
+ * previous one succeeded and this one failed, set the REDO_READ10
+ * flag to force a retry.
+ */
+ if (unlikely((us->fflags & US_FL_INITIAL_READ10) &&
+ srb->cmnd[0] == READ_10)) {
+ if (srb->result == SAM_STAT_GOOD) {
+ set_bit(US_FLIDX_READ10_WORKED, &us->dflags);
+ } else if (test_bit(US_FLIDX_READ10_WORKED, &us->dflags)) {
+ clear_bit(US_FLIDX_READ10_WORKED, &us->dflags);
+ set_bit(US_FLIDX_REDO_READ10, &us->dflags);
+ }
+
+ /*
+ * Next, if the REDO_READ10 flag is set, return a result
+ * code that will cause the SCSI core to retry the READ(10)
+ * command immediately.
+ */
+ if (test_bit(US_FLIDX_REDO_READ10, &us->dflags)) {
+ clear_bit(US_FLIDX_REDO_READ10, &us->dflags);
+ srb->result = DID_IMM_RETRY << 16;
+ srb->sense_buffer[0] = 0;
+ }
+ }
+
/* Did we transfer less than the minimum amount required? */
if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) &&
scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow)