1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 8a894fa37b53..757e5956b132 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -415,6 +415,12 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
                 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
                         dsc = 1;
 
+                /*
+                 * ->pc_callback() might change rq->data_len for
+                 * residual count, cache total length.
+                 */
+                done = blk_rq_bytes(rq);
+
                 /* Command finished - Call the callback function */
                 uptodate = drive->pc_callback(drive, dsc);