ide-floppy: do not map dataless cmds to an sg

since it fails the virt_to_page() translation check with DEBUG_VIRTUAL
enabled.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
[bart: backport to Linus' tree]
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index e96c01260598..e9d042dba0e0 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -140,6 +140,12 @@ static void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
         rq->cmd_flags |= REQ_PREEMPT;
         rq->buffer = (char *)pc;
         rq->rq_disk = disk;
+
+        if (pc->req_xfer) {
+                rq->data = pc->buf;
+                rq->data_len = pc->req_xfer;
+        }
+
         memcpy(rq->cmd, pc->c, 12);
         if (drive->media == ide_tape)
                 rq->cmd[13] = REQ_IDETAPE_PC1;
@@ -159,6 +165,12 @@ int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
         rq->cmd_type = REQ_TYPE_SPECIAL;
         rq->buffer = (char *)pc;
+
+        if (pc->req_xfer) {
+                rq->data = pc->buf;
+                rq->data_len = pc->req_xfer;
+        }
+
         memcpy(rq->cmd, pc->c, 12);
         if (drive->media == ide_tape)
                 rq->cmd[13] = REQ_IDETAPE_PC1;