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>

2 files changed, 16 insertions, 2 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;
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 3eab1c6c9b31..317ec62c33d4 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -327,8 +327,10 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
                 return ide_stopped;
         }
 
-        ide_init_sg_cmd(drive, rq);
-        ide_map_sg(drive, rq);
+        if (blk_fs_request(rq) || pc->req_xfer) {
+                ide_init_sg_cmd(drive, rq);
+                ide_map_sg(drive, rq);
+        }
 
         pc->sg = hwif->sg_table;
         pc->sg_cnt = hwif->sg_nents;