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>

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index e96c012..e9d042d 100644 (file)
--- 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 3eab1c6..317ec62 100644 (file)
--- 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;