[patch 48/48] ide-cd: fix DMA for non bio-backed requests

[Greg KH <gregkh@suse.de>]

[-- Attachment #1: ide-cd-fix-dma-for-non-bio-backed-requests.patch --]
[-- Type: text/plain, Size: 1526 bytes --]

2.6.28-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Borislav Petkov <petkovbb@googlemail.com>

commit 9e772d0135a5b5f8355320be429efa339700d52d upstream.

This one fixes http://bugzilla.kernel.org/show_bug.cgi?id=12320.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/ide/ide-cd.c |    3 +++
 drivers/ide/ide-io.c |    9 ++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -984,6 +984,9 @@ static ide_startstop_t cdrom_newpc_intr(
 		if (blk_fs_request(rq)) {
 			ide_end_request(drive, 1, rq->nr_sectors);
 			return ide_stopped;
+		} else if (rq->cmd_type == REQ_TYPE_ATA_PC && !rq->bio) {
+			ide_end_request(drive, 1, 1);
+			return ide_stopped;
 		}
 		goto end_request;
 	}
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -577,11 +577,14 @@ void ide_map_sg(ide_drive_t *drive, stru
 	if (hwif->sg_mapped)	/* needed by ide-scsi */
 		return;
 
-	if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) {
-		hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
-	} else {
+	if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
 		sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
 		hwif->sg_nents = 1;
+	} else if (!rq->bio) {
+		sg_init_one(sg, rq->data, rq->data_len);
+		hwif->sg_nents = 1;
+	} else {
+		hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
 	}
 }