---

yaml
---
r: 102068
b: refs/heads/master
c: e5318b5
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0b6abc17700a7843b165c677da0ac94522f83083
+refs/heads/master: e5318b531b008c79d2a0c0df06a7b8628da38e2f

trunk/drivers/ide/ide-cd.c

@@ -1191,12 +1191,17 @@ static ide_startstop_t cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
 	info->dma = 0;
 
 	/* sg request */
-	if (rq->bio) {
-		int mask = drive->queue->dma_alignment;
-		unsigned long addr =
-			(unsigned long)page_address(bio_page(rq->bio));
+	if (rq->bio || ((rq->cmd_type == REQ_TYPE_ATA_PC) && rq->data_len)) {
+		struct request_queue *q = drive->queue;
+		unsigned int alignment;
+		unsigned long addr;
 		unsigned long stack_mask = ~(THREAD_SIZE - 1);
 
+		if (rq->bio)
+			addr = (unsigned long)bio_data(rq->bio);
+		else
+			addr = (unsigned long)rq->data;
+
 		info->dma = drive->using_dma;
 
 		/*
@@ -1205,7 +1210,8 @@ static ide_startstop_t cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
 		 * NOTE! The "len" and "addr" checks should possibly have
 		 * separate masks.
 		 */
-		if ((rq->data_len & 15) || (addr & mask))
+		alignment = queue_dma_alignment(q) | q->dma_pad_mask;
+		if (addr & alignment || rq->data_len & alignment)
 			info->dma = 0;
 
 		if (!((addr & stack_mask) ^
@@ -1877,6 +1883,7 @@ static int ide_cdrom_setup(ide_drive_t *drive)
 
 	blk_queue_prep_rq(drive->queue, ide_cdrom_prep_fn);
 	blk_queue_dma_alignment(drive->queue, 31);
+	blk_queue_update_dma_pad(drive->queue, 15);
 	drive->queue->unplug_delay = (1 * HZ) / 1000;
 	if (!drive->queue->unplug_delay)
 		drive->queue->unplug_delay = 1;