ide: use the dma safe check for REQ_TYPE_ATA_PC

This uses the dma safe check for REQ_TYPE_ATA_PC. The dma safe check
is used for only sg requests but it should be used for other non fs
commands.

This uses blk_queue_update_dma_pad to make the intention clear though
ide don't use the blk APIs so it doesn't change anything.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Borislav Petkov <petkovbb@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Tejun Heo <htejun@gmail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index d6667c3..e12d602 100644 (file)
--- a/drivers/ide/ide-cd.c
+++ b/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;