dmaengine/dma_slave: introduce inline wrappers

Add inline wrappers for device_prep_slave_sg() and device_prep_dma_cyclic()
interfaces to hide new parameter from current users of affected interfaces.
Convert current users to use new wrappers instead of direct calls.
Suggested by Russell King [https://lkml.org/lkml/2012/2/3/269].

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

28 files changed, 67 insertions, 60 deletions

diff --git a/arch/arm/plat-nomadik/include/plat/ste_dma40.h b/arch/arm/plat-nomadik/include/plat/ste_dma40.h
index fd0ee84c45d1..9ff93b065686 100644
--- a/arch/arm/plat-nomadik/include/plat/ste_dma40.h
+++ b/arch/arm/plat-nomadik/include/plat/ste_dma40.h
@@ -200,8 +200,7 @@ dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan,
         sg.dma_address = addr;
         sg.length = size;
 
-        return chan->device->device_prep_slave_sg(chan, &sg, 1,
-                                                  direction, flags);
+        return dmaengine_prep_slave_sg(chan, &sg, 1, direction, flags);
 }
 
 #else
diff --git a/arch/arm/plat-samsung/dma-ops.c b/arch/arm/plat-samsung/dma-ops.c
index 0747c77a2fd5..a6ef3961134c 100644
--- a/arch/arm/plat-samsung/dma-ops.c
+++ b/arch/arm/plat-samsung/dma-ops.c
@@ -79,11 +79,11 @@ static int samsung_dmadev_prepare(unsigned ch,
                             info->len, offset_in_page(info->buf));
                 sg_dma_address(&sg) = info->buf;
 
-                desc = chan->device->device_prep_slave_sg(chan,
+                desc = dmaengine_prep_slave_sg(chan,
                         &sg, 1, info->direction, DMA_PREP_INTERRUPT);
                 break;
         case DMA_CYCLIC:
-                desc = chan->device->device_prep_dma_cyclic(chan,
+                desc = dmaengine_prep_dma_cyclic(chan,
                         info->buf, info->len, info->period, info->direction);
                 break;
         default:
diff --git a/drivers/media/video/mx3_camera.c b/drivers/media/video/mx3_camera.c
index 74522773e934..93c35ef5f0ad 100644
--- a/drivers/media/video/mx3_camera.c
+++ b/drivers/media/video/mx3_camera.c
@@ -286,7 +286,7 @@ static void mx3_videobuf_queue(struct vb2_buffer *vb)
                 sg_dma_address(sg)      = vb2_dma_contig_plane_dma_addr(vb, 0);
                 sg_dma_len(sg)          = new_size;
 
-                txd = ichan->dma_chan.device->device_prep_slave_sg(
+                txd = dmaengine_prep_slave_sg(
                         &ichan->dma_chan, sg, 1, DMA_DEV_TO_MEM,
                         DMA_PREP_INTERRUPT);
                 if (!txd)
diff --git a/drivers/media/video/timblogiw.c b/drivers/media/video/timblogiw.c
index 4ed1c7c28ae7..02194c056b00 100644
--- a/drivers/media/video/timblogiw.c
+++ b/drivers/media/video/timblogiw.c
@@ -564,7 +564,7 @@ static void buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 
         spin_unlock_irq(&fh->queue_lock);
 
-        desc = fh->chan->device->device_prep_slave_sg(fh->chan,
+        desc = dmaengine_prep_slave_sg(fh->chan,
                 buf->sg, sg_elems, DMA_DEV_TO_MEM,
                 DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
         if (!desc) {
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 3ba865ddebc4..492854b09d89 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -875,7 +875,7 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
                         data->sg_len, direction);
 
         dmaengine_slave_config(chan, &host->dma_conf);
-        desc = chan->device->device_prep_slave_sg(chan,
+        desc = dmaengine_prep_slave_sg(chan,
                         data->sg, sglen, slave_dirn,
                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         if (!desc)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index a09c06ba046c..c55f9663eb13 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -413,7 +413,7 @@ static int mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data,
                 return -EINVAL;
 
         dmaengine_slave_config(chan, &conf);
-        desc = device->device_prep_slave_sg(chan, data->sg, nr_sg,
+        desc = dmaengine_prep_slave_sg(chan, data->sg, nr_sg,
                                             conf.direction, DMA_CTRL_ACK);
         if (!desc)
                 goto unmap_exit;
diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c
index 68b69a91e5ef..b2058b432320 100644
--- a/drivers/mmc/host/mxcmmc.c
+++ b/drivers/mmc/host/mxcmmc.c
@@ -255,7 +255,7 @@ static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
         if (nents != data->sg_len)
                 return -EINVAL;
 
-        host->desc = host->dma->device->device_prep_slave_sg(host->dma,
+        host->desc = dmaengine_prep_slave_sg(host->dma,
                 data->sg, data->sg_len, slave_dirn,
                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 382c835d217c..65f36cf2ff33 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -324,7 +324,7 @@ static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
                 sg_len = SSP_PIO_NUM;
         }
 
-        desc = host->dmach->device->device_prep_slave_sg(host->dmach,
+        desc = dmaengine_prep_slave_sg(host->dmach,
                                 sgl, sg_len, host->slave_dirn, append);
         if (desc) {
                 desc->callback = mxs_mmc_dma_irq_callback;
diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index f5d8b53be333..3d00f1aab87d 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -285,7 +285,7 @@ static void sh_mmcif_start_dma_rx(struct sh_mmcif_host *host)
                          DMA_FROM_DEVICE);
         if (ret > 0) {
                 host->dma_active = true;
-                desc = chan->device->device_prep_slave_sg(chan, sg, ret,
+                desc = dmaengine_prep_slave_sg(chan, sg, ret,
                         DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         }
 
@@ -334,7 +334,7 @@ static void sh_mmcif_start_dma_tx(struct sh_mmcif_host *host)
                          DMA_TO_DEVICE);
         if (ret > 0) {
                 host->dma_active = true;
-                desc = chan->device->device_prep_slave_sg(chan, sg, ret,
+                desc = dmaengine_prep_slave_sg(chan, sg, ret,
                         DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         }
 
diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c
index 7a6e6cc8f8b8..def9c54f73f5 100644
--- a/drivers/mmc/host/tmio_mmc_dma.c
+++ b/drivers/mmc/host/tmio_mmc_dma.c
@@ -76,7 +76,7 @@ static void tmio_mmc_start_dma_rx(struct tmio_mmc_host *host)
 
         ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE);
         if (ret > 0)
-                desc = chan->device->device_prep_slave_sg(chan, sg, ret,
+                desc = dmaengine_prep_slave_sg(chan, sg, ret,
                         DMA_DEV_TO_MEM, DMA_CTRL_ACK);
 
         if (desc) {
@@ -157,7 +157,7 @@ static void tmio_mmc_start_dma_tx(struct tmio_mmc_host *host)
 
         ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
         if (ret > 0)
-                desc = chan->device->device_prep_slave_sg(chan, sg, ret,
+                desc = dmaengine_prep_slave_sg(chan, sg, ret,
                         DMA_MEM_TO_DEV, DMA_CTRL_ACK);
 
         if (desc) {
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
index 7f680420bfab..2a200ba0bd1a 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
@@ -825,7 +825,7 @@ int gpmi_send_command(struct gpmi_nand_data *this)
                 | BM_GPMI_CTRL0_ADDRESS_INCREMENT
                 | BF_GPMI_CTRL0_XFER_COUNT(this->command_length);
         pio[1] = pio[2] = 0;
-        desc = channel->device->device_prep_slave_sg(channel,
+        desc = dmaengine_prep_slave_sg(channel,
                                         (struct scatterlist *)pio,
                                         ARRAY_SIZE(pio), DMA_TRANS_NONE, 0);
         if (!desc) {
@@ -838,8 +838,7 @@ int gpmi_send_command(struct gpmi_nand_data *this)
 
         sg_init_one(sgl, this->cmd_buffer, this->command_length);
         dma_map_sg(this->dev, sgl, 1, DMA_TO_DEVICE);
-        desc = channel->device->device_prep_slave_sg(channel,
-                                        sgl, 1, DMA_MEM_TO_DEV, 1);
+        desc = dmaengine_prep_slave_sg(channel, sgl, 1, DMA_MEM_TO_DEV, 1);
         if (!desc) {
                 pr_err("step 2 error\n");
                 return -1;
@@ -870,8 +869,7 @@ int gpmi_send_data(struct gpmi_nand_data *this)
                 | BF_GPMI_CTRL0_ADDRESS(address)
                 | BF_GPMI_CTRL0_XFER_COUNT(this->upper_len);
         pio[1] = 0;
-        desc = channel->device->device_prep_slave_sg(channel,
-                                        (struct scatterlist *)pio,
+        desc = dmaengine_prep_slave_sg(channel, (struct scatterlist *)pio,
                                         ARRAY_SIZE(pio), DMA_TRANS_NONE, 0);
         if (!desc) {
                 pr_err("step 1 error\n");
@@ -880,7 +878,7 @@ int gpmi_send_data(struct gpmi_nand_data *this)
 
         /* [2] send DMA request */
         prepare_data_dma(this, DMA_TO_DEVICE);
-        desc = channel->device->device_prep_slave_sg(channel, &this->data_sgl,
+        desc = dmaengine_prep_slave_sg(channel, &this->data_sgl,
                                                 1, DMA_MEM_TO_DEV, 1);
         if (!desc) {
                 pr_err("step 2 error\n");
@@ -906,7 +904,7 @@ int gpmi_read_data(struct gpmi_nand_data *this)
                 | BF_GPMI_CTRL0_ADDRESS(BV_GPMI_CTRL0_ADDRESS__NAND_DATA)
                 | BF_GPMI_CTRL0_XFER_COUNT(this->upper_len);
         pio[1] = 0;
-        desc = channel->device->device_prep_slave_sg(channel,
+        desc = dmaengine_prep_slave_sg(channel,
                                         (struct scatterlist *)pio,
                                         ARRAY_SIZE(pio), DMA_TRANS_NONE, 0);
         if (!desc) {
@@ -916,8 +914,8 @@ int gpmi_read_data(struct gpmi_nand_data *this)
 
         /* [2] : send DMA request */
         prepare_data_dma(this, DMA_FROM_DEVICE);
-        desc = channel->device->device_prep_slave_sg(channel, &this->data_sgl,
-                                                1, DMA_DEV_TO_MEM, 1);
+        desc = dmaengine_prep_slave_sg(channel, &this->data_sgl,
+                                        1, DMA_DEV_TO_MEM, 1);
         if (!desc) {
                 pr_err("step 2 error\n");
                 return -1;
@@ -962,8 +960,7 @@ int gpmi_send_page(struct gpmi_nand_data *this,
         pio[4] = payload;
         pio[5] = auxiliary;
 
-        desc = channel->device->device_prep_slave_sg(channel,
-                                        (struct scatterlist *)pio,
+        desc = dmaengine_prep_slave_sg(channel, (struct scatterlist *)pio,
                                         ARRAY_SIZE(pio), DMA_TRANS_NONE, 0);
         if (!desc) {
                 pr_err("step 2 error\n");
@@ -997,7 +994,7 @@ int gpmi_read_page(struct gpmi_nand_data *this,
                 | BF_GPMI_CTRL0_ADDRESS(address)
                 | BF_GPMI_CTRL0_XFER_COUNT(0);
         pio[1] = 0;
-        desc = channel->device->device_prep_slave_sg(channel,
+        desc = dmaengine_prep_slave_sg(channel,
                                 (struct scatterlist *)pio, 2,
                                 DMA_TRANS_NONE, 0);
         if (!desc) {
@@ -1026,7 +1023,7 @@ int gpmi_read_page(struct gpmi_nand_data *this,
         pio[3] = geo->page_size;
         pio[4] = payload;
         pio[5] = auxiliary;
-        desc = channel->device->device_prep_slave_sg(channel,
+        desc = dmaengine_prep_slave_sg(channel,
                                         (struct scatterlist *)pio,
                                         ARRAY_SIZE(pio), DMA_TRANS_NONE, 1);
         if (!desc) {
@@ -1045,7 +1042,7 @@ int gpmi_read_page(struct gpmi_nand_data *this,
                 | BF_GPMI_CTRL0_ADDRESS(address)
                 | BF_GPMI_CTRL0_XFER_COUNT(geo->page_size);
         pio[1] = 0;
-        desc = channel->device->device_prep_slave_sg(channel,
+        desc = dmaengine_prep_slave_sg(channel,
                                 (struct scatterlist *)pio, 2,
                                 DMA_TRANS_NONE, 1);
         if (!desc) {
diff --git a/drivers/net/ethernet/micrel/ks8842.c b/drivers/net/ethernet/micrel/ks8842.c
index 0a85690a1321..554fef3f0130 100644
--- a/drivers/net/ethernet/micrel/ks8842.c
+++ b/drivers/net/ethernet/micrel/ks8842.c
@@ -458,7 +458,7 @@ static int ks8842_tx_frame_dma(struct sk_buff *skb, struct net_device *netdev)
         if (sg_dma_len(&ctl->sg) % 4)
                 sg_dma_len(&ctl->sg) += 4 - sg_dma_len(&ctl->sg) % 4;
 
-        ctl->adesc = ctl->chan->device->device_prep_slave_sg(ctl->chan,
+        ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
                 &ctl->sg, 1, DMA_MEM_TO_DEV,
                 DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
         if (!ctl->adesc)
@@ -570,7 +570,7 @@ static int __ks8842_start_new_rx_dma(struct net_device *netdev)
 
                 sg_dma_len(sg) = DMA_BUFFER_SIZE;
 
-                ctl->adesc = ctl->chan->device->device_prep_slave_sg(ctl->chan,
+                ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
                         sg, 1, DMA_DEV_TO_MEM,
                         DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
 
diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c
index 04d6c1b31383..b9f0192758d6 100644
--- a/drivers/spi/spi-dw-mid.c
+++ b/drivers/spi/spi-dw-mid.c
@@ -146,7 +146,7 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
         dws->tx_sgl.dma_address = dws->tx_dma;
         dws->tx_sgl.length = dws->len;
 
-        txdesc = txchan->device->device_prep_slave_sg(txchan,
+        txdesc = dmaengine_prep_slave_sg(txchan,
                                 &dws->tx_sgl,
                                 1,
                                 DMA_MEM_TO_DEV,
@@ -169,7 +169,7 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
         dws->rx_sgl.dma_address = dws->rx_dma;
         dws->rx_sgl.length = dws->len;
 
-        rxdesc = rxchan->device->device_prep_slave_sg(rxchan,
+        rxdesc = dmaengine_prep_slave_sg(rxchan,
                                 &dws->rx_sgl,
                                 1,
                                 DMA_DEV_TO_MEM,
diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
index d46e55c720b7..6db2887852d6 100644
--- a/drivers/spi/spi-ep93xx.c
+++ b/drivers/spi/spi-ep93xx.c
@@ -633,8 +633,8 @@ ep93xx_spi_dma_prepare(struct ep93xx_spi *espi, enum dma_data_direction dir)
         if (!nents)
                 return ERR_PTR(-ENOMEM);
 
-        txd = chan->device->device_prep_slave_sg(chan, sgt->sgl, nents,
-                                                 slave_dirn, DMA_CTRL_ACK);
+        txd = dmaengine_prep_slave_sg(chan, sgt->sgl, nents,
+                                        slave_dirn, DMA_CTRL_ACK);
         if (!txd) {
                 dma_unmap_sg(chan->device->dev, sgt->sgl, sgt->nents, dir);
                 return ERR_PTR(-ENOMEM);
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 1dc667f8a305..a209f3b7b05b 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -1040,7 +1040,7 @@ static int configure_dma(struct pl022 *pl022)
                 goto err_tx_sgmap;
 
         /* Send both scatterlists */
-        rxdesc = rxchan->device->device_prep_slave_sg(rxchan,
+        rxdesc = dmaengine_prep_slave_sg(rxchan,
                                       pl022->sgt_rx.sgl,
                                       rx_sglen,
                                       DMA_DEV_TO_MEM,
@@ -1048,7 +1048,7 @@ static int configure_dma(struct pl022 *pl022)
         if (!rxdesc)
                 goto err_rxdesc;
 
-        txdesc = txchan->device->device_prep_slave_sg(txchan,
+        txdesc = dmaengine_prep_slave_sg(txchan,
                                       pl022->sgt_tx.sgl,
                                       tx_sglen,
                                       DMA_MEM_TO_DEV,
diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c
index 2a6429d8c363..ea4c8d57667a 100644
--- a/drivers/spi/spi-topcliff-pch.c
+++ b/drivers/spi/spi-topcliff-pch.c
@@ -1078,7 +1078,7 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
                 sg_dma_address(sg) = dma->rx_buf_dma + sg->offset;
         }
         sg = dma->sg_rx_p;
-        desc_rx = dma->chan_rx->device->device_prep_slave_sg(dma->chan_rx, sg,
+        desc_rx = dmaengine_prep_slave_sg(dma->chan_rx, sg,
                                         num, DMA_DEV_TO_MEM,
                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         if (!desc_rx) {
@@ -1123,7 +1123,7 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
                 sg_dma_address(sg) = dma->tx_buf_dma + sg->offset;
         }
         sg = dma->sg_tx_p;
-        desc_tx = dma->chan_tx->device->device_prep_slave_sg(dma->chan_tx,
+        desc_tx = dmaengine_prep_slave_sg(dma->chan_tx,
                                         sg, num, DMA_MEM_TO_DEV,
                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         if (!desc_tx) {
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index db7f88a1bdee..f9dcb5379b92 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -483,7 +483,7 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap)
                 return -EBUSY;
         }
 
-        desc = dma_dev->device_prep_slave_sg(chan, &dmatx->sg, 1, DMA_MEM_TO_DEV,
+        desc = dmaengine_prep_slave_sg(chan, &dmatx->sg, 1, DMA_MEM_TO_DEV,
                                              DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         if (!desc) {
                 dma_unmap_sg(dma_dev->dev, &dmatx->sg, 1, DMA_TO_DEVICE);
@@ -666,7 +666,6 @@ static void pl011_dma_rx_callback(void *data);
 static int pl011_dma_rx_trigger_dma(struct uart_amba_port *uap)
 {
         struct dma_chan *rxchan = uap->dmarx.chan;
-        struct dma_device *dma_dev;
         struct pl011_dmarx_data *dmarx = &uap->dmarx;
         struct dma_async_tx_descriptor *desc;
         struct pl011_sgbuf *sgbuf;
@@ -677,8 +676,7 @@ static int pl011_dma_rx_trigger_dma(struct uart_amba_port *uap)
         /* Start the RX DMA job */
         sgbuf = uap->dmarx.use_buf_b ?
                 &uap->dmarx.sgbuf_b : &uap->dmarx.sgbuf_a;
-        dma_dev = rxchan->device;
-        desc = rxchan->device->device_prep_slave_sg(rxchan, &sgbuf->sg, 1,
+        desc = dmaengine_prep_slave_sg(rxchan, &sgbuf->sg, 1,
                                         DMA_DEV_TO_MEM,
                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         /*
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 17ae65762d1a..61743bdc439b 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -763,7 +763,7 @@ static int dma_handle_rx(struct eg20t_port *priv)
 
         sg_dma_address(sg) = priv->rx_buf_dma;
 
-        desc = priv->chan_rx->device->device_prep_slave_sg(priv->chan_rx,
+        desc = dmaengine_prep_slave_sg(priv->chan_rx,
                         sg, 1, DMA_DEV_TO_MEM,
                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 
@@ -922,7 +922,7 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
                         sg_dma_len(sg) = size;
         }
 
-        desc = priv->chan_tx->device->device_prep_slave_sg(priv->chan_tx,
+        desc = dmaengine_prep_slave_sg(priv->chan_tx,
                                         priv->sg_tx_p, nent, DMA_MEM_TO_DEV,
                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         if (!desc) {
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 75085795528e..872557f89cca 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1338,7 +1338,7 @@ static void sci_submit_rx(struct sci_port *s)
                 struct scatterlist *sg = &s->sg_rx[i];
                 struct dma_async_tx_descriptor *desc;
 
-                desc = chan->device->device_prep_slave_sg(chan,
+                desc = dmaengine_prep_slave_sg(chan,
                         sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
 
                 if (desc) {
@@ -1453,7 +1453,7 @@ static void work_fn_tx(struct work_struct *work)
 
         BUG_ON(!sg_dma_len(sg));
 
-        desc = chan->device->device_prep_slave_sg(chan,
+        desc = dmaengine_prep_slave_sg(chan,
                         sg, s->sg_len_tx, DMA_MEM_TO_DEV,
                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         if (!desc) {
diff --git a/drivers/usb/musb/ux500_dma.c b/drivers/usb/musb/ux500_dma.c
index 2a36bf37d7aa..d05c7fbbb703 100644
--- a/drivers/usb/musb/ux500_dma.c
+++ b/drivers/usb/musb/ux500_dma.c
@@ -120,8 +120,7 @@ static bool ux500_configure_channel(struct dma_channel *channel,
         dma_chan->device->device_control(dma_chan, DMA_SLAVE_CONFIG,
                                              (unsigned long) &slave_conf);
 
-        dma_desc = dma_chan->device->
-                        device_prep_slave_sg(dma_chan, &sg, 1, direction,
+        dma_desc = dmaengine_prep_slave_sg(dma_chan, &sg, 1, direction,
                                              DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         if (!dma_desc)
                 return false;
diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 72339bd6fcab..7b4309339f3d 100644
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -783,9 +783,8 @@ static void usbhsf_dma_prepare_tasklet(unsigned long data)
         sg_dma_address(&sg) = pkt->dma + pkt->actual;
         sg_dma_len(&sg) = pkt->trans;
 
-        desc = chan->device->device_prep_slave_sg(chan, &sg, 1, dir,
-                                                  DMA_PREP_INTERRUPT |
-                                                  DMA_CTRL_ACK);
+        desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir,
+                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         if (!desc)
                 return;
 
diff --git a/drivers/video/mx3fb.c b/drivers/video/mx3fb.c
index 727a5149d818..eec0d7b748eb 100644
--- a/drivers/video/mx3fb.c
+++ b/drivers/video/mx3fb.c
@@ -337,7 +337,7 @@ static void sdc_enable_channel(struct mx3fb_info *mx3_fbi)
 
         /* This enables the channel */
         if (mx3_fbi->cookie < 0) {
-                mx3_fbi->txd = dma_chan->device->device_prep_slave_sg(dma_chan,
+                mx3_fbi->txd = dmaengine_prep_slave_sg(dma_chan,
                       &mx3_fbi->sg[0], 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
                 if (!mx3_fbi->txd) {
                         dev_err(mx3fb->dev, "Cannot allocate descriptor on %d\n",
@@ -1091,7 +1091,7 @@ static int mx3fb_pan_display(struct fb_var_screeninfo *var,
         if (mx3_fbi->txd)
                 async_tx_ack(mx3_fbi->txd);
 
-        txd = dma_chan->device->device_prep_slave_sg(dma_chan, sg +
+        txd = dmaengine_prep_slave_sg(dma_chan, sg +
                 mx3_fbi->cur_ipu_buf, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
         if (!txd) {
                 dev_err(fbi->device,
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 715babf4bffe..03d68b7e5705 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -622,6 +622,22 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(
         return chan->device->device_prep_slave_sg(chan, &sg, 1, dir, flags);
 }
 
+static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_sg(
+        struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
+        enum dma_transfer_direction dir, unsigned long flags)
+{
+        return chan->device->device_prep_slave_sg(chan, sgl, sg_len,
+                                                  dir, flags);
+}
+
+static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_cyclic(
+                struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
+                size_t period_len, enum dma_transfer_direction dir)
+{
+        return chan->device->device_prep_dma_cyclic(chan, buf_addr, buf_len,
+                                                        period_len, dir);
+}
+
 static inline int dmaengine_terminate_all(struct dma_chan *chan)
 {
         return dmaengine_device_control(chan, DMA_TERMINATE_ALL, 0);
diff --git a/sound/soc/ep93xx/ep93xx-pcm.c b/sound/soc/ep93xx/ep93xx-pcm.c
index de8390449873..50593e50ad57 100644
--- a/sound/soc/ep93xx/ep93xx-pcm.c
+++ b/sound/soc/ep93xx/ep93xx-pcm.c
@@ -142,11 +142,10 @@ static int ep93xx_pcm_dma_submit(struct snd_pcm_substream *substream)
         struct snd_pcm_runtime *runtime = substream->runtime;
         struct ep93xx_runtime_data *rtd = runtime->private_data;
         struct dma_chan *chan = rtd->dma_chan;
-        struct dma_device *dma_dev = chan->device;
         struct dma_async_tx_descriptor *desc;
 
         rtd->pointer_bytes = 0;
-        desc = dma_dev->device_prep_dma_cyclic(chan, runtime->dma_addr,
+        desc = dmaengine_prep_dma_cyclic(chan, runtime->dma_addr,
                                                rtd->period_bytes * rtd->periods,
                                                rtd->period_bytes,
                                                rtd->dma_data.direction);
diff --git a/sound/soc/imx/imx-pcm-dma-mx2.c b/sound/soc/imx/imx-pcm-dma-mx2.c
index 52b0dedbf996..af46b4e2b438 100644
--- a/sound/soc/imx/imx-pcm-dma-mx2.c
+++ b/sound/soc/imx/imx-pcm-dma-mx2.c
@@ -160,7 +160,7 @@ static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
 
         iprtd->buf = (unsigned int *)substream->dma_buffer.area;
 
-        iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
+        iprtd->desc = dmaengine_prep_dma_cyclic(chan, dma_addr,
                         iprtd->period_bytes * iprtd->periods,
                         iprtd->period_bytes,
                         substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
diff --git a/sound/soc/mxs/mxs-pcm.c b/sound/soc/mxs/mxs-pcm.c
index 105f42a394df..661b678d08a8 100644
--- a/sound/soc/mxs/mxs-pcm.c
+++ b/sound/soc/mxs/mxs-pcm.c
@@ -132,7 +132,7 @@ static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
 
         iprtd->buf = substream->dma_buffer.area;
 
-        iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
+        iprtd->desc = dmaengine_prep_dma_cyclic(chan, dma_addr,
                         iprtd->period_bytes * iprtd->periods,
                         iprtd->period_bytes,
                         substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
diff --git a/sound/soc/sh/siu_pcm.c b/sound/soc/sh/siu_pcm.c
index 0193e595d415..5cfcc655e95f 100644
--- a/sound/soc/sh/siu_pcm.c
+++ b/sound/soc/sh/siu_pcm.c
@@ -130,7 +130,7 @@ static int siu_pcm_wr_set(struct siu_port *port_info,
         sg_dma_len(&sg) = size;
         sg_dma_address(&sg) = buff;
 
-        desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
+        desc = dmaengine_prep_slave_sg(siu_stream->chan,
                 &sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         if (!desc) {
                 dev_err(dev, "Failed to allocate a dma descriptor\n");
@@ -180,7 +180,7 @@ static int siu_pcm_rd_set(struct siu_port *port_info,
         sg_dma_len(&sg) = size;
         sg_dma_address(&sg) = buff;
 
-        desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
+        desc = dmaengine_prep_slave_sg(siu_stream->chan,
                 &sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
         if (!desc) {
                 dev_err(dev, "Failed to allocate dma descriptor\n");
diff --git a/sound/soc/txx9/txx9aclc.c b/sound/soc/txx9/txx9aclc.c
index 21554611557c..b609d2c64c55 100644
--- a/sound/soc/txx9/txx9aclc.c
+++ b/sound/soc/txx9/txx9aclc.c
@@ -132,7 +132,7 @@ txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
                     dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
         sg_dma_address(&sg) = buf_dma_addr;
-        desc = chan->device->device_prep_slave_sg(chan, &sg, 1,
+        desc = dmaengine_prep_slave_sg(chan, &sg, 1,
                 dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
                 DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);