Re: [PATCH v2 13/13] dmaengine: remove DMA unmap flags

From: Jon Mason
Date: Tue Oct 22 2013 - 19:07:22 EST

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In reply to: Dan Williams: "[PATCH v2 13/13] dmaengine: remove DMA unmap flags"
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On Tue, Oct 22, 2013 at 02:08:34PM -0700, Dan Williams wrote:
> From: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
>
> Remove no longer needed DMA unmap flags:
> - DMA_COMPL_SKIP_SRC_UNMAP
> - DMA_COMPL_SKIP_DEST_UNMAP
> - DMA_COMPL_SRC_UNMAP_SINGLE
> - DMA_COMPL_DEST_UNMAP_SINGLE
>
> Cc: Viresh Kumar <viresh.linux@xxxxxxxxx>
> Cc: Tejun Heo <tj@xxxxxxxxxx>
> Cc: Vinod Koul <vinod.koul@xxxxxxxxx>
> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
> Cc: Jon Mason <jon.mason@xxxxxxxxx>

For NTB relevant parts
Acked-by: Jon Mason <jon.mason@xxxxxxxxx>

> Cc: Mark Brown <broonie@xxxxxxxxxx>
> Cc: Tomasz Figa <t.figa@xxxxxxxxxxx>
> Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---
>
> Resend to:
> 1/ add it to the new dmaengine patchwork
> 2/ cc maintainers of affected drivers
> 3/ fixup some mail addresses
>
> crypto/async_tx/async_memcpy.c | 3 +--
> crypto/async_tx/async_pq.c | 1 -
> crypto/async_tx/async_raid6_recov.c | 8 ++------
> crypto/async_tx/async_xor.c | 6 ++----
> drivers/ata/pata_arasan_cf.c | 3 +--
> drivers/dma/dmaengine.c | 3 +--
> drivers/dma/dmatest.c | 3 +--
> drivers/dma/ioat/dma.c | 3 +--
> drivers/dma/ioat/dma_v3.c | 12 +++---------
> drivers/media/platform/m2m-deinterlace.c | 3 +--
> drivers/media/platform/timblogiw.c | 2 +-
> drivers/misc/carma/carma-fpga.c | 3 +--
> drivers/mtd/nand/atmel_nand.c | 3 +--
> drivers/mtd/nand/fsmc_nand.c | 2 --
> drivers/net/ethernet/micrel/ks8842.c | 6 ++----
> drivers/ntb/ntb_transport.c | 3 +--
> drivers/spi/spi-dw-mid.c | 4 ++--
> include/linux/dmaengine.h | 18 ++++--------------
> 18 files changed, 25 insertions(+), 61 deletions(-)
>
> diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c
> index 72750214f779..f8c0b8dbeb75 100644
> --- a/crypto/async_tx/async_memcpy.c
> +++ b/crypto/async_tx/async_memcpy.c
> @@ -56,8 +56,7 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
> unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOIO);
>
> if (unmap && is_dma_copy_aligned(device, src_offset, dest_offset, len)) {
> - unsigned long dma_prep_flags = DMA_COMPL_SKIP_SRC_UNMAP |
> - DMA_COMPL_SKIP_DEST_UNMAP;
> + unsigned long dma_prep_flags = 0;
>
> if (submit->cb_fn)
> dma_prep_flags |= DMA_PREP_INTERRUPT;
> diff --git a/crypto/async_tx/async_pq.c b/crypto/async_tx/async_pq.c
> index 4126b56fbc01..d05327caf69d 100644
> --- a/crypto/async_tx/async_pq.c
> +++ b/crypto/async_tx/async_pq.c
> @@ -62,7 +62,6 @@ do_async_gen_syndrome(struct dma_chan *chan,
> dma_addr_t dma_dest[2];
> int src_off = 0;
>
> - dma_flags |= DMA_COMPL_SKIP_SRC_UNMAP | DMA_COMPL_SKIP_DEST_UNMAP;
> if (submit->flags & ASYNC_TX_FENCE)
> dma_flags |= DMA_PREP_FENCE;
>
> diff --git a/crypto/async_tx/async_raid6_recov.c b/crypto/async_tx/async_raid6_recov.c
> index a3a72a784421..934a84981495 100644
> --- a/crypto/async_tx/async_raid6_recov.c
> +++ b/crypto/async_tx/async_raid6_recov.c
> @@ -47,9 +47,7 @@ async_sum_product(struct page *dest, struct page **srcs, unsigned char *coef,
> struct device *dev = dma->dev;
> dma_addr_t pq[2];
> struct dma_async_tx_descriptor *tx;
> - enum dma_ctrl_flags dma_flags = DMA_COMPL_SKIP_SRC_UNMAP |
> - DMA_COMPL_SKIP_DEST_UNMAP |
> - DMA_PREP_PQ_DISABLE_P;
> + enum dma_ctrl_flags dma_flags = DMA_PREP_PQ_DISABLE_P;
>
> if (submit->flags & ASYNC_TX_FENCE)
> dma_flags |= DMA_PREP_FENCE;
> @@ -113,9 +111,7 @@ async_mult(struct page *dest, struct page *src, u8 coef, size_t len,
> dma_addr_t dma_dest[2];
> struct device *dev = dma->dev;
> struct dma_async_tx_descriptor *tx;
> - enum dma_ctrl_flags dma_flags = DMA_COMPL_SKIP_SRC_UNMAP |
> - DMA_COMPL_SKIP_DEST_UNMAP |
> - DMA_PREP_PQ_DISABLE_P;
> + enum dma_ctrl_flags dma_flags = DMA_PREP_PQ_DISABLE_P;
>
> if (submit->flags & ASYNC_TX_FENCE)
> dma_flags |= DMA_PREP_FENCE;
> diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
> index d2cc77d501c7..3c562f5a60bb 100644
> --- a/crypto/async_tx/async_xor.c
> +++ b/crypto/async_tx/async_xor.c
> @@ -41,7 +41,7 @@ do_async_xor(struct dma_chan *chan, struct dmaengine_unmap_data *unmap,
> dma_async_tx_callback cb_fn_orig = submit->cb_fn;
> void *cb_param_orig = submit->cb_param;
> enum async_tx_flags flags_orig = submit->flags;
> - enum dma_ctrl_flags dma_flags;
> + enum dma_ctrl_flags dma_flags = 0;
> int src_cnt = unmap->to_cnt;
> int xor_src_cnt;
> dma_addr_t dma_dest = unmap->addr[unmap->to_cnt];
> @@ -55,7 +55,6 @@ do_async_xor(struct dma_chan *chan, struct dmaengine_unmap_data *unmap,
> /* if we are submitting additional xors, leave the chain open
> * and clear the callback parameters
> */
> - dma_flags = DMA_COMPL_SKIP_SRC_UNMAP | DMA_COMPL_SKIP_DEST_UNMAP;
> if (src_cnt > xor_src_cnt) {
> submit->flags &= ~ASYNC_TX_ACK;
> submit->flags |= ASYNC_TX_FENCE;
> @@ -284,8 +283,7 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
>
> if (unmap && src_cnt <= device->max_xor &&
> is_dma_xor_aligned(device, offset, 0, len)) {
> - unsigned long dma_prep_flags = DMA_COMPL_SKIP_SRC_UNMAP |
> - DMA_COMPL_SKIP_DEST_UNMAP;
> + unsigned long dma_prep_flags = 0;
> int i;
>
> pr_debug("%s: (async) len: %zu\n", __func__, len);
> diff --git a/drivers/ata/pata_arasan_cf.c b/drivers/ata/pata_arasan_cf.c
> index 853f610af28f..e88690ebfd82 100644
> --- a/drivers/ata/pata_arasan_cf.c
> +++ b/drivers/ata/pata_arasan_cf.c
> @@ -396,8 +396,7 @@ dma_xfer(struct arasan_cf_dev *acdev, dma_addr_t src, dma_addr_t dest, u32 len)
> struct dma_async_tx_descriptor *tx;
> struct dma_chan *chan = acdev->dma_chan;
> dma_cookie_t cookie;
> - unsigned long flags = DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP |
> - DMA_COMPL_SKIP_DEST_UNMAP;
> + unsigned long flags = DMA_PREP_INTERRUPT;
> int ret = 0;
>
> tx = chan->device->device_prep_dma_memcpy(chan, dest, src, len, flags);
> diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
> index f878c808466e..b69ac3892b86 100644
> --- a/drivers/dma/dmaengine.c
> +++ b/drivers/dma/dmaengine.c
> @@ -1065,8 +1065,7 @@ dma_async_memcpy_pg_to_pg(struct dma_chan *chan, struct page *dest_pg,
> unmap->addr[1] = dma_map_page(dev->dev, dest_pg, dest_off, len,
> DMA_FROM_DEVICE);
> unmap->len = len;
> - flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_SRC_UNMAP |
> - DMA_COMPL_SKIP_DEST_UNMAP;
> + flags = DMA_CTRL_ACK;
> tx = dev->device_prep_dma_memcpy(chan, unmap->addr[1], unmap->addr[0],
> len, flags);
>
> diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
> index f4a2a25fae31..5791091c13ca 100644
> --- a/drivers/dma/dmatest.c
> +++ b/drivers/dma/dmatest.c
> @@ -599,8 +599,7 @@ static int dmatest_func(void *data)
> /*
> * src and dst buffers are freed by ourselves below
> */
> - flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT |
> - DMA_COMPL_SKIP_SRC_UNMAP | DMA_COMPL_SKIP_DEST_UNMAP;
> + flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
>
> while (!kthread_should_stop()
> && !(params->iterations && total_tests >= params->iterations)) {
> diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
> index c123e32dbbb0..6fcf741ad91b 100644
> --- a/drivers/dma/ioat/dma.c
> +++ b/drivers/dma/ioat/dma.c
> @@ -818,8 +818,7 @@ int ioat_dma_self_test(struct ioatdma_device *device)
>
> dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
> dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
> - flags = DMA_COMPL_SKIP_SRC_UNMAP | DMA_COMPL_SKIP_DEST_UNMAP |
> - DMA_PREP_INTERRUPT;
> + flags = DMA_PREP_INTERRUPT;
> tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src,
> IOAT_TEST_SIZE, flags);
> if (!tx) {
> diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
> index 43386c171bba..a4798f0cc225 100644
> --- a/drivers/dma/ioat/dma_v3.c
> +++ b/drivers/dma/ioat/dma_v3.c
> @@ -1279,9 +1279,7 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device)
> DMA_TO_DEVICE);
> tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
> IOAT_NUM_SRC_TEST, PAGE_SIZE,
> - DMA_PREP_INTERRUPT |
> - DMA_COMPL_SKIP_SRC_UNMAP |
> - DMA_COMPL_SKIP_DEST_UNMAP);
> + DMA_PREP_INTERRUPT);
>
> if (!tx) {
> dev_err(dev, "Self-test xor prep failed\n");
> @@ -1342,9 +1340,7 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device)
> DMA_TO_DEVICE);
> tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
> IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
> - &xor_val_result, DMA_PREP_INTERRUPT |
> - DMA_COMPL_SKIP_SRC_UNMAP |
> - DMA_COMPL_SKIP_DEST_UNMAP);
> + &xor_val_result, DMA_PREP_INTERRUPT);
> if (!tx) {
> dev_err(dev, "Self-test zero prep failed\n");
> err = -ENODEV;
> @@ -1389,9 +1385,7 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device)
> DMA_TO_DEVICE);
> tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
> IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
> - &xor_val_result, DMA_PREP_INTERRUPT |
> - DMA_COMPL_SKIP_SRC_UNMAP |
> - DMA_COMPL_SKIP_DEST_UNMAP);
> + &xor_val_result, DMA_PREP_INTERRUPT);
> if (!tx) {
> dev_err(dev, "Self-test 2nd zero prep failed\n");
> err = -ENODEV;
> diff --git a/drivers/media/platform/m2m-deinterlace.c b/drivers/media/platform/m2m-deinterlace.c
> index 540516ca872c..879ea6fdd1be 100644
> --- a/drivers/media/platform/m2m-deinterlace.c
> +++ b/drivers/media/platform/m2m-deinterlace.c
> @@ -341,8 +341,7 @@ static void deinterlace_issue_dma(struct deinterlace_ctx *ctx, int op,
> ctx->xt->dir = DMA_MEM_TO_MEM;
> ctx->xt->src_sgl = false;
> ctx->xt->dst_sgl = true;
> - flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT |
> - DMA_COMPL_SKIP_DEST_UNMAP | DMA_COMPL_SKIP_SRC_UNMAP;
> + flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
>
> tx = dmadev->device_prep_interleaved_dma(chan, ctx->xt, flags);
> if (tx == NULL) {
> diff --git a/drivers/media/platform/timblogiw.c b/drivers/media/platform/timblogiw.c
> index b557caf5b1a4..59a95e3ab0e3 100644
> --- a/drivers/media/platform/timblogiw.c
> +++ b/drivers/media/platform/timblogiw.c
> @@ -565,7 +565,7 @@ static void buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
>
> desc = dmaengine_prep_slave_sg(fh->chan,
> buf->sg, sg_elems, DMA_DEV_TO_MEM,
> - DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
> + DMA_PREP_INTERRUPT);
> if (!desc) {
> spin_lock_irq(&fh->queue_lock);
> list_del_init(&vb->queue);
> diff --git a/drivers/misc/carma/carma-fpga.c b/drivers/misc/carma/carma-fpga.c
> index 7b56563f8b74..5335104e7c84 100644
> --- a/drivers/misc/carma/carma-fpga.c
> +++ b/drivers/misc/carma/carma-fpga.c
> @@ -631,8 +631,7 @@ static int data_submit_dma(struct fpga_device *priv, struct data_buf *buf)
> struct dma_async_tx_descriptor *tx;
> dma_cookie_t cookie;
> dma_addr_t dst, src;
> - unsigned long dma_flags = DMA_COMPL_SKIP_DEST_UNMAP |
> - DMA_COMPL_SKIP_SRC_UNMAP;
> + unsigned long dma_flags = 0;
>
> dst_sg = buf->vb.sglist;
> dst_nents = buf->vb.sglen;
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 060feeaf6b3e..2a837cb425d7 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -375,8 +375,7 @@ static int atmel_nand_dma_op(struct mtd_info *mtd, void *buf, int len,
>
> dma_dev = host->dma_chan->device;
>
> - flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP |
> - DMA_COMPL_SKIP_DEST_UNMAP;
> + flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
>
> phys_addr = dma_map_single(dma_dev->dev, p, len, dir);
> if (dma_mapping_error(dma_dev->dev, phys_addr)) {
> diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
> index 3dc1a7564d87..8b2752263db9 100644
> --- a/drivers/mtd/nand/fsmc_nand.c
> +++ b/drivers/mtd/nand/fsmc_nand.c
> @@ -573,8 +573,6 @@ static int dma_xfer(struct fsmc_nand_data *host, void *buffer, int len,
> dma_dev = chan->device;
> dma_addr = dma_map_single(dma_dev->dev, buffer, len, direction);
>
> - flags |= DMA_COMPL_SKIP_SRC_UNMAP | DMA_COMPL_SKIP_DEST_UNMAP;
> -
> if (direction == DMA_TO_DEVICE) {
> dma_src = dma_addr;
> dma_dst = host->data_pa;
> diff --git a/drivers/net/ethernet/micrel/ks8842.c b/drivers/net/ethernet/micrel/ks8842.c
> index 0951f7aca1ef..822616e3c375 100644
> --- a/drivers/net/ethernet/micrel/ks8842.c
> +++ b/drivers/net/ethernet/micrel/ks8842.c
> @@ -459,8 +459,7 @@ static int ks8842_tx_frame_dma(struct sk_buff *skb, struct net_device *netdev)
> sg_dma_len(&ctl->sg) += 4 - sg_dma_len(&ctl->sg) % 4;
>
> ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
> - &ctl->sg, 1, DMA_MEM_TO_DEV,
> - DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
> + &ctl->sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
> if (!ctl->adesc)
> return NETDEV_TX_BUSY;
>
> @@ -571,8 +570,7 @@ static int __ks8842_start_new_rx_dma(struct net_device *netdev)
> sg_dma_len(sg) = DMA_BUFFER_SIZE;
>
> ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
> - sg, 1, DMA_DEV_TO_MEM,
> - DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
> + sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
>
> if (!ctl->adesc)
> goto out;
> diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
> index fc6bbf1e16d9..bc7a55cdf679 100644
> --- a/drivers/ntb/ntb_transport.c
> +++ b/drivers/ntb/ntb_transport.c
> @@ -1072,8 +1072,7 @@ static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset,
>
> unmap->from_cnt = 1;
>
> - flags = DMA_COMPL_SKIP_SRC_UNMAP | DMA_COMPL_SKIP_DEST_UNMAP |
> - DMA_PREP_INTERRUPT;
> + flags = DMA_PREP_INTERRUPT;
> txd = device->device_prep_dma_memcpy(chan, unmap->addr[1],
> unmap->addr[0], len, flags);
> if (!txd)
> diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c
> index b9f0192758d6..6d207afec8cb 100644
> --- a/drivers/spi/spi-dw-mid.c
> +++ b/drivers/spi/spi-dw-mid.c
> @@ -150,7 +150,7 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
> &dws->tx_sgl,
> 1,
> DMA_MEM_TO_DEV,
> - DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_DEST_UNMAP);
> + DMA_PREP_INTERRUPT);
> txdesc->callback = dw_spi_dma_done;
> txdesc->callback_param = dws;
>
> @@ -173,7 +173,7 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
> &dws->rx_sgl,
> 1,
> DMA_DEV_TO_MEM,
> - DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_DEST_UNMAP);
> + DMA_PREP_INTERRUPT);
> rxdesc->callback = dw_spi_dma_done;
> rxdesc->callback_param = dws;
>
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index 3782cdb782a8..491072cb5ba0 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -171,12 +171,6 @@ struct dma_interleaved_template {
> * @DMA_CTRL_ACK - if clear, the descriptor cannot be reused until the client
> * acknowledges receipt, i.e. has has a chance to establish any dependency
> * chains
> - * @DMA_COMPL_SKIP_SRC_UNMAP - set to disable dma-unmapping the source buffer(s)
> - * @DMA_COMPL_SKIP_DEST_UNMAP - set to disable dma-unmapping the destination(s)
> - * @DMA_COMPL_SRC_UNMAP_SINGLE - set to do the source dma-unmapping as single
> - * (if not set, do the source dma-unmapping as page)
> - * @DMA_COMPL_DEST_UNMAP_SINGLE - set to do the destination dma-unmapping as single
> - * (if not set, do the destination dma-unmapping as page)
> * @DMA_PREP_PQ_DISABLE_P - prevent generation of P while generating Q
> * @DMA_PREP_PQ_DISABLE_Q - prevent generation of Q while generating P
> * @DMA_PREP_CONTINUE - indicate to a driver that it is reusing buffers as
> @@ -188,14 +182,10 @@ struct dma_interleaved_template {
> enum dma_ctrl_flags {
> DMA_PREP_INTERRUPT = (1 << 0),
> DMA_CTRL_ACK = (1 << 1),
> - DMA_COMPL_SKIP_SRC_UNMAP = (1 << 2),
> - DMA_COMPL_SKIP_DEST_UNMAP = (1 << 3),
> - DMA_COMPL_SRC_UNMAP_SINGLE = (1 << 4),
> - DMA_COMPL_DEST_UNMAP_SINGLE = (1 << 5),
> - DMA_PREP_PQ_DISABLE_P = (1 << 6),
> - DMA_PREP_PQ_DISABLE_Q = (1 << 7),
> - DMA_PREP_CONTINUE = (1 << 8),
> - DMA_PREP_FENCE = (1 << 9),
> + DMA_PREP_PQ_DISABLE_P = (1 << 2),
> + DMA_PREP_PQ_DISABLE_Q = (1 << 3),
> + DMA_PREP_CONTINUE = (1 << 4),
> + DMA_PREP_FENCE = (1 << 5),
> };
>
> /**
>
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Next message: John Stultz: "[GIT PULL] tip/timers/core: Hopefully last few timekeeping changesfor 3.13"
Previous message: David Cohen: "Re: [PATCH 2/2] mrst_max3110: fix SPI UART interrupt parameters"
In reply to: Dan Williams: "[PATCH v2 13/13] dmaengine: remove DMA unmap flags"
Next in thread: Bartlomiej Zolnierkiewicz: "[PATCH v2 09/13] async_pq: convert to dmaengine_unmap_data"
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