drivers/dma: remove unused support for MEMSET operations

There have never been any real users of MEMSET operations since they
have been introduced in January 2007 by commit 7405f74badf4 ("dmaengine:
refactor dmaengine around dma_async_tx_descriptor").  Therefore remove
support for them for now, it can be always brought back when needed.

[sebastian.hesselbarth@gmail.com: fix drivers/dma/mv_xor]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Acked-by: Dan Williams <djbw@fb.com>
Cc: Tomasz Figa <t.figa@samsung.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Olof Johansson <olof@lixom.net>
Cc: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 0 insertions, 94 deletions

diff --git a/crypto/async_tx/Kconfig b/crypto/async_tx/Kconfig
index 1b11abb..f38a58a 100644
--- a/crypto/async_tx/Kconfig
+++ b/crypto/async_tx/Kconfig
@@ -10,10 +10,6 @@ config ASYNC_XOR
 	select ASYNC_CORE
 	select XOR_BLOCKS
 
-config ASYNC_MEMSET
-	tristate
-	select ASYNC_CORE
-
 config ASYNC_PQ
 	tristate
 	select ASYNC_CORE
diff --git a/crypto/async_tx/Makefile b/crypto/async_tx/Makefile
index d1e0e6f..462e4ab 100644
--- a/crypto/async_tx/Makefile
+++ b/crypto/async_tx/Makefile
@@ -1,6 +1,5 @@
 obj-$(CONFIG_ASYNC_CORE) += async_tx.o
 obj-$(CONFIG_ASYNC_MEMCPY) += async_memcpy.o
-obj-$(CONFIG_ASYNC_MEMSET) += async_memset.o
 obj-$(CONFIG_ASYNC_XOR) += async_xor.o
 obj-$(CONFIG_ASYNC_PQ) += async_pq.o
 obj-$(CONFIG_ASYNC_RAID6_RECOV) += async_raid6_recov.o
diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c
deleted file mode 100644
index 05a4d1e..0000000
--- a/crypto/async_tx/async_memset.c
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- * memory fill offload engine support
- *
- * Copyright © 2006, Intel Corporation.
- *
- *      Dan Williams <dan.j.williams@intel.com>
- *
- *      with architecture considerations by:
- *      Neil Brown <neilb@suse.de>
- *      Jeff Garzik <jeff@garzik.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- *
- */
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/mm.h>
-#include <linux/dma-mapping.h>
-#include <linux/async_tx.h>
-
-/**
- * async_memset - attempt to fill memory with a dma engine.
- * @dest: destination page
- * @val: fill value
- * @offset: offset in pages to start transaction
- * @len: length in bytes
- *
- * honored flags: ASYNC_TX_ACK
- */
-struct dma_async_tx_descriptor *
-async_memset(struct page *dest, int val, unsigned int offset, size_t len,
-	     struct async_submit_ctl *submit)
-{
-	struct dma_chan *chan = async_tx_find_channel(submit, DMA_MEMSET,
-						      &dest, 1, NULL, 0, len);
-	struct dma_device *device = chan ? chan->device : NULL;
-	struct dma_async_tx_descriptor *tx = NULL;
-
-	if (device && is_dma_fill_aligned(device, offset, 0, len)) {
-		dma_addr_t dma_dest;
-		unsigned long dma_prep_flags = 0;
-
-		if (submit->cb_fn)
-			dma_prep_flags |= DMA_PREP_INTERRUPT;
-		if (submit->flags & ASYNC_TX_FENCE)
-			dma_prep_flags |= DMA_PREP_FENCE;
-		dma_dest = dma_map_page(device->dev, dest, offset, len,
-					DMA_FROM_DEVICE);
-
-		tx = device->device_prep_dma_memset(chan, dma_dest, val, len,
-						    dma_prep_flags);
-	}
-
-	if (tx) {
-		pr_debug("%s: (async) len: %zu\n", __func__, len);
-		async_tx_submit(chan, tx, submit);
-	} else { /* run the memset synchronously */
-		void *dest_buf;
-		pr_debug("%s: (sync) len: %zu\n", __func__, len);
-
-		dest_buf = page_address(dest) + offset;
-
-		/* wait for any prerequisite operations */
-		async_tx_quiesce(&submit->depend_tx);
-
-		memset(dest_buf, val, len);
-
-		async_tx_sync_epilog(submit);
-	}
-
-	return tx;
-}
-EXPORT_SYMBOL_GPL(async_memset);
-
-MODULE_AUTHOR("Intel Corporation");
-MODULE_DESCRIPTION("asynchronous memset api");
-MODULE_LICENSE("GPL");