linux-kernel - [PATCH 12/19] dmaengine: dma_async_memcpy_err for DMA engines that do not support memcpy

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Date:	Mon, 11 Sep 2006 16:18:39 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	neilb@...e.de, linux-raid@...r.kernel.org
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org,
	christopher.leech@...el.com
Subject: [PATCH 12/19] dmaengine: dma_async_memcpy_err for DMA engines that do not support memcpy

From: Dan Williams <dan.j.williams@...el.com>

Default virtual function that returns an error if the user attempts a
memcpy operation.  An XOR engine is an example of a DMA engine that does
not support memcpy.

Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---

 drivers/dma/dmaengine.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index fe62237..33ad690 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -593,6 +593,18 @@ void dma_async_device_unregister(struct 
 }
 
 /**
+ * dma_async_do_memcpy_err - default function for dma devices that
+ *	do not support memcpy
+ */
+dma_cookie_t dma_async_do_memcpy_err(struct dma_chan *chan,
+		union dmaengine_addr dest, unsigned int dest_off,
+		union dmaengine_addr src, unsigned int src_off,
+                size_t len, unsigned long flags)
+{
+	return -ENXIO;
+}
+
+/**
  * dma_async_do_xor_err - default function for dma devices that
  *	do not support xor
  */
@@ -642,6 +654,7 @@ EXPORT_SYMBOL_GPL(dma_async_issue_pendin
 EXPORT_SYMBOL_GPL(dma_async_device_register);
 EXPORT_SYMBOL_GPL(dma_async_device_unregister);
 EXPORT_SYMBOL_GPL(dma_chan_cleanup);
+EXPORT_SYMBOL_GPL(dma_async_do_memcpy_err);
 EXPORT_SYMBOL_GPL(dma_async_do_xor_err);
 EXPORT_SYMBOL_GPL(dma_async_do_memset_err);
 EXPORT_SYMBOL_GPL(dma_async_chan_init);
-
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