From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Williams Subject: [PATCH 12/19] dmaengine: dma_async_memcpy_err for DMA engines that do not support memcpy Date: Mon, 11 Sep 2006 16:18:39 -0700 Message-ID: <20060911231838.4737.6812.stgit@dwillia2-linux.ch.intel.com> References: <1158015632.4241.31.camel@dwillia2-linux.ch.intel.com> Content-Type: text/plain; charset=utf-8; format=fixed Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <1158015632.4241.31.camel@dwillia2-linux.ch.intel.com> Sender: linux-raid-owner@vger.kernel.org To: neilb@suse.de, linux-raid@vger.kernel.org Cc: akpm@osdl.org, linux-kernel@vger.kernel.org, christopher.leech@intel.com List-Id: linux-raid.ids From: Dan Williams 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 --- 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);