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Commit 3f0fb4e8 authored by Michal Miroslaw's avatar Michal Miroslaw Committed by Linus Torvalds
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Documentation/DMA-API-HOWTO.txt: fix misleading example 



See: DMA-API.txt, part Id, DMA_FROM_DEVICE description.

Signed-off-by: default avatarMichal Miroslaw <mirq-linux@rere.qmqm.pl>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 91f6cdf8

Documentation/DMA-API-HOWTO.txt

+6 −6
Original line number Diff line number Diff line
@@ -613,13 +613,13 @@ to use the dma_sync_*() interfaces. 
				pass_to_upper_layers(cp->rx_buf);

				make_and_setup_new_rx_buf(cp);

			} else {

				/* Just sync the buffer and give it back

				 * to the card.

				/* CPU should not write to

				 * DMA_FROM_DEVICE-mapped area,

				 * so dma_sync_single_for_device() is

				 * not needed here. It would be required

				 * for DMA_BIDIRECTIONAL mapping if

				 * the memory was modified.

				 */

				dma_sync_single_for_device(&cp->dev,

							   cp->rx_dma,

							   cp->rx_len,

							   DMA_FROM_DEVICE);

				give_rx_buf_to_card(cp);

			}

		}