Commit 6b314196 authored Sep 19, 2008 by Timur Tabi Committed by Dan Williams Sep 19, 2008

dmatest: properly handle duplicate DMA channels



Update the the dmatest driver so that it handles duplicate DMA channels
properly.

When a DMA client is notified of an available DMA channel, it must check if it
has already allocated resources for that channel.  If so, it should return
DMA_DUP.  This can happen, for example, if a DMA driver calls
dma_async_device_register() more than once.

Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

parent 89f72a06

drivers/dma/dmatest.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -325,6 +325,11 @@ static enum dma_state_client dmatest_add_channel(struct dma_chan *chan)
		struct dmatest_thread *thread;
		unsigned int i;

		/* Have we already been told about this channel? */
		list_for_each_entry(dtc, &dmatest_channels, node)
		if (dtc->chan == chan)
		return DMA_DUP;

		dtc = kmalloc(sizeof(struct dmatest_chan), GFP_ATOMIC);
		if (!dtc) {
		pr_warning("dmatest: No memory for %s\n", chan->dev.bus_id);

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