The patch titled
dmatest: properly handle duplicate DMA channels
has been added to the -mm tree. Its filename is
dmatest-properly-handle-duplicate-dma-channels.patch
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See http://userweb.kernel.org/~akpm/added-to-mm.txt to find
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
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Subject: dmatest: properly handle duplicate DMA channels
From: Timur Tabi <timur@xxxxxxxxxxxxx>
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.
Signed-off-by: Timur Tabi <timur@xxxxxxxxxxxxx>
Cc: "Williams, Dan J" <dan.j.williams@xxxxxxxxx>
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/dma/dmatest.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN drivers/dma/dmatest.c~dmatest-properly-handle-duplicate-dma-channels drivers/dma/dmatest.c
--- a/drivers/dma/dmatest.c~dmatest-properly-handle-duplicate-dma-channels
+++ a/drivers/dma/dmatest.c
@@ -321,10 +321,15 @@ static void dmatest_cleanup_channel(stru
static enum dma_state_client dmatest_add_channel(struct dma_chan *chan)
{
- struct dmatest_chan *dtc;
+ struct dmatest_chan *dtc, *_dtc;
struct dmatest_thread *thread;
unsigned int i;
+ /* Have we already been told about this channel? */
+ list_for_each_entry_safe(dtc, _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);
_
Patches currently in -mm which might be from timur@xxxxxxxxxxxxx are
linux-next.patch
dmatest-properly-handle-duplicate-dma-channels.patch
drivers-dma-dmatestc-switch-a-gfp_atomic-to-gfp_kernel.patch
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