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authorDan Williams <dan.j.williams@intel.com>2007-07-09 20:56:42 +0200
committerDan Williams <dan.j.williams@intel.com>2007-07-13 17:06:13 +0200
commitd379b01e9087a582d58f4b678208a4f8d8376fe7 (patch)
tree155920bca93c18afba66b9d5acfecd359d5bec65 /drivers/dma/ioatdma.c
parentdmaengine: refactor dmaengine around dma_async_tx_descriptor (diff)
downloadlinux-d379b01e9087a582d58f4b678208a4f8d8376fe7.tar.xz
linux-d379b01e9087a582d58f4b678208a4f8d8376fe7.zip
dmaengine: make clients responsible for managing channels
The current implementation assumes that a channel will only be used by one client at a time. In order to enable channel sharing the dmaengine core is changed to a model where clients subscribe to channel-available-events. Instead of tracking how many channels a client wants and how many it has received the core just broadcasts the available channels and lets the clients optionally take a reference. The core learns about the clients' needs at dma_event_callback time. In support of multiple operation types, clients can specify a capability mask to only be notified of channels that satisfy a certain set of capabilities. Changelog: * removed DMA_TX_ARRAY_INIT, no longer needed * dma_client_chan_free -> dma_chan_release: switch to global reference counting only at device unregistration time, before it was also happening at client unregistration time * clients now return dma_state_client to dmaengine (ack, dup, nak) * checkpatch.pl fixes * fixup merge with git-ioat Cc: Chris Leech <christopher.leech@intel.com> Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/dma/ioatdma.c')
-rw-r--r--drivers/dma/ioatdma.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/dma/ioatdma.c b/drivers/dma/ioatdma.c
index 171044930282..81810b3042f1 100644
--- a/drivers/dma/ioatdma.c
+++ b/drivers/dma/ioatdma.c
@@ -72,7 +72,6 @@ static int enumerate_dma_channels(struct ioat_device *device)
INIT_LIST_HEAD(&ioat_chan->used_desc);
/* This should be made common somewhere in dmaengine.c */
ioat_chan->common.device = &device->common;
- ioat_chan->common.client = NULL;
list_add_tail(&ioat_chan->common.device_node,
&device->common.channels);
}