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| author | Dan Williams <dan.j.williams@intel.com> | 2009-09-08 17:53:04 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-09-08 17:53:04 -0700 |
| commit | 0803172778901e24a75ab074798d98c2b7411559 (patch) | |
| tree | a3e1d0cf4228d65dc1fac2ad56f3beb6b6f3474b | |
| parent | 1979b186b80449ac6574d97c254b694c8a99b703 (diff) | |
| download | linux-0803172778901e24a75ab074798d98c2b7411559.tar.bz2 | |
dmaengine: kill tx_list
The tx_list attribute of struct dma_async_tx_descriptor is common to
most, but not all dma driver implementations. None of the upper level
code (dmaengine/async_tx) uses it, so allow drivers to implement it
locally if they need it. This saves sizeof(struct list_head) bytes for
drivers that do not manage descriptors with a linked list (e.g.: ioatdma
v2,3).
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
| -rw-r--r-- | drivers/dma/dmaengine.c | 1 | ||||
| -rw-r--r-- | include/linux/dmaengine.h | 3 |
2 files changed, 0 insertions, 4 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 5a87384ea4ff..562d182eae66 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -933,7 +933,6 @@ void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx, { tx->chan = chan; spin_lock_init(&tx->lock); - INIT_LIST_HEAD(&tx->tx_list); } EXPORT_SYMBOL(dma_async_tx_descriptor_init); diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index ffefba81c818..f114bc7790bc 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -180,8 +180,6 @@ typedef void (*dma_async_tx_callback)(void *dma_async_param); * @flags: flags to augment operation preparation, control completion, and * communicate status * @phys: physical address of the descriptor - * @tx_list: driver common field for operations that require multiple - * descriptors * @chan: target channel for this operation * @tx_submit: set the prepared descriptor(s) to be executed by the engine * @callback: routine to call after this operation is complete @@ -195,7 +193,6 @@ struct dma_async_tx_descriptor { dma_cookie_t cookie; enum dma_ctrl_flags flags; /* not a 'long' to pack with cookie */ dma_addr_t phys; - struct list_head tx_list; struct dma_chan *chan; dma_cookie_t (*tx_submit)(struct dma_async_tx_descriptor *tx); dma_async_tx_callback callback; |