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authorDan Williams <dan.j.williams@intel.com>2010-05-18 03:24:16 +0400
committerDan Williams <dan.j.williams@intel.com>2010-05-18 03:24:16 +0400
commitcaa20d974c86af496b419eef70010e63b7fab7ac (patch)
treea38165bd839a398528a4ef4c7fa8481fb0fefed3 /drivers/dma
parentc86e1401c9f2ba8d989fa1c4b33d0f0ec3ba8aaf (diff)
downloadlinux-caa20d974c86af496b419eef70010e63b7fab7ac.tar.xz
async_tx: trim dma_async_tx_descriptor in 'no channel switch' case
Saves 24 bytes per descriptor (64-bit) when the channel-switching capabilities of async_tx are not required. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dmaengine.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index d18b5d069d7e..fcfe1a62ffa5 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -978,7 +978,9 @@ void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
struct dma_chan *chan)
{
tx->chan = chan;
+ #ifndef CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH
spin_lock_init(&tx->lock);
+ #endif
}
EXPORT_SYMBOL(dma_async_tx_descriptor_init);
@@ -1011,7 +1013,7 @@ EXPORT_SYMBOL_GPL(dma_wait_for_async_tx);
*/
void dma_run_dependencies(struct dma_async_tx_descriptor *tx)
{
- struct dma_async_tx_descriptor *dep = tx->next;
+ struct dma_async_tx_descriptor *dep = txd_next(tx);
struct dma_async_tx_descriptor *dep_next;
struct dma_chan *chan;
@@ -1019,7 +1021,7 @@ void dma_run_dependencies(struct dma_async_tx_descriptor *tx)
return;
/* we'll submit tx->next now, so clear the link */
- tx->next = NULL;
+ txd_clear_next(tx);
chan = dep->chan;
/* keep submitting up until a channel switch is detected
@@ -1027,14 +1029,14 @@ void dma_run_dependencies(struct dma_async_tx_descriptor *tx)
* processing the interrupt from async_tx_channel_switch
*/
for (; dep; dep = dep_next) {
- spin_lock_bh(&dep->lock);
- dep->parent = NULL;
- dep_next = dep->next;
+ txd_lock(dep);
+ txd_clear_parent(dep);
+ dep_next = txd_next(dep);
if (dep_next && dep_next->chan == chan)
- dep->next = NULL; /* ->next will be submitted */
+ txd_clear_next(dep); /* ->next will be submitted */
else
dep_next = NULL; /* submit current dep and terminate */
- spin_unlock_bh(&dep->lock);
+ txd_unlock(dep);
dep->tx_submit(dep);
}