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authorDan Williams <dan.j.williams@intel.com>2010-10-07 16:44:50 -0700
committerDan Williams <dan.j.williams@intel.com>2010-10-07 17:08:32 -0700
commit5fc6d897fde352bad5db5767e7260741a8cdd9e9 (patch)
treecb918dd33b8288aadead08b04b9f308f9d8bcbd1 /drivers/dma/dmaengine.c
parent400fb7f6a0cfe13025cb0296fdb4737da7025a8a (diff)
downloadlinux-5fc6d897fde352bad5db5767e7260741a8cdd9e9.tar.bz2
async_tx: make async_tx channel switching opt-in
The majority of drivers in drivers/dma/ will never establish cross channel operation chains and do not need the extra overhead in struct dma_async_tx_descriptor. Make channel switching opt-in by default. Cc: Anatolij Gustschin <agust@denx.de> Cc: Ira Snyder <iws@ovro.caltech.edu> Cc: Linus Walleij <linus.walleij@stericsson.com> Cc: Saeed Bishara <saeed@marvell.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/dmaengine.c')
-rw-r--r--drivers/dma/dmaengine.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 235153cd7ac5..8bcb15fb959d 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -706,7 +706,7 @@ int dma_async_device_register(struct dma_device *device)
BUG_ON(!device->dev);
/* note: this only matters in the
- * CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH=y case
+ * CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH=n case
*/
if (device_has_all_tx_types(device))
dma_cap_set(DMA_ASYNC_TX, device->cap_mask);
@@ -980,7 +980,7 @@ 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
+ #ifdef CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH
spin_lock_init(&tx->lock);
#endif
}