dmaengine, async_tx: add a "no channel switch" allocator

[safe/jmp/linux-2.6] / crypto / async_tx / async_tx.c

diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c
index 60615fe..f9cdf04 100644 (file)
--- a/crypto/async_tx/async_tx.c
+++ b/crypto/async_tx/async_tx.c
@@ -81,6 +81,10 @@ async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx,
        struct dma_device *device = chan->device;
        struct dma_async_tx_descriptor *intr_tx = (void *) ~0;
 
+       #ifdef CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH
+       BUG();
+       #endif
+
        /* first check to see if we can still append to depend_tx */
        spin_lock_bh(&depend_tx->lock);
        if (depend_tx->parent && depend_tx->chan == tx->chan) {