The called netif_rx_schedule() does all the work for us:
- it checks the return value of netif_rx_schedule_prep() and
- if everything is ok calls __netif_rx_schedule().
Before this change, the driver received absolutely nothing.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
---
--- a/drivers/net/korina.c	2009-01-19 23:26:19.000000000 +0100
+++ b/drivers/net/korina.c	2009-01-19 23:27:06.000000000 +0100
@@ -330,7 +330,7 @@
 
 	dmas = readl(&lp->rx_dma_regs->dmas);
 	if (dmas & (DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR)) {
-		netif_rx_schedule_prep(dev, &lp->napi);
+		netif_rx_schedule(dev, &lp->napi);
 
 		dmasm = readl(&lp->rx_dma_regs->dmasm);
 		writel(dmasm | (DMA_STAT_DONE |
