[BUG] znet.c sleeping function called from invalid context

[Alexander Strakh]

	KERNEL_VERSION: 2.6.31
	DESCRIBE:
Driver drivers/net/znet.c might sleep in atomic context, because it calls 
free_dma under claim_dma_lock:

.drivers/net/znet.c:
 168 static int znet_request_resources (struct net_device *dev)
...
 189        flags = claim_dma_lock();
 190        free_dma (znet->tx_dma);
 191        release_dma_lock (flags);
...

Path to might_sleep macro from znet_request_resources:
1. znet_request_resources calls free_dma at 
arch/blackfin/kernel/bfin_dma_5xx.c:181
2. free_dma calls arch/blackfin/kernel/bfin_dma_5xx.c:195

Found by: Linux Driver Verification

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