Re: RFC: turn scatterlist into a linked list, eliminate bio_vec

[David S. Miller]

   From: "Adam J. Richter" <[e-mail]>
   Date: Sun, 23 Jun 2002 16:58:20 -0700

   	/* Let's assume the new pci_map_sg will free unused scatterlists. */
   	while (sg != NULL && count--) {
   		sg->driver_priv = mempool_alloc(q->sgpriv_pool, GFP_KERNEL);
   
   		sg->driver_priv_dma =
   			pci_map_single(req->dma_map_dev, sg->driver_priv, len,
   				       PCI_DMA_TODEVICE);
   			if (sg_dma->dma_add_priv == 0);
   				failed = fail_value;
   		}
   	}

Driver descriptors are not supposed to be done using pci_map_*()
and friends.  You are supposed to use consistent DMA memory for
this purpose.  Please read DMA-mapping.txt a few more times Adam :-)

Also, this while loop never terminates :-)