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dma-proxy: SG list needs to be mapped before use with DMA driver #17

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dma-proxy: SG list needs to be mapped before use with DMA driver #17

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15 changes: 10 additions & 5 deletions linux-user-space-dma/Software/Kernel/dma-proxy.c
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Original file line number Diff line number Diff line change
Expand Up @@ -194,11 +194,16 @@ static void start_transfer(struct dma_proxy_channel *pchannel_p)
/* A single entry scatter gather list is used as it's not clear how to do it with a simpler method.
* Get a descriptor for the transfer ready to submit
*/
sg_init_one(
&pchannel_p->bdtable[bdindex].sglist,
(void*)pchannel_p->bdtable[bdindex].dma_handle,
pchannel_p->buffer_table_p[bdindex].length
);
sg_init_one(&pchannel_p->bdtable[bdindex].sglist,
(void*)pchannel_p->bdtable[baindex].dma_handle,
pchannel_p->buffer_table_p[bdindex].length);

n = dma_map_sg(dma_device->dev, &pchannel_p->bdtable[bdindex].sglist,
1, DMA_FROM_DEVICE);
if (n != 1) {
printk(KERN_ERR "DMA mapping failed\n");
return;
}

chan_desc = dma_device->device_prep_slave_sg(pchannel_p->channel_p, &pchannel_p->bdtable[bdindex].sglist, 1,
pchannel_p->direction, flags, NULL);
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