Have you tried the manual page http://man.openbsd.org/bus_dma.9 ?

On Thu, Oct 13, 2016 at 12:39 AM, <co...@sdf.org> wrote:

> On Wed, Oct 12, 2016 at 04:26:20PM -0400, Joe Nosay wrote:
> > Where in the code is the problem?
> >
> > On Tue, Oct 11, 2016 at 11:49 PM, <co...@sdf.org> wrote:
> >
>
> 836     vd = malloc(sizeof(struct vdsk_dring), M_DEVBUF, M_NOWAIT);
> 837     if (vd == NULL)
> 838             return NULL;
> 839
>
> assuming this suceeds...
>
> 840     size = roundup(nentries * sizeof(struct vd_desc), PAGE_SIZE);
> 841
> 842     if (bus_dmamap_create(t, size, 1, size, 0,
> 843         BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &vd->vd_map) != 0)
> 844             return (NULL);
>
> but this fails.
>
> Now we return NULL, due to failure. but there's no reference to vd
> which will allow us to free it later.
>
> (I may be misunderstanding what bus_dmamap_create does, but probably not.
>

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