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;
> assuming this suceeds...
> 840 size = roundup(nentries * sizeof(struct vd_desc), PAGE_SIZE);
> 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.