Hello all
On Fri, Feb 13, 2015 at 4:32 PM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote:
> Yes please. And if Ricardo is correct, then someone (janitor job?) should do
> a review of dma_unmap_sg in particular.
Perhaps a code snippet inside scatterlist.h will clarify even more.
Would any of the maintainers accept a patch to include a comment like:
struct sg_table *sgt;
sgt = kzalloc(sizeof(*sgt);
if (!sgt){
return -ENOMEM;
}
ret = sg_alloc_table(sgt, N_NENTS, GPF_KERNEL);
if (ret){
kfree(sgt);
return ret;
}
//Fill sgt using orig_nents or nents as index
sgt->nents = dma_map_sg(dev, sgt->sgl, sgt->orig_nents, DIR);
if (!sgt->nents){
sg_free_table(sgt);
kfree(sgt);
return -EIO;
}
//Use nent as index
dma_unmap_sg(dev, sgt->sgl, sgt->orig_nents, DIR);
sg_free_table(sgt);
kfree(sgt);
return 0
Thanks!
--
Ricardo Ribalda
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