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SubjectRe: [RFC][PATCH 2/5 v2] dma-buf: heaps: Add heap helpers
Date
Hi John,

On Tue, Mar 05, 2019 at 12:54:30PM -0800, John Stultz wrote:

...

> +
> +void dma_heap_buffer_destroy(struct dma_heap_buffer *heap_buffer)
> +{
> + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer);
> +
> + if (buffer->kmap_cnt > 0) {
> + pr_warn_once("%s: buffer still mapped in the kernel\n",
> + __func__);

Could be worth something louder like a full WARN.

> + vunmap(buffer->vaddr);
> + }
> +
> + buffer->free(buffer);
> +}
> +

...

> +
> +static void *dma_heap_dma_buf_kmap(struct dma_buf *dmabuf,
> + unsigned long offset)
> +{
> + struct dma_heap_buffer *heap_buffer = dmabuf->priv;
> + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer);
> +
> + return buffer->vaddr + offset * PAGE_SIZE;

I think it'd be good to check for NULL vaddr and return NULL in that
case. Less chance of an invalid pointer being accidentally used then.

Thanks,
-Brian

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